研究目的
To improve the power conversion efficiency (PCE) and long-term stability of perovskite solar cells (PSCs) by introducing a π-conjugated Lewis base with polycarboxylic groups as an additive in the PbI2 solution.
研究成果
The introduction of H4abtc as a π-conjugated Lewis base additive significantly improves the PCE and stability of PSCs by passivating grain boundaries and enhancing the crystallinity of perovskite films. The optimized PSC with 2.0% H4abtc achieves a 24% enhancement in PCE compared to the control, demonstrating the potential of this method for producing efficient and stable PSCs.
研究不足
The study does not explore the long-term stability under operational conditions beyond 30 days or the scalability of the fabrication process for commercial applications.
1：Experimental Design and Method Selection:
The study employs a two-step solution method to prepare MAPbI3 perovskite films with H4abtc additive. The method involves the formation of a Lewis acid-base adduct to control the crystallization process of perovskite.
2：Sample Selection and Data Sources:
The materials used include PbI2, H4abtc, DMSO, DMF, MAI, Spiro-MeOTAD, Li-TFSI, 4-tert-butyl-pyridine, and chlorobenzene. The substrates are FTO coated glass.
3：List of Experimental Equipment and Materials:
Equipment includes a spin coater, hot plate, FTIR spectrometer, UV–visible spectrometer, X-ray diffractometer, FESEM, fluorescence spectrometer, and solar simulator. Materials include TiO2 paste, PbI2, H4abtc, DMSO, DMF, MAI, Spiro-MeOTAD, Li-TFSI, 4-tert-butyl-pyridine, and chlorobenzene.
4：Experimental Procedures and Operational Workflow:
The process involves spin-coating TiO2 layers, depositing perovskite films with or without H4abtc additive, spin-coating Spiro-OMeTAD, and depositing Au electrodes.
5：Data Analysis Methods:
The performance of PSCs is evaluated based on J-V characteristics, and the morphology and crystallinity of perovskite films are analyzed using FESEM and XRD, respectively.
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TiO2 paste
Used as a compact and mesoporous layer in the solar cell fabrication.
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PbI2
Aldrich
Used as a precursor in the perovskite film preparation.
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H4abtc
Jinan Henghua Sci. & Tec. Co., Ltd.
Used as an additive to improve the performance and stability of perovskite solar cells.
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Spiro-MeOTAD
Aldrich
Used as a hole transporting material in the solar cell fabrication.
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Li-TFSI
Aldrich
Used as an additive in the hole transporting material.
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4-tert-butyl-pyridine
Aldrich
Used as an additive in the hole transporting material.
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Chlorobenzene
Aldrich
Used as a solvent in the preparation of the hole transporting material.
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FTO coated glass
NSG, Japan
Used as the substrate for the solar cell fabrication.
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Au film
Used as the electrode in the solar cell fabrication.
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