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Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance
Published on: February 27, 2017
19.1K
Thermal Stability-Enhanced and High-Efficiency Planar Perovskite Solar Cells with Interface Passivation
Weihai Zhang1, Juan Xiong, Li Jiang
1School of Energy and Environment, City University of Hong Kong , Tat Chee Avenue, Kowloon, Hong Kong.
ACS Applied Materials & Interfaces
|October 14, 2017
Summary
This study enhances perovskite solar cell efficiency using zinc oxide electron transport layers. A novel annealing method and PCBM passivation achieved a record 19.1% power conversion efficiency, improving stability.
Area of Science:
- Materials Science
- Renewable Energy
- Semiconductor Physics
Background:
- Zinc oxide (ZnO) is a promising electron transport layer (ETL) for perovskite solar cells due to its favorable properties.
- However, ZnO's reactivity with methylamine in perovskites and resulting performance degradation limit device efficiency and stability.
Purpose of the Study:
- To develop improved fabrication methods for ZnO-based perovskite solar cells.
- To enhance the efficiency and thermal stability of these devices.
Main Methods:
- A novel multistep annealing method was employed to create porous PbI2 films, improving perovskite layer quality.
- Solution processing at <150 °C was used for cell fabrication.
- A thin layer of PCBM was inserted between ZnO and the perovskite to passivate the surface.
Main Results:
- The novel annealing method increased power conversion efficiency (PCE) from 15.5% to 17.5%.
- PCBM passivation further boosted PCE to 19.1%, a record for ZnO-based perovskite solar cells.
- PCBM modification significantly improved the thermal stability of the perovskite layer.
Conclusions:
- ZnO is a viable and promising electron transport material for high-performance perovskite solar cells.
- The developed multistep annealing and PCBM passivation strategies effectively enhance device efficiency and stability.
- This work paves the way for future applications of ZnO in stable and efficient perovskite solar technology.
