研究目的
Investigating the green and simple preparation of carbon-coated iron pyrite thin films for solar cells application.
研究成果
The FeS2@C thin film can be a good counter electrode for the performance of dye-sensitized solar cells, achieving a power conversion efficiency of ~6.94%.
研究不足
The relatively low conductivity of FeS2 compared to Pt still a problem, which restricts the further improvement of the efficiency of DSSCs.
1：Experimental Design and Method Selection
The FeS2@C thin film was prepared by a green and simple method involving the coating of synthesized iron pyrite nanoparticles with a carbon layer and depositing them on a fluorine-doped tin oxide (FTO) substrate by spin-coating.
2：Sample Selection and Data Sources
Iron (II) chloride tetrahydrate, d-(+)-glucose, octadecylamine, sulfur, oleylamine, trioctylamine, perchloric acid, and sodium dodecyl sulfate were used as received. The FeS2@C thin film was characterized by various techniques.
3：List of Experimental Equipment and Materials
Powder X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, transmission electron microscopy (TEM), high-resolution TEM (HR-TEM), solar simulator, IPCE G1218a, electrochemical impedance spectroscopy (EIS), and Tafel polarization curves were used.
4：Experimental Procedures and Operational Workflow
The FeS2@C thin film was prepared by coating synthesized iron pyrite nanoparticles with a carbon layer and depositing them on an FTO substrate by spin-coating. The devices were fabricated and their performance was measured.
5：Data Analysis Methods
The performance of the devices was analyzed using solar simulator, IPCE, EIS, and Tafel polarization curves.
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Powder X-ray diffraction
Measurement of the crystal structure of the as-synthesized sample
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Raman spectroscopy
WiTec confocal Raman machine
Performed using a WiTec confocal Raman machine (Ar+ laser, λ = 532 nm) with the range of 200–2000 cm?1 at room temperature
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X-ray photoelectron spectroscopy
Conducted using Al Kα monochromatic radiation as the excitation source
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Transmission electron microscopy
CM-200
Philips
Characterization of the sample’s morphology
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High-resolution TEM
Characterization of the sample’s morphology
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Solar simulator
Keithley model 2400 Source Meter
Measurement of the device efficiency under the illumination of 100 mW cm?2 (AM 1.5)
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IPCE
G1218a
Measurement of the incident photon-to-current conversion efficiency (IPCE) or the external quantum efficiency (EQE)
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Electrochemical impedance spectroscopy
Iviumstat Tec.
Performed in the dark with the same electrolyte and using an electronic-chemical analyzer
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Tafel polarization curves
Iviumstat Tec.
Performed in the dark with the same electrolyte and using an electronic-chemical analyzer
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