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Moisture-responsive crystallization strategy for efficient CsPbI3 solar cells fabricated under high-humidity
Weideren Dai1,2, Jinhua Li3, Yanzhuo Gou1
1Key Laboratory for the Green Preparation and Application of Functional Materials and College of New Energy and Electrical Engineering, Hubei University, Wuhan, China.
This study introduces a moisture-responsive crystallization strategy using propyltriethoxysilane (PTES) to improve cesium lead iodide (CsPbI3) perovskite solar cells. PTES enhances film quality and stability, leading to high power conversion efficiencies.
Area of Science:
- Materials Science
- Solid-State Chemistry
- Renewable Energy
Background:
- Cesium lead iodide (CsPbI3) perovskites suffer from intrinsic phase instability, limiting their practical application in solar cells.
- The Cs+/DMA+ ion exchange during CsPbI3 nucleation is crucial for film quality.
- Stringent fabrication conditions are currently required for CsPbI3 perovskite deployment.
Purpose of the Study:
- To develop a fabrication strategy for CsPbI3 perovskites that overcomes phase instability under ambient conditions.
- To improve the power conversion efficiency (PCE) and operational stability of CsPbI3 perovskite solar cells (PSCs).
- To investigate the role of propyltriethoxysilane (PTES) in mediating CsPbI3 crystallization.
Main Methods:
- Utilized a moisture-responsive crystallization strategy with propyltriethoxysilane (PTES) for CsPbI3 deposition under ambient air (55% relative humidity).
- Investigated the interaction of PTES siloxane groups with DMA+ in the intermediate DMAPbI3 phase.
- Fabricated CsPbI3 PSCs using the PTES-mediated method and varied humidity conditions (55% RH, 25% RH) and N2 atmosphere processing.
Main Results:
- PTES facilitated DMA+ extraction and Cs+ incorporation, accelerating CsPbI3 crystallization kinetics.
- CsPbI3 PSCs fabricated at 55% RH achieved a PCE of 21.00% with a fill factor (FF) of 86.1%.
- Higher PCEs of 21.85% and 22.60% (certified 22.02%) were obtained at 25% RH and with N2 atmosphere processing, respectively.
- PTES-treated devices demonstrated excellent operational stability under ambient conditions.
Conclusions:
- The moisture-responsive crystallization strategy using PTES effectively addresses the phase instability of CsPbI3 perovskites.
- This method enables the fabrication of high-efficiency and stable CsPbI3 PSCs under ambient conditions.
- PTES shows promise for scalable and cost-effective production of perovskite solar cells.
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