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CsPbI3-Based Phase-Stable 2D Ruddlesden-Popper Perovskites for Efficient Solar Cells
Zhiyuan Xu1, Ling Li2, Xiyue Dong1
1The Centre of Nanoscale Science and Technology and Key Laboratory of Functional Polymer Materials, Institute of Polymer Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China.
Nano Letters
|March 22, 2022
Summary
Inorganic perovskite solar cells show promise but lack stability. New 2D Ruddlesden-Popper perovskites using thiophene spacers enhance phase stability and achieve record 16.00% efficiency.
Area of Science:
- Materials Science
- Renewable Energy
- Solid-State Chemistry
Background:
- Inorganic CsPbI3 perovskites offer potential for stable solar cells due to their lack of volatile organic components.
- However, their practical application is limited by poor phase stability under ambient conditions, attributed to the small ionic radius of Cs+.
- This instability necessitates strategies to enhance the structural integrity of CsPbI3-based materials.
Purpose of the Study:
- To develop phase-stable inorganic CsPbI3-based perovskites for high-performance solar cells.
- To investigate the use of 2D Ruddlesden-Popper (RP) structures with thiophene-based aromatic spacers to improve CsPbI3 stability.
- To evaluate the efficiency and long-term stability of the newly developed perovskite materials.
Main Methods:
- Synthesis of 2D Ruddlesden-Popper (RP) perovskites incorporating inorganic CsPbI3 with thiophene-based aromatic spacers: 2-thiophenemethylamine hydroiodide (ThMA) and 2-thiopheneformamidine hydroiodide (ThFA).
- Structural characterization and phase stability assessment of the synthesized materials under ambient and elevated temperature conditions.
- Fabrication and performance testing of solar cell devices based on the optimized 2D RP perovskite formulations, including efficiency and long-term operational stability measurements.
Main Results:
- The incorporation of ThMA and ThFA as spacers in 2D RP CsPbI3 structures significantly enhanced phase stability by mitigating internal stress.
- The optimized 2D RP perovskite device (n=5, ThFA-Cs) achieved a record power conversion efficiency of 16.00%.
- The ThFA-Cs devices demonstrated excellent long-term stability, retaining 98% of their initial efficiency after 3000 hours at room temperature and 92% after 960 hours at 80 °C.
Conclusions:
- Reduced-dimensionality 2D RP perovskites utilizing thiophene-based spacers offer a viable strategy for achieving phase-stable inorganic CsPbI3 solar cells.
- The developed ThFA-Cs material exhibits remarkable efficiency and exceptional operational stability, paving the way for practical applications.
- This research provides a new avenue for designing dimensionally engineered, stable perovskite materials for next-generation photovoltaics.
