Complementary Dual‐Stage Modulation via Ionic‐Electrostatic Interactions for Highest Efficiency 2.03 eV Perovskite Device and Triple‐Junction Tandems
Source abstract
Abstract
ABSTRACT Ultra‐wide bandgap (UBG >2 eV) perovskites are notoriously plagued by rapid crystallization for high defect densities produced that have so far precluded their use as the top cell in triple‐junction tandem solar cells (TSCs). Herein, we introduce ammonium benzenesulfonate (ABS) as a molecular electrostatic “handle” that is active in two complementary stages of film formation. During crystallization, ABS slows nucleation rate and suppresses bulk defect generation; during post‐treatment it drives surface‐ion rearrangement that simultaneously passivates cation vacancies and eliminates interstitial halide defects. Collectively, this complementary dual‐stage modulation (CDM) yields strain‐relaxed films with reduced non‐radiative recombination, prolonged carrier lifetimes, and efficient charge extraction. Consequently, single‐junction 2.03 eV devices deliver 15% power conversion efficiency ranking among the highest reported for >2.0 eV perovskites, while monolithic perovskite/perovskite/silicon triple‐junction TSCs reach 24.4%, both with substantially improved operational and thermal stability. This work establishes electrostatically mediated, multi‐stage processing as a general route to ultra‐wide‐bandgap absorbers for next‐generation photovoltaics.
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Research context
OpenAlex topics: Perovskite Materials and Applications · solar cell performance optimization · Ga2O3 and related materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Hebei Key Laboratory of Inorganic Nanomaterials Hebei Technology Innovation Center for Energy Conversion Materials and Devices Engineering Research Center of Thin Film Solar Cell Materials and Devices Hebei Province College of Chemistry and Material Science Hebei Normal University Shijiazhuang Hebei China
State Key Laboratory of Photoelectric Conversion and Utilization of Solar Energy State Key Laboratory of Chemical Reaction Dynamics Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian Liaoning China
Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing China
EIT Data Science and Communication College Zhejiang Yuexiu University Shaoxing Zhejiang China
School of New Energy Yulin University Yulin Shaanxi China
Yingkou Jinchen Machinery Co., Ltd Yingkou Liaoning China
School of Materials Science and Engineering Shaanxi Normal University Xi’an China
Funding
Chinese Academy of Sciences · National Natural Science Foundation of China · Higher Education Discipline Innovation Project · Fundamental Research Funds for the Central Universities
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