研究目的
Investigating the role of lattice mismatch in the thermal degradation process of cesium-containing perovskite films on Al doped ZnO (AZO) and employing a Ba(OH)2 buffer layer to release the lattice mismatch and suppress the thermal degradation.
研究成果
The Ba(OH)2 modification effectively releases lattice mismatch-induced stress, suppresses thermal degradation, and improves the crystal quality and thermal stability of CsFA films, leading to enhanced performance of ETL-free perovskite solar cells.
研究不足
The study focuses on the thermal stability of perovskite films on AZO substrates with Ba(OH)2 modification but does not extensively explore other potential buffer layers or the long-term stability under operational conditions.
1：Experimental Design and Method Selection:
The study involved the fabrication of perovskite solar cells with and without Ba(OH)2 modification to investigate the effects on thermal stability and performance.
2：Sample Selection and Data Sources:
CsFA perovskite films were deposited on AZO substrates with varying concentrations of Ba(OH)
3：List of Experimental Equipment and Materials:
Materials included PbI2, PbBr2, MABr, FAI, CsI, and Ba(OH)
4：Equipment included a Keithley 2400 source meter, Newport Oriel Solar 3A solar simulator, and various spectrometers for characterization. Experimental Procedures and Operational Workflow:
Perovskite films were spin-coated on AZO surfaces, annealed, and characterized using XRD, SEM, UV-Vis, FTIR, and PL measurements.
5：Data Analysis Methods:
Data were analyzed using Halder-Wagner method for stress and crystallite size distribution, and performance parameters were extracted from J-V and EQE measurements.
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Keithley 2400 source meter
2400
Keithley
Recording current-voltage data under AM 1.5G illumination.
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FEI-Inspect F50 field emission scanning electron microscope
Inspect F50
FEI
Obtaining morphology and element mapping of perovskite films.
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Schimadzu UV-3101 PC UV–Vis spectrophotometer
UV-3101 PC
Schimadzu
Recording UV–Vis absorption spectra.
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Kratos XSAM800 X-ray Photoelectron Spectrometer
XSAM800
Kratos
Analyzing the distribution of surface groups.
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Newport Oriel Solar 3A solar simulator
Oriel Solar 3A
Newport
Providing AM 1.5G illumination for solar cell testing.
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Nicolet 6700 spectrophotometer
6700
Nicolet
Recording FTIR spectra.
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F-4600 FL fluorescence spectrophotometer
F-4600
Measuring photoluminescence (PL).
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ThermoFisher Ultraviolet Photoelectron Spectrometer
ThermoFisher
Determining the energy band position of CsFA.
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Seiko SP13800 N atomic force microscope
SP13800 N
Seiko
Measuring surface roughness.
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