Pyro-phototronic Effect Enhanced Self-Powered Photoresponse in Lead-Free Hybrid Perovskite.

Pyro-phototronic effect (PPE) can significantly boost the performance of hybrid perovskite (HPs) photodetectors due to the effective modulation of photogenerated charge carrier separations, transportation, and extraction. However, there are few reports on the application of PPE in lead-free HPs. Herein, a polar lead-free HP (1,3-BMACH)BiBr [1,3-BMACH = 1,3-(aminomethyl)cyclohexane] is synthesized and realized broadband self-powered photoresponse from X-rays to near-infrared (NIR) through the PPE. Particularly, this light-induced PPE in lead-free HPs breaks the limitation of the optical band gap, making them suitable for broadband self-powered photodetection. Under 405 nm illumination, compared with a purely photovoltaic system, is boosted by 3100%, and and * are both enhanced by 260% after coupled PPE. It is particularly interesting that an obvious X-ray-induced PPE phenomenon is also observed, which endows (1,3-BMACH)BiBr with a high sensitivity of 154 μC Gy cm and a low detection limit of 307 nGy s under the self-powered mode. The implementation of light-induced PPE from X-rays to NIR in lead-free HPs provides a new approach for constructing environmentally friendly, broadband, and self-powered optoelectronic devices in the future.