Assessment of Mixed Tin-Lead Perovskite as the Absorber Material for Fabrication of Highly Sensitive Broadband Photodetector

The relatively large bandgaps of the methylammonium lead halide perovskites are the major obstacle to achieving broadband response in the lead-based perovskite photodetectors. Partial or total substitution of lead with tin leads to smaller bandgaps for perovskite materials. Here, we investigated the application of a mixed tin-lead perovskite material, (FASnI۳)۰.۶(MAPbI۳)۰.۴, with small bandgap of ۱.۲۴ eV as the absorber material in a perovskite photodetector. The device simulation is performed by using SCAPS simulation software. The effect of different parameters such as absorber layer quality and thickness, interface defects, doping concentration and carrier mobility on the performance of the device is studied. The simulation results clarify that the parameters optimization can result in achieving a self-powered photodetector with broad spectral response from ۳۰۰ to ۱۰۵۰ nm wavelength, a high responsivity of ۰.۶ A W-۱ at ۹۳۰ nm, almost flat detectivity of over ۱۰۱۳ Jones and a wide linear dynamic range. We believe this study can provide theoretical guidance for the design of highly sensitive, broadband, mixed tin-lead perovskite photodetectors.

Keywords:

Broadband , High Sensitivity , Mixed Tin-Lead Perovskite , Photodetector , Self-Powered