Advanced Hybrid Perovskite Materials for High-Efficiency Solar Cells Under LowLight Conditions

Abstract

Hybrid organic-inorganic perovskite solar cells (PSCs) have been shown to have impressive power conversion efficiencies under bright sunlight; but their operation under low-light is a crucial area of indoor photovoltaic and diffuse-light energy collection. This paper reports a systematic exploration on improved hybrid perovskite material which has been designed to achieve high photovoltaic efficiency in low-irradiance conditions. After using mixed-cation, mixed-halide perovskite structures along with defect passivation and interface optimization, the charge recombination losses had been reduced considerably. Performance of the device was measured over a very large spectrum of light intensities and has shown a better performance in terms of voltage retention, carrier lifetimes, and low-light power conversion efficiency than the traditional perovskite devices. The results provide material design principles of the next generation of perovskite solar cells that are adapted to work in low-light conditions (indoor electronics, smart sensors, building-integrated energy system, etc.).