Eliminating Halogen Vacancies Enables Efficient MACL-Assisted Formamidine Perovskite Solar Cells.

ABSTRACT: Methylammonium chloride (MACl) additive is almost irreplaceable in high-performance formamidine perovskite photovoltaics. Nevertheless, Some of the problems that can arise from adding MACl are rarely mentioned. Herein, it is proposed for the first time that the addition of MACl would cause the non-stoichiometric ratio in the perovskite film, resulting in the halogen vacancy. It is demonstrated that the non-synchronous volatilization of methylamine cations and chloride ions leads to the formation of halogen vacancy defects. To solve this problem, the NH₄ HCOO is introduced into the perovskite precursor solution to passivate the halogen vacancy. The HCOO^- ions have a strong force with lead ions and can fill the halogen vacancy defects. Consequently, the champion devices

SUBMITTER: Liu Z 

PROVIDER: S-EPMC10870047 | biostudies-literature | 2024 Feb

REPOSITORIES: biostudies-literature