Stopping Phase Separation Enables Durable Wide‐Bandgap Photovoltaic Perovskites
Abstract
Abstract Light‐induced halide segregation presents a fundamental barrier to the longevity of wide‐bandgap (WBG) mixed‐halide perovskites. Herein, a multifunctional ionic polymer, polyquaternium‐37, is reported as an effective grain boundary passivator to inhibit the degradation pathway. This dual‐interaction mechanism concertedly arrests halide migration at grain boundaries, thereby suppressing local electric‐field and ultimately curbing light‐induced phase separation. Consequently, the modified WBG perovskites demonstrate robust photostability under light stress. The champion inverted perovskite photovoltaic device delivers a power conversion efficiency (PCE) of 22.86% under AM 1.5G illumination and an outstanding indoor PCE of 43.19% under 1000 lux. Remarkably, the modified device exhibits a projected T 90 lifetime exceeding 10 000 h under continuous indoor light cycling. This work pioneers a facile solution to halide segregation via grain boundary engineering, paving the way for operationally stable WBG perovskite photovoltaics.
Article Details
Authors (12)
Xiao‐Ying He
State Key Laboratory of Bioinspired Interfacial Materials Science Institute of Functional Nano & Soft Materials (FUNSOM) Soochow University Suzhou China
Bin Song
Kai‐Li Wang
Institute of Functional Nano & Soft Materials (FUNSOM) State Key Laboratory of Bioinspired Interfacial Materials Science Soochow University Suzhou China
Nan Li
Lei Huang
BLSA-ZJU Research Center and Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, China.
Rui‐Hao Qin
State Key Laboratory of Bioinspired Interfacial Materials Science Institute of Functional Nano & Soft Materials (FUNSOM) Soochow University Suzhou China
Jing Chen
Chun‐Hao Chen
Institute of Functional Nano & Soft Materials (FUNSOM) State Key Laboratory of Bioinspired Interfacial Materials Science Soochow University Suzhou China
Yu Xia
Ilhan Yavuz
Yan‐Hui Lou
College of Energy Soochow Institute for Energy and Materials Innovations Soochow University Suzhou China
Zhao‐Kui Wang
Institute of Functional Nano & Soft Materials (FUNSOM) State Key Laboratory of Bioinspired Interfacial Materials Science Soochow University Suzhou China