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Updated: Jul 27, 2025
Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance
Published on: February 27, 2017
Interface Modification for Efficient and Stable Inverted Inorganic Perovskite Solar Cells.
Tianfei Xu1, Wanchun Xiang1, Junjie Yang2
1Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, Shaanxi Key Laboratory for Advanced Energy Devices, Shaanxi Engineering Lab for Advanced Energy Technology, School of Materials Science and Engineering, Shaanxi Normal University, Xi'an, 710119, China.
Interface engineering with 2-mercapto-1-methylimidazole (MMI) significantly boosts inverted inorganic perovskite solar cells (PSCs). This method enhances stability and power conversion efficiency (PCE) by reducing defects and improving charge transfer.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- Inorganic perovskite solar cells (PSCs) with inverted structures are promising for tandem applications due to thermal stability and bandgap properties.
- Current inverted PSCs show lower power conversion efficiency (PCE) compared to conventional PSCs, attributed to interfacial energy level misalignment and charge recombination.
- Addressing these limitations is crucial for advancing inverted PSC technology.
Purpose of the Study:
- To enhance the performance and stability of inverted inorganic perovskite solar cells (PSCs).
- To investigate the effect of interfacial engineering using 2-mercapto-1-methylimidazole (MMI) on CsPbI3-xBrx films.
- To improve energy level alignment and reduce charge recombination in inverted PSCs.
Main Methods:
- Interfacial modification of CsPbI3-xBrx films using 2-mercapto-1-methylimidazole (MMI).
- Analysis of the interaction between MMI's mercapto group and undercoordinated Pb2+ in perovskite.
- Evaluation of energy level alignment with electron-transporting materials and charge carrier dynamics.
- Performance testing of modified inverted PSCs, including power conversion efficiency (PCE) and stability assessments.
Main Results:
- MMI modification effectively passivates undercoordinated Pb2+ via Pb-S bonds, reducing surface trap density.
- Improved energy level alignment with electron-transporting layers facilitates carrier transfer and reduces voltage loss.
- Achieved a champion PCE of 20.6% for small-area (0.09 cm2) and 17.3% for large-area (1 cm2) devices.
- Demonstrated significantly enhanced ambient, operational, and thermal stability for the modified inorganic PSCs.
Conclusions:
- Interfacial engineering with MMI is a simple yet effective strategy for fabricating high-performance inverted inorganic PSCs.
- The developed approach leads to substantial improvements in both efficiency and operational stability.
- This work provides a pathway for realizing efficient and durable inverted perovskite solar cells for future energy applications.
