Broadband Photodetectors through Tunable Tunneling Heterointerfaces

Abstract

We report tunable tunneling van der Waals heterointerfaces with two strategies (oxidation layer and bandgap engineering) for broadband photodetection covering from the ultra-violet to the mid-infrared ranges.

Effect of Interfacial Contamination on the Charge Redistribution and Photoluminescence of the MoSe2/Au Heterostructure: Implications for Photodevices

“…A critical aspect of operating such devices is the interface’s electronic properties. For example, in photodetectors and photovoltaic devices, the effective signal (or power) is produced by the photogenerated electrons and holes separated in the field of heterojunction. − Semiconductor layers usually serve as an absorber where charge carriers are generated. While conductive layers provide nonradiative exciton decay pathways, exciton dissociation in the barrier field, and charge transfer, which is necessary to collect generated charge carriers to produce bias voltage. − In such devices, the interface conditions determine the efficiency of charge transfer between the absorber (semiconductive layer) and collector (conductive layer).…”