文章基本信息

标题：Gap States Assisted MoO₃ Nanobelt Photodetector with Wide Spectrum Response
本地全文：下载
作者：Du Xiang ; Cheng Han ; Jialin Zhang 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2014
卷号：4
DOI：10.1038/srep04891
出版社：Springer Nature
摘要：Molybdenum oxides have been widely investigated for their broad applications ranging from electronics to energy storage. Photodetectors based on molybdenum trioxide (MoO₃), however, were seldom reported owing to their low conductivity and weak photoresponse. Herein we report a photodetector based on single MoO₃ nanobelt with wide visible spectrum response by introducing substantial gap states via H₂ annealing. The pristine MoO₃ nanobelt possessed low electrical conductance and no photoresponse for nearly all visible lights. The H₂ annealing can significantly improve the conductance of MoO₃ nanobelt, and result in a good photodetector with wide visible spectrum response. Under illumination of 680 nm light, the photodetector exhibited high responsivity of ~56 A/W and external quantum efficiency of ~10200%. As corroborated by in situ ultraviolet photoelectron spectroscopy and X-ray photoelectron spectroscopy investigations, such strong wide spectrum photoresponse arises from the largely enriched gap states in the MoO₃ nanobelt after H₂ annealing.