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Ion-Mediated Self-Healing Strategy Enabling Efficient and Stable ETL-Free Perovskite Solar Cells
Mengjiao Lan1, Jiakang Zhang1, Cheng Peng1
1College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao, 266042, P.R. China.
Angewandte Chemie (International Ed. in English)
|September 1, 2025
Summary
Electron transport layer-free perovskite solar cells achieve 22.97% efficiency using an indium sulfate self-healing layer. This innovation enhances stability and performance for cost-effective solar energy applications.
Area of Science:
- Materials Science
- Renewable Energy
- Nanotechnology
Background:
- Perovskite solar cells (PSCs) are promising for low-cost, efficient solar energy conversion.
- Electron transport layer-free PSCs offer simplified fabrication but suffer from performance limitations.
- Non-radiative recombination and poor band alignment hinder ETL-free PSC device performance.
Purpose of the Study:
- To develop a novel self-healing strategy for ETL-free PSCs.
- To improve charge carrier dynamics and interfacial properties in ETL-free PSCs.
- To enhance the power conversion efficiency and operational stability of ETL-free PSCs.
Main Methods:
- Introduction of an indium sulfate (In2(SO4)3) functional layer at the perovskite buried interface.
- Utilizing In3+ gradient doping as a redox buffer for self-healing.
- Investigating the ion-mediated self-healing redox dynamic cycle (In3+/In+ and Pb0/Pb2+, I0/I-).
Main Results:
- Achieved a high power conversion efficiency of 22.97% in ETL-free PSCs.
- Indium sulfate incorporation improved contact properties and band energy alignment at the ITO/perovskite interface.
- The device demonstrated excellent stability, retaining 91.6% efficiency after 1200 hours of continuous illumination.
Conclusions:
- The ion-mediated self-healing strategy effectively addresses performance limitations in ETL-free PSCs.
- Indium sulfate functionalization offers a viable pathway for developing stable and efficient perovskite solar cells.
- This work provides valuable insights for advancing ETL-free perovskite solar cell technology.
