Abstract

Monolayer MoS2 is considered to be one of the best candidates for next generation electronics because of its ultra-thin body and direct band gap. However, MoS2 based transistors have relatively low photoresponsivity, field effect mobility and narrow response spectrum range, which hinder the application of MoS2 in optoelectronic devices. Here, based on the enhancement of localized surface plasmon resonance (LSPR), a simple method of depositing Ag nanoparticles on the MoS2 surface is used. By adjusting the size of Ag nanoparticles, the response spectral range of phototransistor is broadened from red to near ultra-violet. The photoresponsivity gains an increase of 470% up to 2.97 × 104 A W−1 at 610 nm, and the response time also shows a decrease to some extent. The enhanced responsivity is comparable to those of devices encapsulated with high-quality dielectrics, and superior over other reported monolayer MoS2 in ambient conditions. The high responsivity and working current enables a wide range of device applications. This work provides a viable route towards performance enhancement of two-dimensional phototransistors.

© 2017 Optical Society of America

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2017 (3)

Y. Chen, L. Gan, H. Li, Y. Ma, and T. Zhai, “Achieving uniform monolayer transition metal dichalcogenides film on silicon wafer via silanization treatment: a typical study on WS2,” Adv. Mater. 29(7), 163550 (2017).
[Crossref] [PubMed]

C. Hu, D. Dong, X. Yang, K. Qiao, D. Yang, H. Deng, S. Yuan, J. Khan, Y. Lan, H. Song, and J. Tang, “Synergistic Effect of Hybrid PbS Quantum Dots/2D-WSe2 Toward High Performance and Broadband Phototransistors,” Adv. Funct. Mater. 27(2), 1603605 (2017).
[Crossref]

N. Zhou, B. Xu, L. Gan, J. Zhang, J. Han, and T. Zhai, “Narrowband spectrally selective near-infrared photodetector based on up-conversion nanoparticles used in a 2D hybrid device,” J. Mater. Chem. C Mater. Opt. Electron. Devices 5(7), 1591–1595 (2017).
[Crossref]

2016 (2)

Y. Huang, W. Zheng, Y. Qiu, and P. Hu, “The effrcts of organic molecules with different structures and absorption bandwidth on modulating photoresponse of MoS2 photodetectors,” ACS Appl. Mater. Interfaces 8(35), 23362–23370 (2016).
[Crossref] [PubMed]

L. Chen, F. Xue, X. Li, X. Huang, L. Wang, J. Kou, and Z. L. Wang, “Strain-gated field effect transistor of a MoS2-ZnO 2D-1D Hybrid Structure,” ACS Nano 10(1), 1546–1551 (2016).
[Crossref] [PubMed]

2015 (14)

X. Wang, P. Wang, J. Wang, W. Hu, X. Zhou, N. Guo, H. Huang, S. Sun, H. Shen, T. Lin, M. Tang, L. Liao, A. Jiang, J. Sun, X. Meng, X. Chen, W. Lu, and J. Chu, “Ultrasensitive and broadband MoS2 photodetector driven by ferroelectrics,” Adv. Mater. 27(42), 6575–6581 (2015).
[Crossref] [PubMed]

D. Kufer and G. Konstantatos, “Highly Sensitive, Encapsulated MoS2 Photodetector with Gate Controllable Gain and Speed,” Nano Lett. 15(11), 7307–7313 (2015).
[Crossref] [PubMed]

D. Lembke, S. Bertolazzi, and A. Kis, “Single-layer MoS2 electronics,” Acc. Chem. Res. 48(1), 100–110 (2015).
[Crossref] [PubMed]

J. Miao, W. Hu, Y. Jing, W. Luo, L. Liao, A. Pan, S. Wu, J. Cheng, X. Chen, and W. Lu, “Surface Plasmon-Enhanced Photodetection in Few Layer MoS2 Phototransistors with Au Nanostructure Arrays,” Small 11(20), 2392–2398 (2015).
[Crossref] [PubMed]

H. Fang, Z. Lin, X. Wang, C. Y. Tang, Y. Chen, F. Zhang, Y. Chai, Q. Li, Q. Yan, H. L. W. Chan, and J. Y. Dai, “Infrared light gated MoS2 field effect transistor,” Opt. Express 23(25), 31908–31914 (2015).
[Crossref] [PubMed]

C. Chen, H. Qiao, S. Lin, C. Man Luk, Y. Liu, Z. Xu, J. Song, Y. Xue, D. Li, J. Yuan, W. Yu, C. Pan, S. Ping Lau, and Q. Bao, “Highly responsive MoS2 photodetectors enhanced by graphene quantum dots,” Sci. Rep. 5(1), 11830 (2015).
[Crossref] [PubMed]

Z. Zheng, L. Gan, H. Li, Y. Ma, Y. Bando, D. Golberg, and T. Zhai, “A fully transparent and flexible ultraviolet-visible photodetector based on controlled electrospun ZnO-CdO heterojunction nanofiber arrays,” Adv. Funct. Mater. 25(37), 5885–5894 (2015).
[Crossref]

F. Schwierz, J. Pezoldt, and R. Granzner, “Two-dimensional materials and their prospects in transistor electronics,” Nanoscale 7(18), 8261–8283 (2015).
[Crossref] [PubMed]

W. Wang, A. Klots, D. Prasai, Y. Yang, K. I. Bolotin, and J. Valentine, “Hot Electron-Based Near-Infrared Photodetection Using Bilayer MoS2.,” Nano Lett. 15(11), 7440–7444 (2015).
[Crossref] [PubMed]

Q. Ji, M. Kan, Y. Zhang, Y. Guo, D. Ma, J. Shi, Q. Sun, Q. Chen, Y. Zhang, and Z. Liu, “Unravelling orientation distribution and merging behavior of monolayer MoS2 domains on sapphire,” Nano Lett. 15(1), 198–205 (2015).
[Crossref] [PubMed]

J. Hong, Z. Hu, M. Probert, K. Li, D. Lv, X. Yang, L. Gu, N. Mao, Q. Feng, L. Xie, J. Zhang, D. Wu, Z. Zhang, C. Jin, W. Ji, X. Zhang, J. Yuan, and Z. Zhang, “Exploring atomic defects in molybdenum disulphide monolayers,” Nat. Commun. 6, 6293 (2015).
[Crossref] [PubMed]

H. S. Lee, M. S. Kim, Y. Jin, G. H. Han, Y. H. Lee, and J. Kim, “Efficient exciton-plasmon conversion in Ag nanowire/monolayer MoS2Hybrids: direct imaging and quantitative estimation of plasmon coupling and propagation,” Adv. Opt. Mater. 3(7), 943–947 (2015).
[Crossref]

