Interfacial Pyro-Phototronic Effect: A Universal Approach for Enhancement of Self-Powered Photodetection Based on Perovskites with Centrosymmetry

Utilizing the pyro-phototronic effect presents a potent approach to augment the efficacy of self-powered photodetectors (PDs) that rely on metal halide perovskites (MHPs). Nevertheless, the pyro-phototronic effect has thus far been restricted to perovskites possessing a non-centrosymmetric crystal structure, limiting their scope of application. This study introduces a universal interfacial pyro-phototronic effect (IPPE) strategy to MHP single crystals with centrosymmetry. The utilization of heterojunctions or Schottky junctions has resulted in the observation of typical four-stage photoresponses with rapid speed, thereby significantly enhancing the performance of self-powered PDs and expanding the spectral response range. The contact conditions, such as the choice of metals and surface smoothness, have an important impact on IPPE. The IPPE approach is a versatile technique that can be employed to fabricate self-powered PDs based on diverse 3D and 2D perovskites. This study broadens the utilization of the pyro-phototronic phenomenon in centrosymmetric perovskites, which offer advantages in producing optoelectronic devices with superior performance. A universal interfacial pyro-phototronic effect approach for self-powered photodetection utilizing various centrosymmetric metal halide perovskite semiconductors is demonstrated, including 3D perovskites such as MAPbBr3 and MAPbCl3, as well as 2D perovskites like (PEA)2PbI4. The observation of pyro-phototronic effect-enhanced photoresponses can be achieved by fabricating heterojunctions or Schottky junctions utilizing materials with centrosymmetry.image