Stabilization of FAPbI3 with Multifunctional Alkali‐Functionalized Polymer

• DOI: 10.1002/adma.202211619
• Publication Date: 2023-04-06T07:18:58Z
• Authors: Chenxu Zhao; Hong Zhang; Masaud Almalki; Jia Xu; Anurag Krishna; Felix T. Eickemeyer; Jing Gao; Yu Mao Wu; Shaik M. Zakeeruddin; Junhao Chu; Jianxi Yao; Michael Grätzel
• Keywords: Passivation; Rubidium; Acrylic acid

The defects located at the interfaces and grain boundaries (GBs) of perovskite films are detrimental to photovoltaic performance stability solar cells. Manipulating crystallization process tailoring with molecular passivators main effective strategies mitigate loss instability. Herein, a new strategy is reported manipulate FAPbI3 -rich by incorporating small amount alkali-functionalized polymers into antisolvent solution. synergic effects alkali cations poly(acrylic acid) anion effectively passivate on surface GBs films. As result, rubidium (Rb)-functionalized significantly improves power conversion efficiency cells approaching 25% reduces risk lead ion (Pb2+ ) leakage continuously via strong interaction between CO bonds Pb2+ . In addition, unencapsulated device shows enhanced operational stability, retaining 80% its initial after 500 h operation maximum point under one-sun illumination.