J. H. Kim, J. Lee, J. H. Kim, C. C. Hwang, C. Lee, and J. Y. Park, “Work function variation of MoS2 atomic layers grown with chemical vapor deposition: The effects of thickness and the adsorption of water/oxygen molecules,” Appl. Phys. Lett. 106(25), 251606 (2015).
[Crossref]

K. C. Lee, Y. H. Chen, H. Y. Lin, C. C. Cheng, P. Y. Chen, T. Y. Wu, M. H. Shih, K. H. Wei, L. J. Li, and C. W. Chang, “Plasmonic gold nanorods coverage influence on enhancement of the photoluminescence of two-dimensional MoS2 monolayer,” Sci. Rep. 5(1), 16374 (2015).
[Crossref] [PubMed]

2014 (15)

Y. Kang, S. Najmaei, Z. Liu, Y. Bao, Y. Wang, X. Zhu, N. J. Halas, P. Nordlander, P. M. Ajayan, J. Lou, and Z. Fang, “Plasmonic hot electron induced structural phase transition in a MoS2 monolayer,” Adv. Mater. 26(37), 6467–6471 (2014).
[Crossref] [PubMed]

A. Sobhani, A. Lauchner, S. Najmaei, C. Ayala-Orozco, F. Wen, J. Lou, and N. J. Halas, “Enhancing the photocurrent and photoluminescence of single crystal monolayer MoS2 with resonant plasmonic nanoshells,” Appl. Phys. Lett. 104(3), 031112 (2014).
[Crossref]

M. E. Ayhan, G. Kalita, M. Kondo, and M. Tanemura, “Photoresponsivity of silver nanoparticles decorated graphene–silicon Schottky junction,” Rsc Adv. 4(51), 26866 (2014).
[Crossref]

S. Choi, Z. Shaolin, and W. Yang, “Layer-number-dependent work function of MoS2 nanoflakes,” J. Korean Phys. Soc. 64(10), 1550–1555 (2014).
[Crossref]

X. Ling, Y. H. Lee, Y. Lin, W. Fang, L. Yu, M. S. Dresselhaus, and J. Kong, “Role of the seeding promoter in MoS2 growth by chemical vapor deposition,” Nano Lett. 14(2), 464–472 (2014).
[Crossref] [PubMed]

S. H. Yu, Y. Lee, S. K. Jang, J. Kang, J. Jeon, C. Lee, J. Y. Lee, H. Kim, E. Hwang, S. Lee, and J. H. Cho, “Dye-sensitized MoS2 photodetector with enhanced spectral photoresponse,” ACS Nano 8(8), 8285–8291 (2014).
[Crossref] [PubMed]

L. B. Luo, L. H. Zeng, C. Xie, Y. Q. Yu, F. X. Liang, C. Y. Wu, L. Wang, and J. G. Hu, “Light trapping and surface plasmon enhanced high-performance NIR photodetector,” Sci. Rep. 4(1), 3914 (2014).
[Crossref] [PubMed]

Y. N. Ma, J. Zhou, L. Shu, T. H. Li, L. Petti, and P. Mormile, “Optimizing Au/Ag core-shell nanorods: purification, stability, and surface modification,” J. Nanopart. Res. 16(6), 2439 (2014).
[Crossref]

Y. Ma, J. Zhou, W. Zou, Z. Jia, L. Petti, and P. Mormile, “Localized surface plasmon resonance and surface enhanced Raman scattering responses of Au@Ag core-shell nanorods with different thickness of Ag shell,” J. Nanosci. Nanotechnol. 14(6), 4245–4250 (2014).
[Crossref] [PubMed]

Z. Sun and H. Chang, “Graphene and graphene-like two-dimensional materials in photodetection: mechanisms and methodology,” ACS Nano 8(5), 4133–4156 (2014).
[Crossref] [PubMed]

Y. Liu, X. Zhang, J. Su, H. Li, Q. Zhang, and Y. Gao, “Ag nanoparticles@ZnO nanowire composite arrays: an absorption enhanced UV photodetector,” Opt. Express 22(24), 30148–30155 (2014).
[Crossref] [PubMed]

F. H. Koppens, T. Mueller, P. Avouris, A. C. Ferrari, M. S. Vitiello, and M. Polini, “Photodetectors based on graphene, other two-dimensional materials and hybrid systems,” Nat. Nanotechnol. 9(10), 780–793 (2014).
[Crossref] [PubMed]

F. Xia, H. Wang, D. Xiao, M. Dubey, and A. Ramasubramaniam, “Two-dimensional material nanophotonics,” Nat. Photonics 8(12), 899–907 (2014).
[Crossref]

W. Zhang, M. H. Chiu, C. H. Chen, W. Chen, L. J. Li, and A. T. S. Wee, “Role of Metal Contacts in High-Performance Phototransistors Based on WSe2 Monolayers,” ACS Nano 8(8), 8653–8661 (2014).
[Crossref] [PubMed]

J. Xia, X. Huang, L. Z. Liu, M. Wang, L. Wang, B. Huang, D. D. Zhu, J. J. Li, C. Z. Gu, and X. M. Meng, “CVD synthesis of large-area, highly crystalline MoSe2 atomic layers on diverse substrates and application to photodetectors,” Nanoscale 6(15), 8949–8955 (2014).
[Crossref] [PubMed]

2013 (3)

W. Zhang, J. K. Huang, C. H. Chen, Y. H. Chang, Y. J. Cheng, and L. J. Li, “High-gain phototransistors based on a CVD MoS2 monolayer,” Adv. Mater. 25(25), 3456–3461 (2013).
[Crossref] [PubMed]

S. Najmaei, Z. Liu, W. Zhou, X. Zou, G. Shi, S. Lei, B. I. Yakobson, J. C. Idrobo, P. M. Ajayan, and J. Lou, “Vapour phase growth and grain boundary structure of molybdenum disulphide atomic layers,” Nat. Mater. 12(8), 754–759 (2013).
[Crossref] [PubMed]

J. Lin, H. Li, H. Zhang, and W. Chen, “Plasmonic enhancement of photocurrent in MoS2 field-effect-transistor,” Appl. Phys. Lett. 102(20), 203109 (2013).
[Crossref]

2012 (7)

Q. H. Wang, K. Kalantar-Zadeh, A. Kis, J. N. Coleman, and M. S. Strano, “Electronics and optoelectronics of two-dimensional transition metal dichalcogenides,” Nat. Nanotechnol. 7(11), 699–712 (2012).
[Crossref] [PubMed]

Y. H. Lee, X. Q. Zhang, W. Zhang, M. T. Chang, C. T. Lin, K. D. Chang, Y. C. Yu, J. T. Wang, C. S. Chang, L. J. Li, and T. W. Lin, “Synthesis of large-area MoS2 atomic layers with chemical vapor deposition,” Adv. Mater. 24(17), 2320–2325 (2012).
[Crossref] [PubMed]

W. Choi, M. Y. Cho, A. Konar, J. H. Lee, G. B. Cha, S. C. Hong, S. Kim, J. Kim, D. Jena, J. Joo, and S. Kim, “High-detectivity multilayer MoS(2) phototransistors with spectral response from ultraviolet to infrared,” Adv. Mater. 24(43), 5832–5836 (2012).
[Crossref] [PubMed]

A. M. Alkilany, L. B. Thompson, S. P. Boulos, P. N. Sisco, and C. J. Murphy, “Gold nanorods: their potential for photothermal therapeutics and drug delivery, tempered by the complexity of their biological interactions,” Adv. Drug Deliv. Rev. 64(2), 190–199 (2012).
[Crossref] [PubMed]

H. S. Lee, S. W. Min, Y. G. Chang, M. K. Park, T. Nam, H. Kim, J. H. Kim, S. Ryu, and S. Im, “MoS2 nanosheet phototransistors with thickness-modulated optical energy gap,” Nano Lett. 12(7), 3695–3700 (2012).
[Crossref] [PubMed]

H. Liu, A. T. Neal, and P. D. D. Ye, “Channel length scaling of MoS2 MOSFETs,” ACS Nano 6(10), 8563–8569 (2012).
[Crossref] [PubMed]

Z. Yin, H. Li, H. Li, L. Jiang, Y. Shi, Y. Sun, G. Lu, Q. Zhang, X. Chen, and H. Zhang, “Single-layer MoS2 phototransistors,” ACS Nano 6(1), 74–80 (2012).
[Crossref] [PubMed]

2011 (3)

B. Radisavljevic, A. Radenovic, J. Brivio, V. Giacometti, and A. Kis, “Single-layer MoS2 transistors,” Nat. Nanotechnol. 6(3), 147–150 (2011).
[Crossref] [PubMed]

Y. Liu, R. Cheng, L. Liao, H. Zhou, J. Bai, G. Liu, L. Liu, Y. Huang, and X. Duan, “Plasmon resonance enhanced multicolour photodetection by graphene,” Nat. Commun. 2, 579 (2011).
[Crossref] [PubMed]

S. Linic, P. Christopher, and D. B. Ingram, “Plasmonic-metal nanostructures for efficient conversion of solar to chemical energy,” Nat. Mater. 10(12), 911–921 (2011).
[Crossref] [PubMed]

2010 (2)

H. A. Atwater and A. Polman, “Plasmonics for improved photovoltaic devices,” Nat. Mater. 9(3), 205–213 (2010).
[Crossref] [PubMed]

C. Lee, H. Yan, L. E. Brus, T. F. Heinz, J. Hone, and S. Ryu, “Anomalous lattice vibrations of single- and few-layer MoS2.,” ACS Nano 4(5), 2695–2700 (2010).
[Crossref] [PubMed]

2009 (1)

P. Bharadwaj, B. Deutsch, and L. Novotny, “Optical Antennas,” Adv. Opt. Photonics 1(3), 438 (2009).
[Crossref]

2004 (1)

K. S. Novoselov, A. K. Geim, S. V. Morozov, D. Jiang, Y. Zhang, S. V. Dubonos, I. V. Grigorieva, and A. A. Firsov, “Electric field effect in atomically thin carbon films,” Science 306(5696), 666–669 (2004).
[Crossref] [PubMed]

2000 (1)

C. Wen, K. Ishikawa, M. Kishima, and K. Yamada, “Effects of silver particles on the photovoltaic properties of dye-sensitized TiO2 thin films,” Sol. Energy Mater. Sol. Cells 61(4), 339–351 (2000).
[Crossref]

Ajayan, P. M.

Y. Kang, S. Najmaei, Z. Liu, Y. Bao, Y. Wang, X. Zhu, N. J. Halas, P. Nordlander, P. M. Ajayan, J. Lou, and Z. Fang, “Plasmonic hot electron induced structural phase transition in a MoS2 monolayer,” Adv. Mater. 26(37), 6467–6471 (2014).
[Crossref] [PubMed]

S. Najmaei, Z. Liu, W. Zhou, X. Zou, G. Shi, S. Lei, B. I. Yakobson, J. C. Idrobo, P. M. Ajayan, and J. Lou, “Vapour phase growth and grain boundary structure of molybdenum disulphide atomic layers,” Nat. Mater. 12(8), 754–759 (2013).
[Crossref] [PubMed]

Alkilany, A. M.

A. M. Alkilany, L. B. Thompson, S. P. Boulos, P. N. Sisco, and C. J. Murphy, “Gold nanorods: their potential for photothermal therapeutics and drug delivery, tempered by the complexity of their biological interactions,” Adv. Drug Deliv. Rev. 64(2), 190–199 (2012).
[Crossref] [PubMed]

Atwater, H. A.

H. A. Atwater and A. Polman, “Plasmonics for improved photovoltaic devices,” Nat. Mater. 9(3), 205–213 (2010).
[Crossref] [PubMed]

Avouris, P.

F. H. Koppens, T. Mueller, P. Avouris, A. C. Ferrari, M. S. Vitiello, and M. Polini, “Photodetectors based on graphene, other two-dimensional materials and hybrid systems,” Nat. Nanotechnol. 9(10), 780–793 (2014).
[Crossref] [PubMed]

Ayala-Orozco, C.

A. Sobhani, A. Lauchner, S. Najmaei, C. Ayala-Orozco, F. Wen, J. Lou, and N. J. Halas, “Enhancing the photocurrent and photoluminescence of single crystal monolayer MoS2 with resonant plasmonic nanoshells,” Appl. Phys. Lett. 104(3), 031112 (2014).
[Crossref]

Ayhan, M. E.

M. E. Ayhan, G. Kalita, M. Kondo, and M. Tanemura, “Photoresponsivity of silver nanoparticles decorated graphene–silicon Schottky junction,” Rsc Adv. 4(51), 26866 (2014).
[Crossref]

Bai, J.

Y. Liu, R. Cheng, L. Liao, H. Zhou, J. Bai, G. Liu, L. Liu, Y. Huang, and X. Duan, “Plasmon resonance enhanced multicolour photodetection by graphene,” Nat. Commun. 2, 579 (2011).
[Crossref] [PubMed]

Bando, Y.

Z. Zheng, L. Gan, H. Li, Y. Ma, Y. Bando, D. Golberg, and T. Zhai, “A fully transparent and flexible ultraviolet-visible photodetector based on controlled electrospun ZnO-CdO heterojunction nanofiber arrays,” Adv. Funct. Mater. 25(37), 5885–5894 (2015).
[Crossref]

Bao, Q.

