Eutectic Urea Phosphate Suppresses Phase Segregation in Wide‐Bandgap Photovoltaic Perovskites
Abstract
ABSTRACT Compositional segregation resulting from non‐uniform crystallization remains a critical bottleneck limiting the performance of wide‐bandgap (WBG) mixed‐halide perovskite photovoltaics. Herein, we report a halide‐specific coordination strategy by employing a eutectic molecule to stop the phase segregation in WBG perovskites. Owing to the differential affinity of stronger for bromine‐based octahedra than iodine‐based ones, the urea phosphate molecule acts as a molecular pacemaker synchronizing the crystallization of disparate perovskite phases. This strategy successfully eliminates vertical and lateral phase segregation within the films, leading to a substantial reduction in non‐radiative recombination and charge transport losses. Consequently, the champion perovskite photovoltaic devices present a power conversion efficiency (PCE) of 22.27% under AM 1.5G illumination and a promising indoor PCE of 42.64% under 1000 lux. The finding offers a robust paradigm to fabricate high‐quality WBG photovoltaic perovskites for indoor energy harvesting in the Internet of Things.
Article Details
Authors (11)
Rui‐Hao Qin
State Key Laboratory of Bioinspired Interfacial Materials Science Institute of Functional Nano & Soft Materials (FUNSOM) Soochow University Suzhou China
Chun‐Hao Chen
Institute of Functional Nano & Soft Materials (FUNSOM) State Key Laboratory of Bioinspired Interfacial Materials Science Soochow University Suzhou China
Xiao‐Ying He
State Key Laboratory of Bioinspired Interfacial Materials Science Institute of Functional Nano & Soft Materials (FUNSOM) Soochow University Suzhou China
Jing Chen
Kai‐Li Wang
Institute of Functional Nano & Soft Materials (FUNSOM) State Key Laboratory of Bioinspired Interfacial Materials Science Soochow University Suzhou China
Yu‐Tong Yang
Institute of Functional Nano & Soft Materials (FUNSOM) State Key Laboratory of Bioinspired Interfacial Materials Science Soochow University Suzhou China
Xin Chen
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.
Jia‐Cheng Li
State Key Laboratory of Bioinspired Interfacial Materials Science Institute of Functional Nano & Soft Materials (FUNSOM) Soochow University Suzhou China
Yu Xia
Zhao‐Kui Wang
Institute of Functional Nano & Soft Materials (FUNSOM) State Key Laboratory of Bioinspired Interfacial Materials Science Soochow University Suzhou China