Addition of Ammonium Thiocyanate Alters the Microstructure and Energetic Landscape of 2D/3D Perovskite Films

Abstract

Mixtures of low-dimensional and 3D perovskite phases have attracted significant attention due to their improved stability with respect to purely 3D perovskites. One of the strategies to gain control over the complex crystallization of these 2D/3D perovskite films and obtain well-ordered thin films is through the additive engineering of the precursor solution. In this work, the influence of ammonium thiocyanate addition on the microstructural and optical properties of thin films of (PEA)2(MA)n−1PbnI3n+1 is investigated for different n values. Apart from improving the texture of the thin films, it was found that the addition of ammonium thiocyanate also impacts the morphology and energetic landscape in (PEA)2(MA)n−1PbnI3n+1