Self-Powered Multicolor Broadband Photodetector Based on GaSe/WSe2//WSe2/BP Van Der Waals Heterostructure

Nowadays, broadband photodetectors are gaining popularity among optoelectronic applications. However, 2-D materials-based Van der Waals heterostructures (vdWHs) photodetectors have a narrow photodetection scope. To broaden the detection bandwidth, a photodetector based on GaSe/WSe2 and WSe2/BP parallel-mode heterojunctions is presented in this work. For convenience, the parallel-mode structure of the GaSe/ WSe2 and WSe2/BP heterojunctions are denoted as GaSe/WSe2//WSe2/BP. GaSe/WSe2 and WSe2/BP heterojunctions show high detection performances in the ultraviolet-visible (UV-Vis) and visible-near infrared (Vis-NIR) spectra, respectively. Using the photoresponse complementary characteristics of GaSe/WSe2 and WSe2/BP heterojunctions, the GaSe/WSe2//WSe2/BP heterojunction photodetector demonstrates self-powered multicolor broadband photodetection cover UV-Vis-NIR spectra. Besides, the photodetector has an on-/off-ratio of approximate to 10(4), approximate to 0.1 pA dark current, and a short response time (similar to 40 mu s). Our work paves the way for developing 2-D materials-based high-performance broadband photodetectors.

Automated summary

This work presents a photodetector based on 2-D materials with parallel-mode heterojunctions, which demonstrates self-powered multicolor broadband photodetection and high detection performance in UV-Vis and Vis-NIR spectra. The photodetector features a high on/off ratio, low dark current, and short response time, paving the way for high-performance broadband photodetectors based on 2-D materials.