研究目的
Investigating the effects of high-humidity treatment on the efficiency and performance of inverted perovskite solar cells.
研究成果
The high-humidity treatment induces lattice distortion on the surface of perovskite grains, leading to self-passivation and significant improvement in the VOC and PCE of inverted PSCs. This strategy provides a new approach to enhancing the performance of PSCs by controlling the preparation environment.
研究不足
The study focuses on the effects of high-humidity treatment on CH3NH3PbI3 perovskite films and may not be directly applicable to other perovskite compositions. The stability of the devices under long-term operational conditions was not extensively studied.
1：Experimental Design and Method Selection:
The study involved the preparation of perovskite solar cells with a high-humidity treatment during the anti-solvent washing step and sufficient DMSO-atmosphere annealing.
2：Sample Selection and Data Sources:
Two types of PSCs were fabricated: control devices with CH3NH3PbI3 film fabricated in a nitrogen glove-box with very low humidity and self-passivation devices with CH3NH3PbI3 film fabricated in nitrogen glove box with high-humidity.
3：List of Experimental Equipment and Materials:
Materials included Methylammonium iodide, lead iodide, PTAA, PC61BM, Bphen, F4-TCNQ, DMF, DMSO, chlorobenzene, ethyl acetate, 2-butanol, and PMMA. Equipment included SEM, AFM, XRD, XPS, UV–vis absorption spectrometer, laser confocal fluorescence microscopy, steady-state PL, and TRPL decay measurements.
4：Experimental Procedures and Operational Workflow:
The perovskite solution was spun onto the ITO/PTAA: F4-TCNQ/PMMA surface, followed by annealing in ambient atmosphere and DMSO atmosphere.
5：Data Analysis Methods:
The performance of PSCs was evaluated through J–V curves, EQE spectra, and statistical analysis of photovoltaic parameters.
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Dimethylsulfoxide
DMSO
Sigma-Aldrich
Used as a solvent in the preparation of perovskite solution and for annealing.
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Polymethyl methacrylate
PMMA
Sigma-Aldrich
Acts as the interfacial passivation layer between the hole transport layer and perovskite.
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N,N-dimethylformamide
DMF
Sigma-Aldrich
Used as a solvent in the preparation of perovskite solution.
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Methylammonium iodide
CH3NH3I
TCI
Used as a precursor in the preparation of perovskite solar cells.
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Lead iodide
PbI2
TCI
Used as a precursor in the preparation of perovskite solar cells.
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Poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine]
PTAA
vizhuchem
Used as the hole transport layer in perovskite solar cells.
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[6,6]-phenyl-C61-butyric acid methyl ester
PC61BM
Nano-C
Used as the electron transporting layer in perovskite solar cells.
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4,7-diphenyl-1,10-phenanthroline
Bphen
Nichem Fine Technology Co., Ltd.
Used to modify the electron transporting layer in perovskite solar cells.
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2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane
F4-TCNQ
Nichem Fine Technology Co., Ltd.
Used as a dopant in the hole transport layer.
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