Potassium Cyanate Stabilizes Lattice and Promotes Preferred Orientation for 1.67‐eV Wide‐Bandgap Perovskite and Perovskite/Silicon Tandems
Abstract
ABSTRACT Wide‐bandgap (WBG) perovskite solar cells are crucial for efficient perovskite/silicon tandem solar cells (PSTSCs). However, they often suffer from uncontrolled crystallization, phase instability, and non‐radiative recombination losses due to crystallographic defects. Here, we report a facile strategy of regulating perovskite crystallization and passivating uncoordinated lead ions and halide vacancies by adding potassium cyanate (KOCN) into the perovskite precursor, which incorporates into the perovskite lattice to thereby suppressing non‐radiative recombination. Moreover, KOCN modulates nucleation to promote a (110) orientation and releases strain. Consequently, KOCN‐based 1.67 eV‐WBG perovskite devices yield a champion efficiency of 23.60% with an impressive open‐circuit voltage of 1.263 V and fill factor of 84.39%, enabling a 31.10% efficiency in two‐terminal PSTSCs. After 1600 h of aging in the glovebox, the KOCN‐doped device retains over 98% of its initial efficiency.
Article Details
Authors (23)
Shenghan Wu
Zilong Wu
Jiawen Li
Lang Yu
Zhicheng Song
Institute of Flexible Electronics (IFE, Future Technologies), State Key Laboratory of Vaccines for Infectious Diseases, Xiang An Biomedicine Laboratory
Shengkai Kang
College of Materials Science and Engineering & Institute of New Energy and Low‐Carbon Technology & Engineering Research Center of Alternative Energy Materials & Devices Ministry of Education Sichuan University Chengdu China
Zhengming Ma
College of Materials Science and Engineering & Institute of New Energy and Low‐Carbon Technology & Engineering Research Center of Alternative Energy Materials & Devices Ministry of Education Sichuan University Chengdu China
Xiaoxue Wang
Xinyu Ma
Jiangsu Engineering Laboratory of Novel Functional Polymeric Materials, Jiangsu Key Laboratory of Advanced Negative Carbon Technologies, Suzhou Key Laboratory of Soft Material and New Energy, College of Chemistry, Chemical Engineering and Materials Science
Jun Wu
Dinghao Ma
Yao Chen
Haihe Laboratory of Sustainable Chemical Transformations
Chunyang Yin
Jingwei Xue
State Key Laboratory of Oil and Gas Equipment CNPC Tubular Goods Research Institute Xi'an China
Sai Bai
Hao Huang
Fang Yao
Wenwu Wang
State Key Laboratory of Fabrication Technologies for Integrated Circuits, Institute of Microelectronics of the Chinese Academy of Sciences (IMECAS) , Beijing 100029,
Shengqiang Ren
Yuchao Hu
Tongwei Solar (Chengdu) Ltd Chengdu China
Cong Chen
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.
Long Jiang
Dewei Zhao