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Highly Responsive Ultrathin GaS Nanosheet Photodetectors on Rigid and Flexible Substrates

Open access
Hu, PingAn, Wang, Lifeng, Yoon, Mina, Zhang, Jia, Feng, Wei, Wang, Xiaona, Wen, Zhenzhong, Idrobo, Juan Carlos, Miyamoto, Yoshiyuki, Geohegan, David B., Xiao, Kai·2013·Nano Letters

Abstract

The first GaS nanosheet-based photodetectors are demonstrated on both mechanically rigid and flexible substrates. Highly crystalline, exfoliated GaS nanosheets are promising for optoelectronics due to strong absorption in the UV-visible wavelength region. Photocurrent measurements of GaS nanosheet photodetectors made on SiO2/Si substrates and flexible polyethylene terephthalate (PET) substrates exhibit a photoresponsivity at 254 nm up to 4.2 AW(-1) and 19.2 AW(-1), respectively, which exceeds that of graphene, MoS2, or other 2D material-based devices. Additionally, the linear dynamic range of the devices on SiO2/Si and PET substrates are 97.7 dB and 78.73 dB, respectively. Both surpass that of currently exploited InGaAs photodetectors (66 dB). Theoretical modeling of the electronic structures indicates that the reduction of the effective mass at the valence band maximum (VBM) with decreasing sheet thickness enhances the carrier mobility of the GaS nanosheets, contributing to the high photocurrents. Double-peak VBMs are theoretically predicted for ultrathin GaS nanosheets (thickness less than five monolayers), which is found to promote photon absorption. These theoretical and experimental results show that GaS nanosheets are promising materials for high-performance photodetectors on both conventional silicon and flexible substrates.

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Metadata

Authors
Hu, P., Wang, L., Yoon, M., Zhang, J., Feng, W., Wang, X., Wen, Z., Idrobo, J. C., Miyamoto, Y., Geohegan, D. B., & Xiao, K.
Venue
Nano Letters
Published
2013-03-06
Volume
13
Issue
4
Pages
1649-1654
ISSN
  • 1530-6984 (ISSN-L)
  • 1530-6992
OpenAlex
W2078010004
Cited by
824
References
5
FWCI
26.64
Type
journal article
Language
en
Open access
green

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CoChat. (2026). Citation check: Highly Responsive Ultrathin GaS Nanosheet Photodetectors on Rigid and Flexible Substrates. https://app.cochat.ai/papers/10.1021/nl400107k
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Hu, P., Wang, L., Yoon, M., Zhang, J., Feng, W., Wang, X., Wen, Z., Idrobo, J. C., Miyamoto, Y., Geohegan, D. B., & Xiao, K. (2013). Highly Responsive Ultrathin GaS Nanosheet Photodetectors on Rigid and Flexible Substrates. Nano Letters. https://doi.org/10.1021/nl400107k

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