Multi-functional Interface Repair Strategy for High Performance FAPbI3 Photodetectors

Abstract

Perovskite photodiodes have captured significant interest from researchers due to their extensive potential application in optical communication and high-resolution imaging. Nevertheless, the prevalent issues of high dark current and low detectivity impede the real-time transmission of signals. In this work, we propose an effective iodine defect compensation strategy for flexible perovskite photodetectors (PDs) by employing 1,3-Diiodo-5,5-dimethylhydantoin (DIH) molecules to mitigate iodine defects on the surface and stabilize lead ions through the formation of strong lead-oxygen bonds. As a result, this approach significantly suppresses non-radiative recombination, passivates defects, and enhances charge carrier mobility and extraction efficiency. The optimized flexible PDs exhibit a dark current of 9.0×10⁻¹² A, a detectivity of 3.5×10¹³ Jones, a response time of 0.105 ms, and exceptional stability. This research introduces a novel concept for multifunctional interface repair strategy.