Self-Powered 3D TIs Bi_2Te_3 Thin Film/Pentacene Heterojunction Photodetector with Broadband Response

摘要

Topological insulators (TIs) are theoretically predicted to be promising candidate materials for broadband photodetection from the visible to the infrared (IR). As a 3DTI, Bi_2Te_3 has reattracted greater interest in recent years. Here, we report a study on a self-powered organic/inorganic photodetector based on N-type Bi_2Te_3 thin films and P-type pentacene heterojunction with wideband response from 450 nm to 1550 nm. In addition, the optimized responsivity reaches 14.89 A W~(-1), with the corresponding eternal quantum effciency of 2840%. These excellent properties prove that the combination with low molecular weight organic matter is the future direction for the preparation of high performance photodetectors by TIs. The findings represent a fundamental form scenario for advancement of the next-generation high-performance array photodetectors and highly integrated optoelectronic products.