We have synthesized high-quality, micrometer-sized, single-crystal GeSe nanosheets using vapor transport and deposition techniques. Photoresponse is investigated based on mechanically exfoliated GeSe nanosheet combined with Au contacts under a global laser irradiation scheme. The nonlinearship, asymmetric, and unsaturated characteristics of the I-V curves reveal that two uneven back-to-back Schottky contacts are formed. First-principles calculations indicate that the occurrence of defects-induced in-gap defective states, which are responsible for the slow decay of the current in the OFF state and for the weak light intensity dependence of photocurrent. The Schottky photodetector exhibits a marked photoresponse to NIR light illumination at a wavelength of 808 nm. The significant photoresponse and good responsitivity suggests its potential applications as photodetectors.
@article{arxiv.1310.0436,
title = {NIR Schottky Photodetectors Based on Individual Single-Crystalline GeSe Nanosheet},
author = {Bablu Mukherjee and Yongqing Cai and Hui Ru Tan and Yuan Ping Feng and Eng Soon Tok and Chorng Haur Sow},
journal= {arXiv preprint arXiv:1310.0436},
year = {2018}
}