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Updated: Jun 24, 2025
Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance
Published on: February 27, 2017
Synergistic Passivation on Buried Interface for Highly Efficient and Stable p-i-n Perovskite Solar Cells
Kai Wang1, Bo Yu2, Changqing Lin3
1Guangdong Provincial Engineering Laboratory for Wide Bandgap Semiconductor Materials and Devices, School of Electronics and Information Engineering, South China University of Technology, Guangzhou, 510640, China.
A novel interface strategy using potassium 1-trifluoroboratomethylpiperidine (3FPIP) enhances perovskite solar cell (PVSC) performance and stability. This method improves charge transfer and passivates defects, leading to a 24.6% efficiency and excellent long-term durability.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- The performance and stability of perovskite solar cells (PVSCs) are critically dependent on the interface properties between the hole transport layer (HTL) and the perovskite layer.
- The buried interface, in particular, presents challenges for efficient charge transfer and defect passivation.
Purpose of the Study:
- To develop a molecular strategy for modifying the perovskite bottom interface to enhance charge transfer and energy level alignment.
- To improve the performance and ambient stability of perovskite solar cells through interface engineering.
Main Methods:
- A molecular strategy using potassium 1-trifluoroboratomethylpiperidine (3FPIP) was employed to modify the perovskite bottom interface.
- The interaction of BF3- in 3FPIP with undercoordinated Pb2+ was utilized to passivate iodine vacancies.
- K+ ions were infiltrated into perovskite to enhance crystallinity and stability.
Main Results:
- The modified interface strategy significantly improved charge transfer capability and balanced energy levels between the HTL and perovskite layer.
- Perovskite solar cells with the buried interface treatment achieved a champion power conversion efficiency of 24.6%.
- The treated devices demonstrated outstanding ambient stability, retaining 92% of their initial efficiency after 1200 hours.
Conclusions:
- The 3FPIP-assisted interface modification is an effective method for enhancing both the performance and stability of perovskite solar cells.
- This work introduces a novel approach to buried interface engineering in PVSCs, leveraging functional group synergy for improved device characteristics.
