研究目的
To demonstrate a simple and efficient process to improve the device performance of perovskite solar cells (PeSCs) by using a textured SnO2 film.
研究成果
The study successfully demonstrated that a textured SnO2 ETL, achieved through a simple one-step solution process with aged sol-gel SnO2, significantly improves the performance of PeSCs. The optimal device achieved a PCE of 19%, attributed to enhanced light trapping, rapid charge extraction, and reduced interfacial recombination. This approach offers a promising pathway for developing high-efficiency PeSCs with simplified fabrication processes.
研究不足
The study is limited by the need for precise control over the aged time of the sol-gel SnO2 solution to achieve optimal textured structure. Additionally, the scalability of the process and long-term stability of the devices under operational conditions were not extensively explored.
1：Experimental Design and Method Selection:
The study employed a self-aged sol-gel SnO2 solution to create a textured structure for electron transport layers (ETLs) in PeSCs. The method involved optimizing the aged time of the sol-gel SnO2 solution to mimic the evolution of conventional mesoporous layers.
2：Sample Selection and Data Sources:
FTO glass substrates were used, treated by UV-ozone before spin coating. The SnO2 ETLs were prepared by spin-coating SnCl2·2H2O precursor at different aged times (0, 2, 4, 6, and 8 days).
3：List of Experimental Equipment and Materials:
Equipment included a spin coater, UV-ozone cleaner, SEM, AFM, DLS analyzer, UV-vis spectrophotometer, XRD, and a solar simulator for J-V measurements. Materials included SnCl2·2H2O, FTO glass, perovskite precursors (PbI2, CH3NH3I), and spiro-MeOTAD.
4：Experimental Procedures and Operational Workflow:
The SnO2 ETLs were deposited via spin coating, followed by thermal annealing. Perovskite layers were then deposited via a two-step process, followed by the application of a hole transport layer and Ag electrode.
5：Data Analysis Methods:
The performance of PeSCs was analyzed through J-V curves, UV-vis absorption, PL spectra, and EIS to understand charge transfer and recombination dynamics.
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SEM
SU-70
Hitachi
Morphology characterization
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DLS analyzer
Zetasizer Nano ZS
Malvern
Particle size analysis
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FTO glass
Substrate for the perovskite solar cells
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SnCl2·2H2O
Precursor for SnO2 electron transport layer
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spiro-MeOTAD
Hole transport material
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UV-ozone cleaner
Surface treatment of substrates
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AFM
Cypher
Asylum Research
Surface morphology analysis
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UV-vis spectrophotometer
Cary 5000
Varian
Optical properties measurement
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XRD
Bruker
Crystallinity analysis
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Solar simulator
81904
Newport
J-V characterization
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