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Visible-NIR Photodetectors Based on Low-Dimensional GeSe Micro-Crystals Designed Morphology and Improved Photoresponsivity

Abstract : GeSe micro-sheets and micro-belts have been synthesized by a facile one-pot wet chemical method in 1-octadecene solvent and oleic acid solvent, respectively. The adsorption of more oleic acid molecules on the (002) plane promoted growth along [010] direction of the GeSe micro-belts and limited carrier transport in this direction, resulting in higher carrier concentration and mobility of the GeSe micro-belts. The performance of the photodetectors based on the single GeSe micro-sheet and the single GeSe micro-belt was investigated under illumination at 532 nm, 980 nm and 1319 nm. Both, photodetectors based on a single GeSe micro-sheet and a single GeSe micro-belt, exhibit a high photoresponse, short response/recovery times, and long-term durability. Moreover, the photodetector based on a single GeSe micro-belt displays a broadband response with a high responsivity (5562 A/W at 532 nm, 1546 A/W at 980 nm) and detectivity (3.01×1012 Jones at 532 nm, 8.38×1011 Jones at 980 nm). These excellent characteristics render single GeSe micro-belts very interesting for use as highly efficient photodetectors, especially in the NIR region. © 2020 Wiley-VCH Verlag GmbH and Co. KGaA, Weinheim
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Submitted on : Tuesday, April 14, 2020 - 11:06:49 AM
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F. Zhao, X. Luo, L. Liu, J. Lv, X. Fan, et al.. Visible-NIR Photodetectors Based on Low-Dimensional GeSe Micro-Crystals Designed Morphology and Improved Photoresponsivity. ChemPhysChem, Wiley-VCH Verlag, 2020, 21 (5), pp.397-405. ⟨10.1002/cphc.201901217⟩. ⟨hal-02536600⟩

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