Printable High-efficiency and Stable FAPbBr 3 Perovskite Solar Cells for Multifunctional Building-integrated Photovoltaics.

Perovskite solar cells (PSCs) show great promise for next-generation building-integrated photovoltaic (BIPV) applications because of their abundance of raw materials, adjustable transparency, and cost-effective printable processing. Owing to the complex perovskite nucleation and growth control, the fabrication of large-area perovskite films for high-performance printed PSCs is still under active investigation. Herein, we propose an intermediate-phase-transition-assisted one-step blade coating for an intrinsic transparent formamidinium lead bromide (FAPbBr 3 ) perovskite film. The intermediate complex optimized the crystal growth path of FAPbBr 3 , resulting in a large-area, homogeneous, and dense absorber film. A champion efficiency of 10.86% with high open-circuit voltage up to 1.57 V was obtained with a simplified device architecture of glass/FTO/SnO 2 /FAPbBr 3 /carbon. Moreover, the unencapsulated devices maintained 90% of their initial power conversion efficiency after aging at 75°C for 1000 h in ambient air, and 96% after maximum power point tracking for 500 h. The printed semitransparent PSCs, with average visible light transmittance over 45%, demonstrated high efficiencies for both small devices (8.6%) and 10 × 10 cm 2 modules (5.55%). Finally, the ability to customize the color, transparency, and thermal insulation properties of FAPbBr 3 PSCs makes them high prospects as multifunctional BIPVs. This article is protected by copyright. All rights reserved.