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Performance Enhancement of All-Inorganic CsPbI3 Perovskite Solar Cells through Functional Additive and Buried
Hengzhuo Cai1, Junfeng Lin1, Wanyang Lyu1
1Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou, China.
All-inorganic perovskite solar cells (IPSCs) show promise but suffer instability. A new method uses oxamide and potassium tartrate to improve CsPbI3 film crystallization and interfaces, boosting efficiency and durability.
Area of Science:
- Materials Science
- Renewable Energy
- Solid-State Chemistry
Background:
- All-inorganic CsPbI3 perovskite solar cells (IPSCs) offer excellent bandgap and thermal stability.
- Phase instability and interfacial defects limit their practical application and durability.
Purpose of the Study:
- To develop a low-temperature synergistic strategy to enhance the stability and performance of CsPbI3-based IPSCs.
- To address intrinsic phase instability and interfacial defects in CsPbI3 films.
Main Methods:
- Combined oxamide additive with potassium tartrate interfacial modification.
- Optimized bulk crystallization and interface properties of CsPbI3 films.
- Investigated defect suppression, crystal growth, recombination, energy-level alignment, and carrier extraction.
Main Results:
- Oxamide suppressed iodide vacancy defects and non-radiative recombination, promoting uniform crystal growth.
- Potassium tartrate passivated interfacial traps and improved carrier extraction.
- Achieved a power conversion efficiency of 18.89% with enhanced environmental stability.
Conclusions:
- The synergistic strategy effectively addresses phase instability and interfacial defects in CsPbI3-based IPSCs.
- This approach offers a simple, scalable solution for improving IPSC performance and durability.
- The modified CsPbI3 solar cells demonstrate significant potential for commercial applications.
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