CdS nanobelt-based self-powered flexible photodetectors with high photosensitivity

Asymmetric contacts were used to assemble extremely photosensitive and self-powered photodetectors (SPDs) on rigid and polyimide (PI) substrates based on one-dimensional (1D)-CdS nanobelts. The photoresponse characteristics of the constructed devices were outstanding, including high photosensitivity (1.54 x 10(6)%), specific detectivity (2.36 x 10(12) Jones), responsivity (36 mA W-1) and noise equivalent power (2.94 x 10(-15) W Hz(-1/2)) with 215 mu W cm(-2) light irradiation, as well as having high reproducibility, environmental stability and speedy response of less than 30 ms. Flexible self-powered photodetectors (FSPDs) were also constructed on PI substrates, which had comparable photoresponse performance to the rigid one. Additionally, the as-fabricated FSPDs showed excellent folding endurance, electrical and mechanical flexural stability. Our findings suggest that the asymmetric contact device design used in this study is appropriate for high-performance FSPDs, particularly ultrafast nanodevices.

Automated summary

Asymmetric contacts were utilized in constructing high-performance self-powered flexible photodetectors on PI substrates, demonstrating excellent photoresponse characteristics such as high photosensitivity and responsivity.