Ultra-sensitive self-powered photodetector based on vertical MoTe2/MoS2 heterostructure

We report a self-powered photodetector based on the vertical p-MoTe2/n-MoS2 van der Waals heterostructure with indium tin oxide (ITO) electrodes, that exhibits an ultra-fast response of similar to 172 mu s and high responsivity (R) up to 146 mA W-1 in the wavelengths from 450 and 980 nm. An unique bidirectional photocurrent response was observed, varying from visible light to near infrared light, which could be attributed to the band alignments of type II heterostructure and ITO electrodes. This MoTe2/MoS2 heterostructure photodetector with ITO electrodes provides more opportunities for future nanoscale electronic and optoelectronic applications. (c) 2019 The Japan Society of Applied Physics