Synergistic Management of Crystallization and Defects in Tin‐Lead Perovskites towards Efficient All‐Perovskite Tandem Solar Cells
Abstract
ABSTRACT Low‐bandgap mixed tin–lead (Sn–Pb) perovskites are promising near‐infrared absorbers for all‐perovskite tandem solar cells (APTSCs), but suffer from Sn‐related defects, ion migration, and poor crystallinity. Herein, we developed a synergistic dual‐molecule additive strategy by incorporating aminoguanidine sulfate (AGS) and L‐alanine hydrochloride (AHC) into the Sn–Pb perovskite precursor. The guanidine moieties of AGS bonded to Sn vacancies to inhibit the oxidation of Sn 2+ and formed hydrogen bonds with formamidinium (FA + ) to immobilize its migration. Besides, the ionic hydrogen bonds between AHC and the perovskite components slowed down the crystallization process of perovskite and inhibited halide ion migration. Importantly, the specific interaction between AGS and AHC enabled a uniform distribution of the additives and provided efficient defect passivation at grain boundaries. This synergy regulated the film formation kinetics, promoted preferred orientation growth, and enhanced crystallinity, thereby reducing non‐radiative recombination and ion migration. As a result, our Sn–Pb perovskite solar cells achieved an efficiency of up to 23.44%. Furthermore, we demonstrated a champion efficiency of 29.36% (certified 28.57%) for APTSCs.
Article Details
Authors (23)
Jiayu You
College of Materials Science and Engineering & Engineering Research Center of Alternative Energy Materials and Devices, Ministry of Education
Yi Luo
State Key Laboratory of Green Chemical Engineering and Industrial Catalysis
Juncheng Wang
Ruohao Wang
Southwest United Graduate School, National Center for International Joint Research of Photoelectric Energy Materials and Application, School of Materials and Energy Yunnan University Kunming China
Zhiyu Gao
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
Jialun Jin
Shenghan Wu
Wenbo Jiao
Hao Zhang
Hao Huang
Dinghao Ma
Yanqing Yao
Shining Zhang
Institute of Power Energy Innovation North China Electric Power University Beijing 102206 P.R. China
Shun Zhou
Peng Cui
MOE Key Laboratory of Functionalized Molecular Solids, Anhui Laboratory of Molecule-Based Materials, College of Chemistry and Materials Science
Xing Zhao
John A. Paulson School of Engineering and Applied Sciences
Xinxing Yin
Chuanxiao Xiao
Wen‐Hua Zhang
Southwest United Graduate School, National Center for International Joint Research of Photoelectric Energy Materials and Application, School of Materials and Energy Yunnan University Kunming China
Martin Stolterfoht
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