An Exploration of the Role of Acetamidinium Substitution in Methylammonium Lead Iodide Perovskites
Year: 2025
Type: article
Abstract: Halide perovskite (HP) versatility for optoelectronic and electrochemical applications is mainly due to their ability to engineer cation mixtures at the A‐site within the ABX 3 stoichiometry. Acetamidinium (AC + ) is a common cation used in these mixed compositions, but its effects on the material's properties have not been addressed in detail. In this work, prototypical methylammonium lead iodide (MAPbI 3 ) compositions partially substituted with AC + are synthesized and analyzed for structural, electrical, optoelectronic, and stability properties. Results reveal a solubility limit of around 10% AC + , lower than encountered in the literature, with slight effects on the phase transition temperatures. As expected, substitution with AC + significantly reduces electronic conductivity and I – V hysteresis but only marginally increases the bandgap energy. Contrary to literature results, light‐accelerated degradation tests show that AC + incorporation does not significantly enhance the materials’ stability. Among several reasons, this might be related to weak interactions between AC + cations and the inorganic framework. This study establishes the effects of AC + substitution in halide perovskites and provides insights into optimizing A‐site compositions for optoelectronic and electrochemical applications.
Source: ChemPhysChem
Authors: Fernando Brondani Minussi, Rafaela Coutinho de Oliveira Santos, Marco Antonio de Mello Teixeira, Rogério Marcos Silva, Eudes Borges Araújo
Institution: Universidade Estadual Paulista (Unesp)
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $4,550
Awards: G116629194, G3690646728, G6815844370
OpenAlex ID: W4416556237