Ultrafast visible-infrared photodetector based on the SnSe2/Bi2Se3 heterostructure

Using the inherent properties of a heterostructure, ultrafast photodetectors with high sensitivity can be progressively developed that have the potential to carve a niche among the optoelectronic devices. In this Letter, a heterojunction photodetector based on SnSe2/Bi2Se3 is constructed, and a visible-infrared photoresponse with good sensitivity at room temperature is obtained. The SnSe2/Bi2Se3 photodetector demonstrates a high Iph/Id ratio of 1.2x10(4) at 0V. Moreover, the high responsivity of 2.3 A/W, detectivity of 1.6x10(11) Jones, and fast response time of 40 mu s are simultaneously achieved. The presented results offer an alternative route for ultrafast photodetectors with high sensitivity. (c) 2022 Optica Publishing Group

Automated summary

This study presents a heterojunction photodetector based on SnSe2/Bi2Se3, which exhibits a visible-infrared photoresponse with good sensitivity at room temperature. The photodetector achieves a high Iph/Id ratio, responsivity, and detectivity, in addition to a fast response time. These results offer an alternative route for developing ultrafast photodetectors with high sensitivity.