Ultrahigh photo-responsivity and detectivity in multilayer InSe nanosheets phototransistors with broadband response

Wei Feng, Jing Bin Wu, Xiaoli Li, Wei Zheng, Xin Zhou, Kai Xiao, Wenwu Cao, Bin Yang, Juan Carlos Idrobo, Leonardo Basile, Weiquan Tian, Ping Heng Tan, Ping An Hu

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Abstract

We demonstrate the strategies and principles for the performance improvement of layered semiconductor based photodetectors using multilayer indium selenide (InSe) as the model material. It is discovered that multiple reflection interference at the interfaces in the phototransistor device leads to a thickness-dependent photo-response, which provides a guideline to improve the performance of layered semiconductor based phototransistors. The responsivity and detectivity of InSe nanosheet phototransistor can be adjustable using applied gate voltage. Our InSe nanosheet phototransistor exhibits ultrahigh responsivity and detectivity. An ultrahigh external photo-responsivity of ∼104 A W-1 can be achieved from broad spectra ranging from UV to near infrared wavelength using our InSe nanosheet photodetectors. The detectivity of multilayer InSe devices is ∼1012 to 1013 Jones, which surpasses that of the currently exploited InGaAs photodetectors (1011 to 1012 Jones). This research shows that multilayer InSe nanosheets are promising materials for high performance photodetectors.

Original languageEnglish (US)
Pages (from-to)7022-7028
Number of pages7
JournalJournal of Materials Chemistry C
Volume3
Issue number27
DOIs
StatePublished - Jul 21 2015

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All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Chemistry

Cite this

Feng, W., Wu, J. B., Li, X., Zheng, W., Zhou, X., Xiao, K., Cao, W., Yang, B., Idrobo, J. C., Basile, L., Tian, W., Tan, P. H., & Hu, P. A. (2015). Ultrahigh photo-responsivity and detectivity in multilayer InSe nanosheets phototransistors with broadband response. Journal of Materials Chemistry C, 3(27), 7022-7028. https://doi.org/10.1039/c5tc01208b