研究目的
Tuning the composition of organic-inorganic perovskite materials by methylammonium iodide (MAI) post-treatment for high photovoltaic performance.
研究成果
The removal of PbI2 from the perovskite layers decreased the hysteresis in J-V curves. Adding excess MAI to the perovskite layer improved the PCE values of the solar cells, owing to recombination suppression. The post-treatment technique, which does not affect the morphology of the perovskite layers, would be a powerful tool in improving the efficiency of perovskite solar cells.
研究不足
The study does not address the long-term stability of the perovskite solar cells post MAI treatment. The effect of MAI treatment on the scalability of the fabrication process is not discussed.
1：Experimental Design and Method Selection:
The study involved the formation of Cs
2：05(FA83MA17)95Pb(I83Br17)3 perovskite layers from a precursor containing 10% excess PbI2 on a TiO2 electron collector. MAI post-treatment was performed by spin-coating MAI solutions of varying concentrations on the perovskite layers. Sample Selection and Data Sources:
Perovskite layers were fabricated on TiO2/FTO substrates.
3：List of Experimental Equipment and Materials:
F-doped tin oxide (FTO) substrates, compact TiO2 layers, mesoporous TiO2 layers, Cs
4：05(FA83MA17)95Pb(I83Br17)3 perovskite layers, MAI solutions, 2-propanol, chlorobenzene, spiro-OMeTAD, Au. Experimental Procedures and Operational Workflow:
Perovskite layers were formed on TiO2 layers by spin-coating a precursor solution, followed by annealing. MAI solutions were spin-coated on the substrates, followed by annealing. Solar cells were fabricated by spin-coating spiro-OMeTAD solutions on perovskite layers followed by Au vapor deposition.
5：Data Analysis Methods:
X-ray diffraction analysis (XRD), scanning electron microscopy (SEM), absorption spectra, photoelectron yield spectroscopy (PYS), photovoltaic performance characterization.
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F-doped tin oxide (FTO) substrates
Substrate for the solar cells
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compact TiO2 layers
Electron collector layer
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mesoporous TiO2 layers
18 NR-T
GreatCell Solar
Electron collector layer
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Cs0.05(FA0.83MA0.17)0.95Pb(I0.83Br0.17)3 perovskite layers
Light-harvesting material
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MAI solutions
Post-treatment agent
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2-propanol
Solvent for MAI solutions
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chlorobenzene
Inducing perovskite crystallization
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spiro-OMeTAD
Hole transport material
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Au
Electrode material
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