High efficiency of metal halide perovskite-based photovoltaic conversion

Abstract

Photovoltaic cells using metal halide perovskite crystals as semiconductors have achieved sunlight power conversion efficiency exceeding 26% comparable to the top efficiency of crystalline silicon solar cells. A key process of the device fabrication that affects device performance is the coating of source materials organic solution and subsequent crystallization of perovskite that forms a thin polycrystalline film (<1 mm). Therefore chemical processes that control the intermediate complexes are important for high-quality film capable of high efficiency. In this review, mechanism of crystallization and the method to enhance the photovoltaic performance of the perovskite solar cell by chemical passivation of crystal interfaces are discussed, focusing on improvement of photovoltage output by way of minimizing defect-assisted charge recombination at the interfaces.