Precise control on the crystallization with co-anti-solvents in wide-bandgap perovskite film for efficient perovskite-organic tandem solar cells

Abstract

Constructing tandem solar cells (TSCs) is a strategy to enhance the power conversion efficiency (PCE) of single-junction photovoltaic technologies. Herein, efficient four-terminal (4T) perovskite-organic TSCs are developed via precise control over the crystallization with co-anti-solvents in wide-bandgap perovskite (FA_0.8Cs_0.2Pb(I_0.6Br_0.4)₃, energy gap: 1.77 eV) film. High-quality perovskite films can be achieved by employing a sophisticated co-anti-solvent technique, which effectively enhances the perovskite crystallinity with large grain size and suppresses the nonradiative recombination with pinhole-free surfaces. The results demonstrate that co-anti-solvents with a low boiling point polarity and nonpolar solvent contribute to superior performance of devices. The wide bandgap semi-transparent perovskite solar cell (ST-PSC) fabricated using co-anti-solvent exhibited a remarkable efficiency of 14.52%, and we successfully obtained an efficiency of 22.5% for 4T perovskite-organic TSC. These findings inspire bright futures that TSCs could facilitate the development of more effective and sustainable solar energy solutions.

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