Fabrication of a cost effective and broadband self-powered photodetector based on Sb₂Te₃ and silicon

Abstract

The excellent conductive surface electronic states of topological insulators make them suitable candidates for the next generation optoelectronic devices. Moreover, their unique semiconducting properties are favorable for building heterojunctions with other semiconductors. Here, we fabricated a low cost and broadband self-powered photodetector based on Sb2Te3 and Si. The photolithography and thermal evaporation technique were combined to fabricate a series of asymmetric planar Sb2Te3 electrodes on the surface of an n-type silicon substrate. An obvious asymmetrical current voltage curve occurred under dark conditions, which is ascribed to the asymmetry of each electrode. During the photodetection test, self-powered photodetection was obtained upon 940 nm light irradiation. Moreover, the photodetector exhibited fast and broadband photodetection from 365 nm to 940 nm with a response time less than 40 ms.

Band Offsets, Optical Conduction, Photoelectric and Dielectric Dispersion in InSe/Sb2Te3 Heterojunctions

“…Furthermore, antimony telluride films coated onto Si substrates displayed photodetector characteristics presented by a self-powered fast and broad band photodetection. The response time of this device was less than 40 ms 12 .…”

Research progress on topological material-based photodetectors

“…76 Sb 2 Te 3 is a p-type semiconductor, and finding a suitable n-type material in combination with Sb 2 Te 3 could improve its photoelectric response. Si is an easily obtained n-type semiconductor, Yu et al 72 fabricated a broadband self-powered photodetector based on Sb 2 Te 3 and Si using photolithography and thermal evaporation technology. This detector has a fast response speed (<40 ms) and can realize photodetecting at 365–940 nm.…”

Piezoelectric potential enhanced photocatalytic performance based on ZnO with different nanostructures

“…The development of science and technology has brought a series of conveniences to human beings. New devices such as solar cells, lithium batteries and photodetectors have gradually entered the homes of general people [1][2][3][4][5][6]. However, the toxic by-products produced in the manufacturing process of devices in turn damage the environment and human health.…”