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Eliminating Residue-Induced Degradation: A Volatile Dopant Strategy for High Performance Perovskite Photovoltaics
Jinzheng Zhao1, Zihao Li1, Jingjin Dong1
1National Key Laboratory of Flexible Electronics (KLOFE), Institute of Advanced Materials and School of Flexible Electronics, Nanjing Tech University, Nanjing, Jiangsu, P. R. China.
Small (Weinheim an Der Bergstrasse, Germany)
|July 6, 2026
Summary
Researchers developed a novel residue-free dopant for perovskite solar cells. This innovation enhances conductivity and stability, boosting power conversion efficiency to 25.53% by preventing ion migration.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- High-performance perovskite solar cells need hole transport materials with high conductivity and moisture resistance.
- Lithium bis(trifluoromethanesulfonyl)imide is a common dopant for Spiro-OMeTAD but causes ion migration issues, reducing device stability.
- Ion migration from dopants like lithium negatively impacts perovskite solar cell performance and longevity.
Purpose of the Study:
- To introduce a novel, volatile dopant, ammonium bis(trifluoromethanesulfonyl)imide (AM-TFSI), as a residue-free alternative.
- To address the critical challenges of ion migration and extrinsic cation introduction in perovskite solar cells.
- To enhance both the efficiency and long-term operational stability of n-i-p perovskite solar cells.
Main Methods:
- Synthesized and utilized ammonium bis(trifluoromethanesulfonyl)imide (AM-TFSI) as a dopant for the Spiro-OMeTAD hole transport layer.
- Investigated the volatilization properties of AM-TFSI, confirming negligible ionic residues post-doping.
- Fabricated n-i-p perovskite solar cells using the AM-TFSI doped hole transport material and evaluated their performance and stability.
Main Results:
- The residue-free AM-TFSI dopant effectively prevents cationic residue migration during device operation.
- Hole mobility was significantly improved, and extrinsic cation introduction into the perovskite lattice was avoided.
- Optimized devices achieved a power conversion efficiency of 25.53% and demonstrated markedly improved operational stability.
Conclusions:
- Ammonium bis(trifluoromethanesulfonyl)imide offers a simple and effective residue-free doping strategy for perovskite solar cells.
- This approach successfully mitigates ion migration issues, enhancing device efficiency and durability.
- The developed method presents a promising pathway for advancing stable and high-performance perovskite photovoltaics.
