High-performance self-powered flexible photodetectors based on Sb₂Te₃/Te heterojunction nanostructures

The growing demand for optoelectronic applications in portable smart devices has driven considerable interest in flexible photodetectors (PDs), owing to their outstanding flexibility and portability. In this study, we demonstrate a straightforward fabrication of flexible PDs based on self-assembled Sb 2 Te 3 /Te multilayer heterojunction nanostructure. The device exhibits a self-powered broadband photoresponse (405–980 nm), achieving a responsivity of 0.2 A/W and a specific detectivity of 2.2 × 10 10 Jones under 405 nm illumination. Mechanical bending tests further reveal excellent stability and robustness against external deformation. These results not only demonstrate a promising route toward high-performance flexible PDs, but also highlight the novelty of Sb 2 Te 3 /Te heterojunction engineering compared with previously reported systems.