Sequential Organic Ligand Modifications to Dedicatedly Restructure Grain Boundary and Surface of Perovskites.

ABSTRACT: The durability of perovskite solar cells (PSCs) is substantially limited by defects and imperfect structures at grain boundaries (GBs) and grain surfaces (GSs) of perovskites, where common single-step ligand passivation struggles due to ligand heterogeneous distributions and distinct chemical environments. Herein, we demonstrate a two-step sequential dedicated-ligand (TSS-DL) strategy that selectively targets GBs and GSs through spatially resolved interactions of the dedicated ligands. We identified two classes of dedicated ligands, including Ligand X, notably 2,2-difluoroacetamide bromide (DFABr) for GBs to restructure them into stable 2D perovskites and suppress defects, and Ligand Y, featuring 4-aminopiperidinium dibromide (4APPBr₂) for GSs to create a rigid 2D perovskite ove

SUBMITTER: Ahmad S 

PROVIDER: S-EPMC12749784 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature