Small, Journal Year: 2025, Volume and Issue: unknown

Published: April 26, 2025

Abstract Obtaining high‐quality perovskite films is crucial for reducing non‐radiative recombination and improving device performance. As reported, the crystallization process of can be effectively tailored by introducing multifunctional additives. In this work, polyvinyl pyrrolidone (PVP) with varying degrees polymerization (DP) values (K15, K30, K90) are systematically screened utilized as an additive to regulate defect density control films. This regulation achieved through coordination interactions between perovskites their multi‐carbonyl groups PVP. Among selected polymers, K30 carbonyl polymer exhibits a suitable viscosity bind strength, which facilitated significant delay in intermediate phase transition accelerated nucleation. result, enhanced crystallinity, prolonged PL lifetime, no residual PbI 2 achieved. The K30‐treated MA‐free demonstrated PCE 24.16% remarkable V OC 1.2 V. Moreover, strategy extended RbCsFAMA quadruple‐cation films, delivering impressive 25.35% minimal deficit 0.35 work provides effective approach modulate crystal growth highlights significance DP polymeric

Language: Английский