C. Chen, H. Qiao, S. Lin, C. Man Luk, Y. Liu, Z. Xu, J. Song, Y. Xue, D. Li, J. Yuan, W. Yu, C. Pan, S. Ping Lau, and Q. Bao, “Highly responsive MoS2 photodetectors enhanced by graphene quantum dots,” Sci. Rep. 5(1), 11830 (2015).
[Crossref] [PubMed]

Bao, Y.

Y. Kang, S. Najmaei, Z. Liu, Y. Bao, Y. Wang, X. Zhu, N. J. Halas, P. Nordlander, P. M. Ajayan, J. Lou, and Z. Fang, “Plasmonic hot electron induced structural phase transition in a MoS2 monolayer,” Adv. Mater. 26(37), 6467–6471 (2014).
[Crossref] [PubMed]

Bertolazzi, S.

D. Lembke, S. Bertolazzi, and A. Kis, “Single-layer MoS2 electronics,” Acc. Chem. Res. 48(1), 100–110 (2015).
[Crossref] [PubMed]

Bharadwaj, P.

P. Bharadwaj, B. Deutsch, and L. Novotny, “Optical Antennas,” Adv. Opt. Photonics 1(3), 438 (2009).
[Crossref]

Bolotin, K. I.

W. Wang, A. Klots, D. Prasai, Y. Yang, K. I. Bolotin, and J. Valentine, “Hot Electron-Based Near-Infrared Photodetection Using Bilayer MoS2.,” Nano Lett. 15(11), 7440–7444 (2015).
[Crossref] [PubMed]

Boulos, S. P.

A. M. Alkilany, L. B. Thompson, S. P. Boulos, P. N. Sisco, and C. J. Murphy, “Gold nanorods: their potential for photothermal therapeutics and drug delivery, tempered by the complexity of their biological interactions,” Adv. Drug Deliv. Rev. 64(2), 190–199 (2012).
[Crossref] [PubMed]

Brivio, J.

B. Radisavljevic, A. Radenovic, J. Brivio, V. Giacometti, and A. Kis, “Single-layer MoS2 transistors,” Nat. Nanotechnol. 6(3), 147–150 (2011).
[Crossref] [PubMed]

Brus, L. E.

C. Lee, H. Yan, L. E. Brus, T. F. Heinz, J. Hone, and S. Ryu, “Anomalous lattice vibrations of single- and few-layer MoS2.,” ACS Nano 4(5), 2695–2700 (2010).
[Crossref] [PubMed]

Cha, G. B.

W. Choi, M. Y. Cho, A. Konar, J. H. Lee, G. B. Cha, S. C. Hong, S. Kim, J. Kim, D. Jena, J. Joo, and S. Kim, “High-detectivity multilayer MoS(2) phototransistors with spectral response from ultraviolet to infrared,” Adv. Mater. 24(43), 5832–5836 (2012).
[Crossref] [PubMed]

Chai, Y.

Chan, H. L. W.

Chang, C. S.

Y. H. Lee, X. Q. Zhang, W. Zhang, M. T. Chang, C. T. Lin, K. D. Chang, Y. C. Yu, J. T. Wang, C. S. Chang, L. J. Li, and T. W. Lin, “Synthesis of large-area MoS2 atomic layers with chemical vapor deposition,” Adv. Mater. 24(17), 2320–2325 (2012).
[Crossref] [PubMed]

Chang, C. W.

K. C. Lee, Y. H. Chen, H. Y. Lin, C. C. Cheng, P. Y. Chen, T. Y. Wu, M. H. Shih, K. H. Wei, L. J. Li, and C. W. Chang, “Plasmonic gold nanorods coverage influence on enhancement of the photoluminescence of two-dimensional MoS2 monolayer,” Sci. Rep. 5(1), 16374 (2015).
[Crossref] [PubMed]

Chang, H.

Z. Sun and H. Chang, “Graphene and graphene-like two-dimensional materials in photodetection: mechanisms and methodology,” ACS Nano 8(5), 4133–4156 (2014).
[Crossref] [PubMed]

Chang, K. D.

Y. H. Lee, X. Q. Zhang, W. Zhang, M. T. Chang, C. T. Lin, K. D. Chang, Y. C. Yu, J. T. Wang, C. S. Chang, L. J. Li, and T. W. Lin, “Synthesis of large-area MoS2 atomic layers with chemical vapor deposition,” Adv. Mater. 24(17), 2320–2325 (2012).
[Crossref] [PubMed]

Chang, M. T.

Y. H. Lee, X. Q. Zhang, W. Zhang, M. T. Chang, C. T. Lin, K. D. Chang, Y. C. Yu, J. T. Wang, C. S. Chang, L. J. Li, and T. W. Lin, “Synthesis of large-area MoS2 atomic layers with chemical vapor deposition,” Adv. Mater. 24(17), 2320–2325 (2012).
[Crossref] [PubMed]

Chang, Y. G.

H. S. Lee, S. W. Min, Y. G. Chang, M. K. Park, T. Nam, H. Kim, J. H. Kim, S. Ryu, and S. Im, “MoS2 nanosheet phototransistors with thickness-modulated optical energy gap,” Nano Lett. 12(7), 3695–3700 (2012).
[Crossref] [PubMed]

Chang, Y. H.

W. Zhang, J. K. Huang, C. H. Chen, Y. H. Chang, Y. J. Cheng, and L. J. Li, “High-gain phototransistors based on a CVD MoS2 monolayer,” Adv. Mater. 25(25), 3456–3461 (2013).
[Crossref] [PubMed]

Chen, C.

C. Chen, H. Qiao, S. Lin, C. Man Luk, Y. Liu, Z. Xu, J. Song, Y. Xue, D. Li, J. Yuan, W. Yu, C. Pan, S. Ping Lau, and Q. Bao, “Highly responsive MoS2 photodetectors enhanced by graphene quantum dots,” Sci. Rep. 5(1), 11830 (2015).
[Crossref] [PubMed]

Chen, C. H.

W. Zhang, M. H. Chiu, C. H. Chen, W. Chen, L. J. Li, and A. T. S. Wee, “Role of Metal Contacts in High-Performance Phototransistors Based on WSe2 Monolayers,” ACS Nano 8(8), 8653–8661 (2014).
[Crossref] [PubMed]

W. Zhang, J. K. Huang, C. H. Chen, Y. H. Chang, Y. J. Cheng, and L. J. Li, “High-gain phototransistors based on a CVD MoS2 monolayer,” Adv. Mater. 25(25), 3456–3461 (2013).
[Crossref] [PubMed]

Chen, L.

