Ultrathin GeSe Nanosheets: From Systematic Synthesis to Studies of Carrier Dynamics and Applications for a High-Performance UV–Vis Photodetector

• DOI: 10.1021/acsami.8b19836
• Publication Date: 2019-01-09T11:38:51Z
• Authors: Dingtao Ma; Jinlai Zhao; Rui Wang; Chenyang Xing; Zhongjun Li; Weichun Huang; Xiantao Jiang; Zhinan Guo; Zhengqian Luo; Yu Li; Jianqing Li; Shaojuan Luo; Yupeng Zhang; Han Zhang
• Keywords: Nanosheet; Exfoliation joint; Ultraviolet

Owing to the attractive energy band properties, a black phosphorus (BP)-analogue semiconductor, germanium selenide (GeSe), shows promising potential applied for optoelectronic devices. Herein, ultrathin GeSe nanosheets were systematically prepared via facile liquid-phase exfoliation approach, with controllable nanoscale thickness. Different from BP, exhibit good stability under both liquid and ambient conditions. Besides, its ultrafast carrier dynamics was probed by transient absorption spectroscopy. We showed that nanosheet-based photodetector exhibits excellent photoresponse behaviors ranging ultraviolet (UV) visible regime, high responsivity low dark current. Furthermore, detective ability of such device can be effectively modulated varying bias potential, light intensity, concentration electrolyte. Generally, our present contribution could not only supply fundamental knowledge photoelectrochemical (PEC)-type device, but also offer guidance extend other possible semiconductor materials in application PEC-type photodetector.