研究目的
Enhancing the performance and stability of perovskite solar cells (PSC) by lowering defect traps through the incorporation of NH4+ and SCN- binary ions as additive to control the crystal growth.
研究成果
The incorporation of NH4+ and SCN- binary ions as additives significantly improved the performance and stability of perovskite solar cells fabricated in ambient air. The optimal concentration of NH4SCN additive (15 mol%) led to a 20% improvement in PCE and maintained ~90% of the initial efficiency after 400 h in ambient air. The study provides insights into the defect properties and carrier recombination dynamics, offering a simple approach to enhance the commercial prospects of PSCs.
研究不足
The study was conducted under ambient air conditions with relative humidity ranging from 30% to 50%, which may affect the reproducibility and stability of the devices. The optimal concentration of NH4SCN additive was found to be 15 mol%, beyond which device performance deteriorated.
1：Experimental Design and Method Selection:
The study employed a one-step solution method for fabricating perovskite films with NH4+ and SCN- binary ions as additives to control crystal growth and reduce defect density.
2：Sample Selection and Data Sources:
Perovskite precursor solutions were prepared with varying concentrations of NH4SCN additive.
3：List of Experimental Equipment and Materials:
Instruments included a spin-coater for film deposition, a solar simulator for J-V measurements, and various characterization tools like SEM, XRD, UV-vis spectroscopy, and XPS.
4：Experimental Procedures and Operational Workflow:
Perovskite films were spin-coated onto c-TiO2 layers, followed by annealing and the deposition of a hole transport layer and Ag electrodes.
5：Data Analysis Methods:
Performance parameters were extracted from J-V curves, and defect densities were calculated from SCLC measurements.
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FTO substrate
Used as the substrate for the perovskite solar cells.
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c-TiO2 layer
Serves as the electron transport layer in the perovskite solar cells.
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spiro-OMeTAD
Used as the hole transport material in the perovskite solar cells.
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Ag
Deposited as the electrode material on the hole transport layer.
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NH4SCN
Aldrich
Used as an additive in the perovskite precursor to control crystal growth and reduce defect density.
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CH3NH3I
One of the precursors for the perovskite material.
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PbI2
Xi’an Polymer
One of the precursors for the perovskite material.
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DMF
Aldrich
Used as a solvent in the preparation of the perovskite precursor solution.
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DMSO
Used as a solvent in the preparation of the perovskite precursor solution.
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ethyl acetate
Used during the spin-coating process for the perovskite film.
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Li-TFSI
Used as an additive in the spiro-OMeTAD solution.
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4-tert-butylpyridine
Used as an additive in the spiro-OMeTAD solution.
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chlorobenzene
Used as a solvent for the spiro-OMeTAD solution.
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acetonitrile
Used as a solvent for the Li-TFSI solution.
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