L. Chen, F. Xue, X. Li, X. Huang, L. Wang, J. Kou, and Z. L. Wang, “Strain-gated field effect transistor of a MoS2-ZnO 2D-1D Hybrid Structure,” ACS Nano 10(1), 1546–1551 (2016).
[Crossref] [PubMed]

Chen, P. Y.

K. C. Lee, Y. H. Chen, H. Y. Lin, C. C. Cheng, P. Y. Chen, T. Y. Wu, M. H. Shih, K. H. Wei, L. J. Li, and C. W. Chang, “Plasmonic gold nanorods coverage influence on enhancement of the photoluminescence of two-dimensional MoS2 monolayer,” Sci. Rep. 5(1), 16374 (2015).
[Crossref] [PubMed]

Chen, Q.

Q. Ji, M. Kan, Y. Zhang, Y. Guo, D. Ma, J. Shi, Q. Sun, Q. Chen, Y. Zhang, and Z. Liu, “Unravelling orientation distribution and merging behavior of monolayer MoS2 domains on sapphire,” Nano Lett. 15(1), 198–205 (2015).
[Crossref] [PubMed]

Chen, W.

W. Zhang, M. H. Chiu, C. H. Chen, W. Chen, L. J. Li, and A. T. S. Wee, “Role of Metal Contacts in High-Performance Phototransistors Based on WSe2 Monolayers,” ACS Nano 8(8), 8653–8661 (2014).
[Crossref] [PubMed]

J. Lin, H. Li, H. Zhang, and W. Chen, “Plasmonic enhancement of photocurrent in MoS2 field-effect-transistor,” Appl. Phys. Lett. 102(20), 203109 (2013).
[Crossref]

Chen, X.

X. Wang, P. Wang, J. Wang, W. Hu, X. Zhou, N. Guo, H. Huang, S. Sun, H. Shen, T. Lin, M. Tang, L. Liao, A. Jiang, J. Sun, X. Meng, X. Chen, W. Lu, and J. Chu, “Ultrasensitive and broadband MoS2 photodetector driven by ferroelectrics,” Adv. Mater. 27(42), 6575–6581 (2015).
[Crossref] [PubMed]

J. Miao, W. Hu, Y. Jing, W. Luo, L. Liao, A. Pan, S. Wu, J. Cheng, X. Chen, and W. Lu, “Surface Plasmon-Enhanced Photodetection in Few Layer MoS2 Phototransistors with Au Nanostructure Arrays,” Small 11(20), 2392–2398 (2015).
[Crossref] [PubMed]

Z. Yin, H. Li, H. Li, L. Jiang, Y. Shi, Y. Sun, G. Lu, Q. Zhang, X. Chen, and H. Zhang, “Single-layer MoS2 phototransistors,” ACS Nano 6(1), 74–80 (2012).
[Crossref] [PubMed]

Chen, Y.

Y. Chen, L. Gan, H. Li, Y. Ma, and T. Zhai, “Achieving uniform monolayer transition metal dichalcogenides film on silicon wafer via silanization treatment: a typical study on WS2,” Adv. Mater. 29(7), 163550 (2017).
[Crossref] [PubMed]

H. Fang, Z. Lin, X. Wang, C. Y. Tang, Y. Chen, F. Zhang, Y. Chai, Q. Li, Q. Yan, H. L. W. Chan, and J. Y. Dai, “Infrared light gated MoS2 field effect transistor,” Opt. Express 23(25), 31908–31914 (2015).
[Crossref] [PubMed]

Chen, Y. H.

K. C. Lee, Y. H. Chen, H. Y. Lin, C. C. Cheng, P. Y. Chen, T. Y. Wu, M. H. Shih, K. H. Wei, L. J. Li, and C. W. Chang, “Plasmonic gold nanorods coverage influence on enhancement of the photoluminescence of two-dimensional MoS2 monolayer,” Sci. Rep. 5(1), 16374 (2015).
[Crossref] [PubMed]

Cheng, C. C.

K. C. Lee, Y. H. Chen, H. Y. Lin, C. C. Cheng, P. Y. Chen, T. Y. Wu, M. H. Shih, K. H. Wei, L. J. Li, and C. W. Chang, “Plasmonic gold nanorods coverage influence on enhancement of the photoluminescence of two-dimensional MoS2 monolayer,” Sci. Rep. 5(1), 16374 (2015).
[Crossref] [PubMed]

Cheng, J.

J. Miao, W. Hu, Y. Jing, W. Luo, L. Liao, A. Pan, S. Wu, J. Cheng, X. Chen, and W. Lu, “Surface Plasmon-Enhanced Photodetection in Few Layer MoS2 Phototransistors with Au Nanostructure Arrays,” Small 11(20), 2392–2398 (2015).
[Crossref] [PubMed]

Cheng, R.

Y. Liu, R. Cheng, L. Liao, H. Zhou, J. Bai, G. Liu, L. Liu, Y. Huang, and X. Duan, “Plasmon resonance enhanced multicolour photodetection by graphene,” Nat. Commun. 2, 579 (2011).
[Crossref] [PubMed]

Cheng, Y. J.

W. Zhang, J. K. Huang, C. H. Chen, Y. H. Chang, Y. J. Cheng, and L. J. Li, “High-gain phototransistors based on a CVD MoS2 monolayer,” Adv. Mater. 25(25), 3456–3461 (2013).
[Crossref] [PubMed]

Chiu, M. H.

W. Zhang, M. H. Chiu, C. H. Chen, W. Chen, L. J. Li, and A. T. S. Wee, “Role of Metal Contacts in High-Performance Phototransistors Based on WSe2 Monolayers,” ACS Nano 8(8), 8653–8661 (2014).
[Crossref] [PubMed]

Cho, J. H.

S. H. Yu, Y. Lee, S. K. Jang, J. Kang, J. Jeon, C. Lee, J. Y. Lee, H. Kim, E. Hwang, S. Lee, and J. H. Cho, “Dye-sensitized MoS2 photodetector with enhanced spectral photoresponse,” ACS Nano 8(8), 8285–8291 (2014).
[Crossref] [PubMed]

Cho, M. Y.

W. Choi, M. Y. Cho, A. Konar, J. H. Lee, G. B. Cha, S. C. Hong, S. Kim, J. Kim, D. Jena, J. Joo, and S. Kim, “High-detectivity multilayer MoS(2) phototransistors with spectral response from ultraviolet to infrared,” Adv. Mater. 24(43), 5832–5836 (2012).
[Crossref] [PubMed]

Choi, S.

S. Choi, Z. Shaolin, and W. Yang, “Layer-number-dependent work function of MoS2 nanoflakes,” J. Korean Phys. Soc. 64(10), 1550–1555 (2014).
[Crossref]

Choi, W.

