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Highly Responsive Ultrathin GaS Nanosheet Photodetectors on Rigid and Flexible Substrates

CNMS Staff Science Highlight. Highly Responsive Ultrathin GaS Nanosheet Photodetectors on Rigid and Flexible Substrates. Scientific Achievement.

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Highly Responsive Ultrathin GaS Nanosheet Photodetectors on Rigid and Flexible Substrates

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  1. CNMS Staff Science Highlight Highly Responsive Ultrathin GaSNanosheetPhotodetectorson Rigid and Flexible Substrates Scientific Achievement Flexible ultrathin GaSnanosheets have been explored as photodetectors and demonstrated to have a responsivity higher than other two-dimensional (2D) nanomaterial devices, such as graphene and MoS2. First-principles electronic structure calculations revealed the significant reduction of the effective mass and the development of double-peak valence band maximum in the ultrathin GaSnanosheets as the origin of the enhanced photoresponse. Significance Two-dimensional nanomaterials have attracted considerable attention and show promise in photovoltaic, optoelectronic, terahertz (THz) generation and tuning devices. Here, 2D GaSnanosheets are demonstrated to be promising materials for UV-visphotodetectors with high photoresponse and external quantum efficiency on both silicon and flexible substrates, with intriguing electronic properties unveiled by theory. (a) Scheme of crystal structure: monolayer GaS with a thickness of 0.78 nm and (001) plane of monolayer GaS (bottom) (b) Theoretical calculation of the valence bands of various layers of GaS showed the effective masses and double valence band maximum features for up to 4 ML nanosheets. Research Details • Two-dimensional GaSnanosheets were mechanically exfoliated onto both rigid Si and flexible PET substrates from the bulk precursor. • The enhanced photoresponse and external quantum efficiency in ultrathin 2D GaSnanosheet UV-visphotodetectors were demonstrated and explained by first-principles calculations. (a) Z-contrast STEM images showing the hexagonal atomic structure of the GaSnanosheets; inset is an optical image of monolayer GaSnanosheets (b) optical images of flexible GaSnanosheetphotodetector devices. P. A. Hu, L. Wang, M. Yoon, J. Zhang, W. Feng, X. Wang, Z. Wen, J. C. Idrobo, Y. Miyamoto, D. B. Geohegan, K. Xiao, Nano Letters (2013) DOI: 10.1021/nl400107k.

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