研究目的
Investigating the effect of iodine-induced PbI2 porous morphology manipulation on the performance of planar perovskite solar cells.
研究成果
The introduction of iodine into PbI2 precursor successfully manipulates the morphology of PbI2 films, leading to high-quality perovskite films with improved photovoltaic performance. The optimal iodine content results in a perovskite solar cell with a PCE of 18.63%, demonstrating the effectiveness of this novel strategy in enhancing device performance.
研究不足
The study focuses on the manipulation of PbI2 morphology using iodine and its effect on perovskite film quality and solar cell performance. Potential limitations include the scalability of the method and the long-term stability of the devices under operational conditions.
1：Experimental Design and Method Selection
The study involves replacing conventional PbI2 with a PbI2/I2 mixed precursor during the first step of sequential deposition to manipulate the morphology of the PbI2 film and the resulting perovskite film.
2：Sample Selection and Data Sources
Perovskite films were prepared on compact TiO2/Fluorine-doped SnO2 (FTO) substrates using PbI2:xI2 precursors with varying iodine content.
3：List of Experimental Equipment and Materials
Field-emission scanning electron microscope (Hitachi, SU8010),X-ray diffractometer (D/MAX-III-B-40KV),Spectrofluorometer (Horiba, Fluoromax-4),Fluorescence spectrometer (Edinburgh Instruments FS5),Newport solar simulator,Keithley 2400 Sourcemeter,Newport QE 200 system,UV–vis spectrophotometer (Shimadzu, UV-3600),Electrochemical workstation (Autolab, PGSTAT 302N),Atomic force microscope (Bruker, Dimension Icon)
4：Experimental Procedures and Operational Workflow
The fabrication process involved spin-coating PbI2:xI2 precursor solutions on TiO2/FTO substrates, annealing to remove excess solvent and iodine, spin-coating MAI/isopropanol solution, and heating to form perovskite films. The films were then characterized for morphology, phase, and photovoltaic performance.
5：Data Analysis Methods
Data analysis included SEM imaging, XRD pattern analysis, PL and TRPL spectroscopy, J-V measurement, EQE testing, UV-Vis absorption spectroscopy, EIS measurement, and AFM surface morphology analysis.
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Field-emission scanning electron microscope
SU8010
Hitachi
Characterization of the morphology of the samples.
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Fluorescence spectrometer
FS5
Edinburgh Instruments
Measurement of TRPL spectra of perovskite.
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Sourcemeter
2400
Keithley
Measurement of current density versus voltage (J–V) curves.
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UV–vis spectrophotometer
UV-3600
Shimadzu
Collection of absorption spectra.
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Electrochemical workstation
PGSTAT 302N
Autolab
Measurement of EIS under illumination.
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Atomic force microscope
Dimension Icon
Bruker
Measurement of perovskite film surface morphology.
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X-ray diffractometer
D/MAX-III-B-40KV
Not specified
Measurement of the phase of samples.
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Spectrofluorometer
Fluoromax-4
Horiba
Recording of the PL spectrum.
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Solar simulator
Not specified
Newport
Measurement of current density versus voltage (J–V) curves under AM1.5G irradiation.
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QE system
QE 200
Newport
Testing of EQE curves.
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