W. Choi, M. Y. Cho, A. Konar, J. H. Lee, G. B. Cha, S. C. Hong, S. Kim, J. Kim, D. Jena, J. Joo, and S. Kim, “High-detectivity multilayer MoS(2) phototransistors with spectral response from ultraviolet to infrared,” Adv. Mater. 24(43), 5832–5836 (2012).
[Crossref] [PubMed]

Christopher, P.

S. Linic, P. Christopher, and D. B. Ingram, “Plasmonic-metal nanostructures for efficient conversion of solar to chemical energy,” Nat. Mater. 10(12), 911–921 (2011).
[Crossref] [PubMed]

Chu, J.

X. Wang, P. Wang, J. Wang, W. Hu, X. Zhou, N. Guo, H. Huang, S. Sun, H. Shen, T. Lin, M. Tang, L. Liao, A. Jiang, J. Sun, X. Meng, X. Chen, W. Lu, and J. Chu, “Ultrasensitive and broadband MoS2 photodetector driven by ferroelectrics,” Adv. Mater. 27(42), 6575–6581 (2015).
[Crossref] [PubMed]

Coleman, J. N.

Q. H. Wang, K. Kalantar-Zadeh, A. Kis, J. N. Coleman, and M. S. Strano, “Electronics and optoelectronics of two-dimensional transition metal dichalcogenides,” Nat. Nanotechnol. 7(11), 699–712 (2012).
[Crossref] [PubMed]

Dai, J. Y.

Deng, H.

C. Hu, D. Dong, X. Yang, K. Qiao, D. Yang, H. Deng, S. Yuan, J. Khan, Y. Lan, H. Song, and J. Tang, “Synergistic Effect of Hybrid PbS Quantum Dots/2D-WSe2 Toward High Performance and Broadband Phototransistors,” Adv. Funct. Mater. 27(2), 1603605 (2017).
[Crossref]

Deutsch, B.

P. Bharadwaj, B. Deutsch, and L. Novotny, “Optical Antennas,” Adv. Opt. Photonics 1(3), 438 (2009).
[Crossref]

Dong, D.

C. Hu, D. Dong, X. Yang, K. Qiao, D. Yang, H. Deng, S. Yuan, J. Khan, Y. Lan, H. Song, and J. Tang, “Synergistic Effect of Hybrid PbS Quantum Dots/2D-WSe2 Toward High Performance and Broadband Phototransistors,” Adv. Funct. Mater. 27(2), 1603605 (2017).
[Crossref]

Dresselhaus, M. S.

X. Ling, Y. H. Lee, Y. Lin, W. Fang, L. Yu, M. S. Dresselhaus, and J. Kong, “Role of the seeding promoter in MoS2 growth by chemical vapor deposition,” Nano Lett. 14(2), 464–472 (2014).
[Crossref] [PubMed]

Duan, X.

Y. Liu, R. Cheng, L. Liao, H. Zhou, J. Bai, G. Liu, L. Liu, Y. Huang, and X. Duan, “Plasmon resonance enhanced multicolour photodetection by graphene,” Nat. Commun. 2, 579 (2011).
[Crossref] [PubMed]

Dubey, M.

F. Xia, H. Wang, D. Xiao, M. Dubey, and A. Ramasubramaniam, “Two-dimensional material nanophotonics,” Nat. Photonics 8(12), 899–907 (2014).
[Crossref]

Dubonos, S. V.

K. S. Novoselov, A. K. Geim, S. V. Morozov, D. Jiang, Y. Zhang, S. V. Dubonos, I. V. Grigorieva, and A. A. Firsov, “Electric field effect in atomically thin carbon films,” Science 306(5696), 666–669 (2004).
[Crossref] [PubMed]

Fang, H.

Fang, W.

X. Ling, Y. H. Lee, Y. Lin, W. Fang, L. Yu, M. S. Dresselhaus, and J. Kong, “Role of the seeding promoter in MoS2 growth by chemical vapor deposition,” Nano Lett. 14(2), 464–472 (2014).
[Crossref] [PubMed]

Fang, Z.

Y. Kang, S. Najmaei, Z. Liu, Y. Bao, Y. Wang, X. Zhu, N. J. Halas, P. Nordlander, P. M. Ajayan, J. Lou, and Z. Fang, “Plasmonic hot electron induced structural phase transition in a MoS2 monolayer,” Adv. Mater. 26(37), 6467–6471 (2014).
[Crossref] [PubMed]

Feng, Q.

J. Hong, Z. Hu, M. Probert, K. Li, D. Lv, X. Yang, L. Gu, N. Mao, Q. Feng, L. Xie, J. Zhang, D. Wu, Z. Zhang, C. Jin, W. Ji, X. Zhang, J. Yuan, and Z. Zhang, “Exploring atomic defects in molybdenum disulphide monolayers,” Nat. Commun. 6, 6293 (2015).
[Crossref] [PubMed]

Ferrari, A. C.

F. H. Koppens, T. Mueller, P. Avouris, A. C. Ferrari, M. S. Vitiello, and M. Polini, “Photodetectors based on graphene, other two-dimensional materials and hybrid systems,” Nat. Nanotechnol. 9(10), 780–793 (2014).
[Crossref] [PubMed]

Firsov, A. A.

K. S. Novoselov, A. K. Geim, S. V. Morozov, D. Jiang, Y. Zhang, S. V. Dubonos, I. V. Grigorieva, and A. A. Firsov, “Electric field effect in atomically thin carbon films,” Science 306(5696), 666–669 (2004).
[Crossref] [PubMed]

Gan, L.

Y. Chen, L. Gan, H. Li, Y. Ma, and T. Zhai, “Achieving uniform monolayer transition metal dichalcogenides film on silicon wafer via silanization treatment: a typical study on WS2,” Adv. Mater. 29(7), 163550 (2017).
[Crossref] [PubMed]

N. Zhou, B. Xu, L. Gan, J. Zhang, J. Han, and T. Zhai, “Narrowband spectrally selective near-infrared photodetector based on up-conversion nanoparticles used in a 2D hybrid device,” J. Mater. Chem. C Mater. Opt. Electron. Devices 5(7), 1591–1595 (2017).
[Crossref]

Z. Zheng, L. Gan, H. Li, Y. Ma, Y. Bando, D. Golberg, and T. Zhai, “A fully transparent and flexible ultraviolet-visible photodetector based on controlled electrospun ZnO-CdO heterojunction nanofiber arrays,” Adv. Funct. Mater. 25(37), 5885–5894 (2015).
[Crossref]

Gao, Y.

Geim, A. K.

