Polarons in perovskite solar cells: effects on photovoltaic performance and stability

Abstract Organic–inorganic hybrid perovskites manifest unique photophysical properties in terms of their long carrier lifetime, low recombination rate, and high defect tolerance, enabling them to be promising candidates optoelectronic devices. However, such advanced are unexpected perovskite materials with moderate charge mobility. Recent investigations have revealed that these appealing were endowed due the formation large polarons crystals, resulting from coupling photogenerated carriers a polarized crystal lattice, which largely affected carrier-transport dynamics structural stability solar cells (PSCs). In this review, first structure lattice mechanism elucidated. Then, modulation polaron states PSCs, including stabilization, polaron-facilitated transport, hot-carrier cells, polaron-related issues as polaron-induced metastable defects, polaronic strain, photostriction systematically investigated. Finally, prospect further understanding manipulating phenomena, working toward highly efficient stable is suggested.