NiTe2 Nanosheets for Broadband Photodetection

Materials showing type II Dirac fermions can generate abundant physical properties. NiTe2 is a type-II Dirac semimetal, however, most of the synthesis methods for 2D NiTe2 require a high temperature (>550 °C) or complex manipulations, leading to environmentally unstable products. Herein, a facile solvothermal method is designed to prepare NiTe2 nanosheets. Significantly, a NiTe2 nanosheet-based flexible photodetector responds with high sensitivy to wide range incident light from 450 to 1550 nm. Moreover, the NiTe2 nanosheets maintain high environmental stability for 30 days, and the output current of the device shows negligible decay over time.