研究目的
Investigating the use of CuSCN as an inorganic hole transport material with 3D/2D perovskite solar cells to improve stability and efficiency.
研究成果
The combinatory approach of using 2D perovskites as passivation layers and CuSCN as an inorganic HTM significantly improves the stability of perovskite solar cells while maintaining high power conversion efficiencies. Theoretical calculations support the potential of this architecture for achieving high efficiencies, with practical devices showing efficiencies over 18%.
研究不足
The study does not address the long-term stability under operational conditions beyond 400 hours. The impact of interfacial defects between 3D and 2D perovskites on device performance is noted as a limitation.
1：Experimental Design and Method Selection
The study involves the fabrication of perovskite solar cells with 3D/2D perovskite absorber layers and CuSCN as an inorganic hole transport material. The 2D perovskites were deposited by spin coating PEAI and FPEAI dissolved in isopropanol on top of the perovskite capping layer.
2：Sample Selection and Data Sources
The samples include conductive FTO glass cleaned and prepared with a compact TiO2 layer, mesoporous TiO2 film, and triple cation perovskite with a composition of (FAPbI3)0.77(MAPbBr3)0.14(CsPbI3)0.09 used as absorber material.
3：List of Experimental Equipment and Materials
Materials used include Formamidinium iodide (FAI), methylammonium bromide (MABr), lead iodide (PbI2), lead bromide (PbBr2), cesium iodide (CsI), phenylethylammonium iodide (PEAI), and 4-fluoroPhenylethylammonium iodide (F-PEAI), TiO2 paste, copper thiocyanate (CuSCN), diethyl sulfide.
4：Experimental Procedures and Operational Workflow
The perovskite layers were fabricated by a single step spin-coating procedure based on the anti-solvent addition. The substrates were annealed at 100 °C for 1h. For forming an additional 2D perovskite film, cooled substrates were treated with a PEAI or FPEAI isopropanol solution.
5：Data Analysis Methods
Characterizations included SEM imaging, thickness measurement using a stylus profilometer, X-ray diffraction, photovoltaic device performance analysis using a solar simulator, current-voltage curves measurement, absorption spectra measurement, and photoluminescence (PL) measurement.
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Formamidinium iodide
FAI
Greatcell
Used as a precursor in the preparation of perovskite solar cells.
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Methylammonium bromide
MABr
Greatcell
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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Lead bromide
PbBr2
TCI
Used as a precursor in the preparation of perovskite solar cells.
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Cesium iodide
CsI
ABCR
Used as a precursor in the preparation of perovskite solar cells.
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Phenylethylammonium iodide
PEAI
Greatcell Solar
Used to create thin layers of 2D perovskite on top of the 3D perovskite.
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4-fluoroPhenylethylammonium iodide
F-PEAI
Greatcell Solar
Used to create thin layers of 2D perovskite on top of the 3D perovskite.
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TiO2 paste
30 N-RD
Greatcell Solar
Used in the fabrication of the mesoporous TiO2 film.
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Copper thiocyanate
CuSCN
Sigma Aldrich
Used as an inorganic hole transport material in perovskite solar cells.
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Diethyl sulfide
Sigma Aldrich
Used as a solvent for CuSCN in the preparation of the hole transport layer.
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