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Surface Halide Manipulation for Stable Inorganic Perovskite Solar Cells and Modules
Xiangnan Sun1, Peikun Zhang1, Tianjun Liu2
1Key Laboratory for Intelligent Nano Materials and Devices of Ministry of Education, State Key Laboratory of Mechanics and Control for Aerospace Structures, and Institute for Frontier Science, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China.
We developed stable, efficient wide-bandgap perovskite solar cells using a surface halide substitution strategy. This approach combines the stability of chlorine-rich perovskites with the efficiency of iodine-rich perovskites, achieving high power conversion efficiency and long-term operational stability.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- Iodine-rich perovskites offer desirable bandgaps but lack polymorphic stability.
- Chlorine-rich perovskites provide thermodynamic stability but have low efficiency.
- A key challenge is balancing stability and efficiency in perovskite solar cells.
Purpose of the Study:
- To develop highly stable and efficient wide-bandgap perovskite solar cells.
- To overcome the limitations of iodine-rich and chlorine-rich perovskites.
- To enhance the long-term operational stability and environmental resistance of perovskite devices.
Main Methods:
- Fabrication of function-gradient inorganic perovskites via surface halide substitution.
- Creating a chlorine-rich protective layer over iodine-rich active layers.
- Characterization of device performance, stability under operational stress, and environmental exposure.
Main Results:
- Achieved a power conversion efficiency of 21.2% for unit cells and 19.2% for solar modules.
- Demonstrated negligible efficiency loss after 1000 hours of air storage.
- Showcased minimal degradation after 3200 hours of continuous 1-sun illumination at 40°C.
- The compositional gradient effectively mitigated ion migration and improved environmental resistance.
Conclusions:
- The surface halide substitution strategy successfully integrates the benefits of both chlorine- and iodine-rich perovskites.
- The developed function-gradient perovskite solar cells exhibit unprecedented stability for wide-bandgap devices.
- This approach offers a promising pathway for durable and efficient perovskite solar cell technology.
