研究目的
To develop a facile surface passivation method for efficient inorganic CsPbI2Br perovskite solar cells with efficiencies over 15%.
研究成果
The use of KF as a surface modifier for CsPbI2Br perovskite significantly passivates defects at grain boundaries, leading to enhanced PVSC performance with a PCE of 15.01% and improved stability. This simple, low-cost passivation strategy is promising for high-performance and stable all-inorganic PVSCs.
研究不足
The study focuses on the passivation of CsPbI2Br perovskite films using KF, but the long-term stability under operational conditions and the scalability of the method for large-area devices are not extensively explored.
1：Experimental Design and Method Selection:
The study employed a simple solution process for surface passivation of CsPbI2Br perovskite films using KF. The methodology included spin-coating a KF solution on the perovskite surface to passivate defects at grain boundaries.
2：Sample Selection and Data Sources:
CsPbI2Br perovskite films were prepared via a one-step spin-coating method. The films were annealed and then treated with KF isopropanol solution.
3：List of Experimental Equipment and Materials:
Materials included SnO2 colloid precursor, dimethyl sulfoxide (DMSO), chlorobenzene, acetonitrile, isopropanol, PbBr2, PbI2, KF, CsI, and Spiro-OMeTAD. Equipment included a Keithley 2400 source measurement unit, Oriel Sol3A simulator, and various spectrometers for characterization.
4：Experimental Procedures and Operational Workflow:
The CsPbI2Br films were deposited via spin-coating, annealed, and then treated with KF solution. The films were characterized using XPS, XRD, SEM, AFM, PL, and TRPL measurements.
5：Data Analysis Methods:
The performance of PVSCs was evaluated through J-V curves, EQE measurements, and impedance spectroscopy. Trap densities were estimated using the SCLC method.
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SnO2 colloid precursor
Tin(IV) oxide, 15% in H2O colloidal dispersion
Alfa Aesar
Used as a precursor for the electron transport layer in perovskite solar cells.
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Dimethyl sulfoxide
DMSO, anhydrous, 99.8%
Acros
Used as a solvent for preparing the perovskite precursor solution.
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Chlorobenzene
anhydrous, 99%
Acros
Used as a solvent for preparing the Spiro-OMeTAD solution.
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Acetonitrile
anhydrous, 99.8%
Acros
Used as a solvent for preparing the FK 209 solution.
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Isopropanol
anhydrous, 99.8%
Acros
Used as a solvent for the KF solution and for cleaning substrates.
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PbBr2
99%
Tokyo Chemical Industry (TCI)
Used as a precursor for the perovskite layer.
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PbI2
99%
Tokyo Chemical Industry (TCI)
Used as a precursor for the perovskite layer.
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KF
99.999%
Aladdin
Used as a surface passivation agent for the perovskite layer.
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CsI
99.9%
Xi’an Polymer Light Technology Corp
Used as a precursor for the perovskite layer.
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Spiro-OMeTAD
Shenzhen Feiming Science and Technology Co., Ltd
Used as the hole transport layer in perovskite solar cells.
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