Customized Multifunctional Additive Regulates 1.67 eV‐Wide‐Bandgap Perovskite Crystallization for Four‐Terminal Perovskite/Silicon Tandem Solar Cells
Abstract
Abstract Wide‐bandgap (WBG) perovskite solar cells (PSCs, E g > 1.6 eV), serving as the top cell in perovskite/silicon tandem solar cells (PSTSCs), play an indispensable role in absorbing high energy photons and increasing overall efficiency. However, WBG PSCs often suffer from severe light‐induced phase segregation and significant non‐radiative recombination losses due to uncontrolled rapid crystallization. Here, polyfluoride molecular additives are designed and incorporated via (diacetoxyiodo)benzene into WBG perovskite, to regulate crystallization process of perovskite films and thereby reduce defects. (Bis(trifluoroacetoxy)iodo)benzene (BTFIB) can passivate uncoordinated lead ions and iodide vacancies, thereby inhibiting phase separation caused by iodide migration and reducing non‐radiative recombination loss during charge transport. Moreover, the introduction of BTFIB can effectively moderate the film formation process and confer excellent hydrophobic properties to the films. Consequently, BTFIB‐based 1.67 eV‐WBG perovskite devices yield a champion efficiency of 23.05% (certified efficiency of 22.21%), enabling a 31.20% efficiency in four‐terminal PSTSCs, along with excellent open‐circuit voltage of 1.246 V and fill factor of 85.34%. After 2500 h of aging in a glovebox, the device retained 80% of its initial efficiency.
Article Details
Authors (18)
Shenghan Wu
Mingming Hu
Juncheng Wang
Jingwei Zhu
Wenbo Jiao
Zilong Wu
Zhicheng Song
Institute of Flexible Electronics (IFE, Future Technologies), State Key Laboratory of Vaccines for Infectious Diseases, Xiang An Biomedicine Laboratory
Yi Luo
State Key Laboratory of Green Chemical Engineering and Industrial Catalysis
Jiayu You
College of Materials Science and Engineering & Engineering Research Center of Alternative Energy Materials and Devices, Ministry of Education
Yuliang Xu
Department of Natural Product Chemistry, Key Laboratory of Chemical Biology (Ministry of Education) and State Key Laboratory of Discovery and Utilization of Functional Components in Traditional Chinese Medicine, Shandong University
Zhiyu Gao
College of Materials Science and Engineering & Engineering Research Center of Alternative Energy Materials and Devices, Ministry of Education
Zhihao Zhang
Junyu Qu
College of Materials Science and Engineering & Engineering Research Center of Alternative Energy Materials and Devices, Ministry of Education
Peng Jiang
Xia Hao
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 610065 China
Shengqiang Ren
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.
Dewei Zhao