Single-crystal semiconductors such as silicon,germanium,and gallium arsenide consistently demon-strate higher photovoltaic conversion efficiencies in the field of solar energy.However,in the third-generation thin-film solar devices based on ABX3 type novel organic-inorganic hybrid metal halide perovskite materials,the latest cer-tified efficiency of over 26%has been achieved using polycrystalline thin films,while the highest efficiency for single-crystal perovskite solar cells is approximately 24%,with limited related research.Polycrystalline perovskite thin films exhibit high-density intrinsic structural defects(grain boundaries,vacancy defects,impurity defects,antisite defects,etc.),leading to issues of poor device stability and hysteresis effects,among others.In contrast,single-crystal perovskites offer advantages such as absence of grain boundaries,low defect density,long carrier lifetime,and long diffusion lengths.These characteristics position single-crystal perovskites as ideal candidates for high-per-formance optoelectronic devices.In the trajectory of semiconductor photovoltaic materials,the single-crystals remain the ultimate commercialization target.This review briefly outlines the basic device structure of single-crystal perovskite solar cells,systematically evaluates the advantages and disadvantages of various constituent single-crystal perovskite materials,explores diverse single-crystal perovskite material preparation/growth methods,and critically analyzes the latest research advancements,with an emphasis on the interplay among single-crystal perovskite materi-al composition,device structure,preparation methods,and performance.It is hoped that this review will provide valuable insights to catalyze the development of highly efficient and stable single-crystal perovskite solar cells by re-searchers in the field.
perovskite solar cellssingle-crystal perovskitedefectsspace-limited inverse temperature crystallization
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