Confined Growth of High-quality Single-Crystal MAPbBr3 by Inverse Temperature Crystallization for Photovoltaic Applications

Organic-inorganic hybrid halide perovskite solar cells are promising for next-generation thin-film solar cells, demonstrating power conversion efficiency exceeding 25%. In particular, single-crystal perovskite materials are estimated to possess superior optoelectronic properties that can further enhance the efficiency. However, fabricating thin single-crystal perovskite for a light-absorber layer remains challenging. In this study, a 40-mu m-thick single-crystalline MAPbBr(3) perovskite is fabricated by inverse temperature crystallization (ITC) with a selective seed-transfer technique. By using a separate seed growth process and a seed-transfer process, a 16.23-mm(2)-large single domain high-quality single-crystalline MAPbBr(3) perovskite can be grown without additional nucleation. The grown single-crystal MAPbBr(3) exhibits a low surface roughness of 0.51 nm and low trap density of 7.61 x 10(8) cm(-3). We also fabricate solar cells with single-crystalline MAPbBr(3) using a glass substrate coated with SnO2 and indium-tin-oxide thin films. The single-crystal MAPbBr(3)-based solar cells demonstrate a power conversion efficiency of 4.31%. [GRAPHICS] .