K. S. Novoselov, A. K. Geim, S. V. Morozov, D. Jiang, Y. Zhang, S. V. Dubonos, I. V. Grigorieva, and A. A. Firsov, “Electric field effect in atomically thin carbon films,” Science 306(5696), 666–669 (2004).
[Crossref] [PubMed]

Giacometti, V.

B. Radisavljevic, A. Radenovic, J. Brivio, V. Giacometti, and A. Kis, “Single-layer MoS2 transistors,” Nat. Nanotechnol. 6(3), 147–150 (2011).
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J. H. Kim, J. Lee, J. H. Kim, C. C. Hwang, C. Lee, and J. Y. Park, “Work function variation of MoS2 atomic layers grown with chemical vapor deposition: The effects of thickness and the adsorption of water/oxygen molecules,” Appl. Phys. Lett. 106(25), 251606 (2015).
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W. Choi, M. Y. Cho, A. Konar, J. H. Lee, G. B. Cha, S. C. Hong, S. Kim, J. Kim, D. Jena, J. Joo, and S. Kim, “High-detectivity multilayer MoS(2) phototransistors with spectral response from ultraviolet to infrared,” Adv. Mater. 24(43), 5832–5836 (2012).
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S. H. Yu, Y. Lee, S. K. Jang, J. Kang, J. Jeon, C. Lee, J. Y. Lee, H. Kim, E. Hwang, S. Lee, and J. H. Cho, “Dye-sensitized MoS2 photodetector with enhanced spectral photoresponse,” ACS Nano 8(8), 8285–8291 (2014).
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K. C. Lee, Y. H. Chen, H. Y. Lin, C. C. Cheng, P. Y. Chen, T. Y. Wu, M. H. Shih, K. H. Wei, L. J. Li, and C. W. Chang, “Plasmonic gold nanorods coverage influence on enhancement of the photoluminescence of two-dimensional MoS2 monolayer,” Sci. Rep. 5(1), 16374 (2015).
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S. H. Yu, Y. Lee, S. K. Jang, J. Kang, J. Jeon, C. Lee, J. Y. Lee, H. Kim, E. Hwang, S. Lee, and J. H. Cho, “Dye-sensitized MoS2 photodetector with enhanced spectral photoresponse,” ACS Nano 8(8), 8285–8291 (2014).
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S. H. Yu, Y. Lee, S. K. Jang, J. Kang, J. Jeon, C. Lee, J. Y. Lee, H. Kim, E. Hwang, S. Lee, and J. H. Cho, “Dye-sensitized MoS2 photodetector with enhanced spectral photoresponse,” ACS Nano 8(8), 8285–8291 (2014).
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H. S. Lee, M. S. Kim, Y. Jin, G. H. Han, Y. H. Lee, and J. Kim, “Efficient exciton-plasmon conversion in Ag nanowire/monolayer MoS2Hybrids: direct imaging and quantitative estimation of plasmon coupling and propagation,” Adv. Opt. Mater. 3(7), 943–947 (2015).
[Crossref]

X. Ling, Y. H. Lee, Y. Lin, W. Fang, L. Yu, M. S. Dresselhaus, and J. Kong, “Role of the seeding promoter in MoS2 growth by chemical vapor deposition,” Nano Lett. 14(2), 464–472 (2014).
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D. Lembke, S. Bertolazzi, and A. Kis, “Single-layer MoS2 electronics,” Acc. Chem. Res. 48(1), 100–110 (2015).
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C. Chen, H. Qiao, S. Lin, C. Man Luk, Y. Liu, Z. Xu, J. Song, Y. Xue, D. Li, J. Yuan, W. Yu, C. Pan, S. Ping Lau, and Q. Bao, “Highly responsive MoS2 photodetectors enhanced by graphene quantum dots,” Sci. Rep. 5(1), 11830 (2015).
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Y. Chen, L. Gan, H. Li, Y. Ma, and T. Zhai, “Achieving uniform monolayer transition metal dichalcogenides film on silicon wafer via silanization treatment: a typical study on WS2,” Adv. Mater. 29(7), 163550 (2017).
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Z. Zheng, L. Gan, H. Li, Y. Ma, Y. Bando, D. Golberg, and T. Zhai, “A fully transparent and flexible ultraviolet-visible photodetector based on controlled electrospun ZnO-CdO heterojunction nanofiber arrays,” Adv. Funct. Mater. 25(37), 5885–5894 (2015).
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Y. Liu, X. Zhang, J. Su, H. Li, Q. Zhang, and Y. Gao, “Ag nanoparticles@ZnO nanowire composite arrays: an absorption enhanced UV photodetector,” Opt. Express 22(24), 30148–30155 (2014).
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J. Lin, H. Li, H. Zhang, and W. Chen, “Plasmonic enhancement of photocurrent in MoS2 field-effect-transistor,” Appl. Phys. Lett. 102(20), 203109 (2013).
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Z. Yin, H. Li, H. Li, L. Jiang, Y. Shi, Y. Sun, G. Lu, Q. Zhang, X. Chen, and H. Zhang, “Single-layer MoS2 phototransistors,” ACS Nano 6(1), 74–80 (2012).
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Z. Yin, H. Li, H. Li, L. Jiang, Y. Shi, Y. Sun, G. Lu, Q. Zhang, X. Chen, and H. Zhang, “Single-layer MoS2 phototransistors,” ACS Nano 6(1), 74–80 (2012).
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J. Xia, X. Huang, L. Z. Liu, M. Wang, L. Wang, B. Huang, D. D. Zhu, J. J. Li, C. Z. Gu, and X. M. Meng, “CVD synthesis of large-area, highly crystalline MoSe2 atomic layers on diverse substrates and application to photodetectors,” Nanoscale 6(15), 8949–8955 (2014).
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K. C. Lee, Y. H. Chen, H. Y. Lin, C. C. Cheng, P. Y. Chen, T. Y. Wu, M. H. Shih, K. H. Wei, L. J. Li, and C. W. Chang, “Plasmonic gold nanorods coverage influence on enhancement of the photoluminescence of two-dimensional MoS2 monolayer,” Sci. Rep. 5(1), 16374 (2015).
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Li, T. H.

