研究目的
To address the corrosion of perovskite films caused by acetonitrile (ACN) when used as a solvent to dissolve bis(trifluoromethane)sulfonimide lithium salt (LiTFSI) in perovskite solar cells (PSCs) by exploring alternative solvents with smaller polarity, such as isopropanol (IPA), to enhance the performance and stability of PSCs.
研究成果
Replacing ACN with IPA as a solvent for LiTFSI in PSCs mitigates the corrosion of perovskite films, reduces defects and nonradiative recombination, and enhances device performance and stability. The IPA-spiro device achieved a champion PCE of 19.43%, demonstrating the effectiveness of solvent engineering in improving PSC efficiency and durability.
研究不足
The study focuses on the solvent engineering aspect of PSCs and does not explore other potential degradation mechanisms or the long-term stability under various environmental conditions beyond ambient environment testing.
1：Experimental Design and Method Selection:
A solvent engineering approach was implemented to find suitable alternatives for ACN to dissolve LiTFSI. Various alcohols with smaller polarity (methanol, ethanol, and isopropanol) were tested.
2：Sample Selection and Data Sources:
Perovskite films were treated with solutions containing LiTFSI dissolved in different solvents (ACN, MT, ET, IPA) to observe their effects on film quality and device performance.
3：List of Experimental Equipment and Materials:
Materials included PbI2, CsI, PbBr2, MABr, FAI, DMF, DMSO, CB, LiTFSI, TBP, ACN, MT, ET, IPA, spiro-OMeTAD, and FTO substrates. Equipment included a solar simulator, FESEM, UV/Vis-NIR spectrometer, fluorescence spectrometer, and electrochemical workstation.
4：Experimental Procedures and Operational Workflow:
Perovskite films were prepared and treated with different LiTFSI solutions. Devices were fabricated and characterized for performance and stability.
5：Data Analysis Methods:
Performance metrics (PCE, VOC, JSC, FF) were measured and compared. Morphological and spectroscopic analyses were conducted to assess film quality and charge carrier dynamics.
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PbI2
TCI
Used in the preparation of perovskite precursor solution.
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CsI
TCI
Used in the preparation of perovskite precursor solution.
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PbBr2
Xian Polymer Light Technology Corp
Used in the preparation of perovskite precursor solution.
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MABr
Xian Polymer Light Technology Corp
Used in the preparation of perovskite precursor solution.
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FAI
Xian Polymer Light Technology Corp
Used in the preparation of perovskite precursor solution.
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DMF
Sigma-Aldrich
Solvent used in the preparation of perovskite precursor solution.
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DMSO
Sigma-Aldrich
Solvent used in the preparation of perovskite precursor solution.
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CB
Sigma-Aldrich
Solvent used to dissolve spiro-OMeTAD.
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LiTFSI
Sigma-Aldrich
Additive used in the spiro-OMeTAD solution to improve conductivity and hole mobility.
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TBP
Sigma-Aldrich
Additive used in the spiro-OMeTAD solution to control morphology and improve film homogeneity.
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ACN
Sigma-Aldrich
Solvent used to dissolve LiTFSI before adding to spiro-OMeTAD solution.
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MT
Shanghai Aladdin Chemical Reagent Co., Ltd
Alternative solvent tested for dissolving LiTFSI.
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ET
Shanghai Aladdin Chemical Reagent Co., Ltd
Alternative solvent tested for dissolving LiTFSI.
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IPA
Shanghai Aladdin Chemical Reagent Co., Ltd
Alternative solvent tested for dissolving LiTFSI, found to be effective in reducing perovskite film degradation.
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spiro-OMeTAD
Luminescence Technology Crop, Taiwan, China
Hole-transporting material used in perovskite solar cells.
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FTO
Pilkington
Conductive glass substrate used in the fabrication of perovskite solar cells.
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