Ultrafast Monolayer In/Gr-WS2 -Gr Hybrid Photodetectors with High Gain

ACS Nano
Chao-Hui YehPo-Wen Chiu

Abstract

One of the primary limitations of previously reported two-dimensional (2D) photodetectors is a low frequency response (≪ 1 Hz) for sensitive devices with gain. Yet, little efforts have been devoted to improve the temporal response of photodetectors while maintaining high gain and responsivity. Here, we demonstrate a gain of 6.3 × 103 electrons per photon and a responsivity of 2.6 × 103 A/W while simultaneously exhibiting an ultrafast response time of 40-65 μs in a hybrid photodetector that consists of graphene-WS2-graphene junctions covered with indium (In) adatoms atop. The resultant responsivity is 6 orders of magnitude higher than that of conventional photodetectors comprising solely of a Au-WS2-Au junction. The photogain is provided mainly by the adsorbed In adatoms, from which photogenerated electrons can be transferred to the WS2 channel, while holes remain trapped in In adatoms, leading to a photogating effect as electrons are recirculating during the residence of holes in In adatoms. At a gate voltage near the Dirac point of graphene, a detectivity of D* = 2.2 × 1012 Jones and an ON/OFF ratio of 104 are achieved. The enhanced performance of the device can be attributed partly to the transparent graphene/WS2 contact and ...Continue Reading

References

Dec 15, 1994·Physical Review. B, Condensed Matter·P E Blöchl
Oct 15, 1996·Physical Review. B, Condensed Matter·G Kresse, J Furthmüller
Nov 1, 1993·Physical Review. B, Condensed Matter·G Kresse, J Hafner
Oct 28, 1996·Physical Review Letters·J P PerdewM Ernzerhof
Jul 14, 2006·Nature·Gerasimos KonstantatosEdward H Sargent
May 18, 2010·Nature Nanotechnology·Gerasimos Konstantatos, Edward H Sargent
Mar 1, 2011·ACS Nano·Yung-Chang LinPo-Wen Chiu
Dec 14, 2011·Nano Letters·Yung-Chang LinPo-Wen Chiu
Dec 15, 2011·ACS Nano·Zongyou YinHua Zhang
May 9, 2012·Nature Nanotechnology·Gerasimos KonstantatosFrank H L Koppens
Nov 8, 2012·Nature Nanotechnology·Qing Hua WangMichael S Strano
May 25, 2013·Advanced Materials·Wenjing ZhangLain-Jong Li
Jun 12, 2013·Nature Nanotechnology·Oriol Lopez-SanchezAndras Kis
Jun 3, 2014·Nature Communications·Zheng LiuKazu Suenaga
Aug 26, 2014·ACS Applied Materials & Interfaces·Pramoda K NayakPo-Wen Chiu
Oct 10, 2014·Nano Letters·Marco M FurchiThomas Mueller
Nov 18, 2014·Advanced Materials·Dominik KuferGerasimos Konstantatos
Oct 27, 2015·Nano Letters·Dominik Kufer, Gerasimos Konstantatos
Nov 18, 2015·Nature Communications·Haining WangFarhan Rana
Jan 28, 2016·Advanced Materials·Xi LingJing Kong
Mar 2, 2016·Nanoscale·Pramoda K NayakPo-Wen Chiu
Jun 15, 2016·ACS Nano·Marcos H D GuimarãesJiwoong Park
Mar 2, 2017·Advanced Materials·Nengjie HuoGerasimos Konstantatos
Apr 19, 2017·Advanced Materials·Jake D MehewSaverio Russo
Jul 1, 2017·ACS Nano·Po-Hsun HoPo-Wen Chiu
Jul 19, 2017·Nanotechnology·Zhan WangYue Hao
Sep 26, 2017·ACS Applied Materials & Interfaces·Chao-Hui YehPo-Wen Chiu
Jan 18, 2019·ACS Applied Materials & Interfaces·Chao-Hui YehPo-Wen Chiu

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Citations

Mar 14, 2020·Nanoscale Research Letters·Yu-Ting LinYi-Hsien Lee
Aug 9, 2021·Advanced Science·Junseok SeoTakhee Lee
Apr 10, 2020·ACS Nano·Tsung-Han TsaiPo-Wen Chiu
Sep 19, 2019·ACS Applied Materials & Interfaces·Tsung-Han TsaiPo-Wen Chiu
Jun 28, 2019·ACS Nano·Chun-Hao ChuPo-Wen Chiu
Jan 8, 2022·ACS Applied Materials & Interfaces·Ming-Deng SiaoPo-Wen Chiu

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