Y. N. Ma, J. Zhou, L. Shu, T. H. Li, L. Petti, and P. Mormile, “Optimizing Au/Ag core-shell nanorods: purification, stability, and surface modification,” J. Nanopart. Res. 16(6), 2439 (2014).
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H. Liu, A. T. Neal, and P. D. D. Ye, “Channel length scaling of MoS2 MOSFETs,” ACS Nano 6(10), 8563–8569 (2012).
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Y. Liu, R. Cheng, L. Liao, H. Zhou, J. Bai, G. Liu, L. Liu, Y. Huang, and X. Duan, “Plasmon resonance enhanced multicolour photodetection by graphene,” Nat. Commun. 2, 579 (2011).
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J. Xia, X. Huang, L. Z. Liu, M. Wang, L. Wang, B. Huang, D. D. Zhu, J. J. Li, C. Z. Gu, and X. M. Meng, “CVD synthesis of large-area, highly crystalline MoSe2 atomic layers on diverse substrates and application to photodetectors,” Nanoscale 6(15), 8949–8955 (2014).
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Y. Liu, R. Cheng, L. Liao, H. Zhou, J. Bai, G. Liu, L. Liu, Y. Huang, and X. Duan, “Plasmon resonance enhanced multicolour photodetection by graphene,” Nat. Commun. 2, 579 (2011).
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Q. Ji, M. Kan, Y. Zhang, Y. Guo, D. Ma, J. Shi, Q. Sun, Q. Chen, Y. Zhang, and Z. Liu, “Unravelling orientation distribution and merging behavior of monolayer MoS2 domains on sapphire,” Nano Lett. 15(1), 198–205 (2015).
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Y. Kang, S. Najmaei, Z. Liu, Y. Bao, Y. Wang, X. Zhu, N. J. Halas, P. Nordlander, P. M. Ajayan, J. Lou, and Z. Fang, “Plasmonic hot electron induced structural phase transition in a MoS2 monolayer,” Adv. Mater. 26(37), 6467–6471 (2014).
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S. Najmaei, Z. Liu, W. Zhou, X. Zou, G. Shi, S. Lei, B. I. Yakobson, J. C. Idrobo, P. M. Ajayan, and J. Lou, “Vapour phase growth and grain boundary structure of molybdenum disulphide atomic layers,” Nat. Mater. 12(8), 754–759 (2013).
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Z. Yin, H. Li, H. Li, L. Jiang, Y. Shi, Y. Sun, G. Lu, Q. Zhang, X. Chen, and H. Zhang, “Single-layer MoS2 phototransistors,” ACS Nano 6(1), 74–80 (2012).
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X. Wang, P. Wang, J. Wang, W. Hu, X. Zhou, N. Guo, H. Huang, S. Sun, H. Shen, T. Lin, M. Tang, L. Liao, A. Jiang, J. Sun, X. Meng, X. Chen, W. Lu, and J. Chu, “Ultrasensitive and broadband MoS2 photodetector driven by ferroelectrics,” Adv. Mater. 27(42), 6575–6581 (2015).
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J. Miao, W. Hu, Y. Jing, W. Luo, L. Liao, A. Pan, S. Wu, J. Cheng, X. Chen, and W. Lu, “Surface Plasmon-Enhanced Photodetection in Few Layer MoS2 Phototransistors with Au Nanostructure Arrays,” Small 11(20), 2392–2398 (2015).
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J. Miao, W. Hu, Y. Jing, W. Luo, L. Liao, A. Pan, S. Wu, J. Cheng, X. Chen, and W. Lu, “Surface Plasmon-Enhanced Photodetection in Few Layer MoS2 Phototransistors with Au Nanostructure Arrays,” Small 11(20), 2392–2398 (2015).
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Y. Chen, L. Gan, H. Li, Y. Ma, and T. Zhai, “Achieving uniform monolayer transition metal dichalcogenides film on silicon wafer via silanization treatment: a typical study on WS2,” Adv. Mater. 29(7), 163550 (2017).
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J. Xia, X. Huang, L. Z. Liu, M. Wang, L. Wang, B. Huang, D. D. Zhu, J. J. Li, C. Z. Gu, and X. M. Meng, “CVD synthesis of large-area, highly crystalline MoSe2 atomic layers on diverse substrates and application to photodetectors,” Nanoscale 6(15), 8949–8955 (2014).
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J. Miao, W. Hu, Y. Jing, W. Luo, L. Liao, A. Pan, S. Wu, J. Cheng, X. Chen, and W. Lu, “Surface Plasmon-Enhanced Photodetection in Few Layer MoS2 Phototransistors with Au Nanostructure Arrays,” Small 11(20), 2392–2398 (2015).
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Figures (6)

Fig. 1
Fig. 1 (a) Optical photograph of a triangular-shaped MoS2flake, bar: 50 μm. (b) AFM image showing its monolayer nature; inset: height profile of the white dashed line in the AFM image. (c)~(d) Raman & PL spectra obtained at the excitation wavelength of 532 nm. (e)~(f) HRTEM image and corresponding SAED pattern of the as-grown MoS2 flake.
Fig. 2
Fig. 2 (a) Schematic image of the monolayer MoS2 based transistor. (b) Optical image of the MoS2 transistor, the scale bar is 30 μm. (c) Output curves of the FET at various gate voltages of −20 V, −10 V, 0 V, 10 V, 20 V, and 30 V. (d) Transfer characteristics curves of the transistor measured in dark and 610 nm irradiation. (e) Photocurrent curves at various optical powers of 9.71, 6.45, 3.23, 0.88, 0.25 μW cm−2. (f) Scattering diagram of photoresponsivity under the illumination of various optical wavelengths, and the applied drain voltage is 5 V.
Fig. 3
Fig. 3 The dependence of the transistors’ photoresponsivity on the various diameters (a~d) of Ag NPs. Figures in the first row are diagrams of the photoresponsivity (R) as functions of the optical wavelength. Figures in the second row are the SEM images of Ag NPs corresponding to samples (a), (b), (c), and (d), respectively, the sale bar is 400 nm. Diagrams in the third row show distributions of the Ag particle size, where 500 particles are taken into statistics for each sample, and the black curves are Gaussian fitting of the histograms.
Fig. 4
Fig. 4 (a) The photoresponsivity for optical wavelength of 610 nm as functions of Ag particle size. (b) Energy band structure of MoS2/Ag heterostructure, the energy band of MoS2 bends downward when contacted with Ag. (c) Energy band sketches of the response process of LSPR enhanced photodetector.
Fig. 5
Fig. 5 (a) UV-Vis absorption curves of four bare MoS2 samples showing close absorptivities. (b) UV-Vis absorption curves for MoS2/Ag heterostructures based on the four bare MoS2 samples in (a), the evolution of absorptivity corresponds well with the photoresponsivity with the increase of particle size. (c) Raman scattering spectra of the samples with different Ag particle sizes.
Fig. 6
Fig. 6 (a) Time-dependent photocurrent response at the bias voltage of Vds = 5 V, and Vg = 0 V. The measurement was conducted under illumination of a white LED (30 μW cm−1), the device shows good stability. (b) ~(c) Extraction of response and decay time for the device of bare MoS2 (b) and the one coated with Ag NPs (c).

Tables (1)

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Table 1 Performance comparison of this work and other modifying methods reported.

Equations (1)

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μ= L W V ds ε 0 ε r d 1 d I ds d V g

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