Suppressing Halide Segregation in Wide-Bandgap Perovskite Absorbers by Transamination of Formamidinium.

ABSTRACT: All-perovskite tandem solar cells are emerging at a fast rate because of their potential to exceed efficiencies of Si-perovskite tandems, in combination with faster manufacturing, lower cost, and the ability to be processed on flexible substrates. Mixing halides is a key to achieve wide-bandgap absorbers, which however suffer from halide segregation under illumination, resulting in lowering of the bandgap. To tackle this problem, butylamine (BA) has been added to the perovskite precursor solution and is found to react with the formamidinium (FA) cation, producing N-butylformamidinium (BuFA⁺), which accumulates at the perovskite surface and grain boundaries. The creation of the BuFA cation results in suppressed halide segregation and improved crystallization. Density functional t

SUBMITTER: Loukeris G 

PROVIDER: S-EPMC12321281 | biostudies-literature | 2025 Aug

REPOSITORIES: biostudies-literature