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Regulating the electrode potential offset in perovskite solar cells for boosting interfacial charge transfer
Qiong Wang1, Mengfan Xue2, Kaijian Zhu3
1Eco-materials and Renewable Energy Research Center (ERERC), Jiangsu Key Laboratory for Nano Technology, National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China.
Physical Chemistry Chemical Physics : PCCP
|January 20, 2026
Summary
Researchers introduced electrode potential offset (ΔEPO) to enhance perovskite solar cell (PSC) efficiency, improving device performance from 0.6% to 18.1%. This new descriptor offers a novel design principle for PSC interfaces.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- Perovskite solar cells (PSCs) utilize band offsets for interfacial charge transfer.
- Existing models fail to explain all observed interfacial charge transfer phenomena in PSCs.
Purpose of the Study:
- To investigate the electrode potential offset (ΔEPO) at the perovskite/hole transport layer (HTL) interface.
- To establish ΔEPO as a descriptor for interfacial charge transfer in PSCs.
- To enhance PSC device efficiency through interface engineering.
Main Methods:
- Employing different side chain HTLs to tune ΔEPO.
- Utilizing in situ FTIR, NMR, theoretical calculations, and electrochemical measurements.
- Analyzing chemical reaction kinetics at the perovskite/HTL interface.
Main Results:
- Adjusting ΔEPO significantly increased PSC device efficiency from 0.6% to 18.1%.
- A direct relationship was found between chemical reaction kinetics and ΔEPO.
- ΔEPO was identified as a driving force for interfacial charge transfer.
Conclusions:
- Electrode potential offset (ΔEPO) is a crucial factor in PSC interfacial charge transfer.
- ΔEPO serves as a new descriptor for designing PSC interfaces.
- This research provides a deeper understanding and a new design strategy for PSCs.
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