Confined growth of high-quality single crystal MAPbBr3 by inverse temperature crystallization for photovoltaic applications

다국어 초록 (Multilingual Abstract)

Organic–inorganic hybrid halide perovskite solar cells are promising for next-generation thin-fi lm solar cells, demonstratingpower conversion effi ciency exceeding 25%. In particular, single-crystal perovskite materials are estimated to possess superioroptoelectronic properties that can further enhance the effi ciency. However, fabricating thin single-crystal perovskite for a lightabsorberlayer remains challenging. In this study, a 40-μm-thick single-crystalline MAPbBr 3 perovskite is fabricated by inversetemperature crystallization (ITC) with a selective seed-transfer technique. By using a separate seed growth process and a seedtransferprocess, a 16.23-mm 2 -large single domain high-quality single-crystalline MAPbBr 3 perovskite can be grown withoutadditional nucleation. The grown single-crystal MAPbBr 3 exhibits a low surface roughness of 0.51 nm and low trap density of7.61 × 10 8 cm −3 . We also fabricate solar cells with single-crystalline MAPbBr 3 using a glass substrate coated with SnO 2 andindium-tin-oxide thin fi lms. The single-crystal MAPbBr 3 -based solar cells demonstrate a power conversion effi ciency of 4.31%.

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