研究目的
Investigating the preparation of crystallized graphite nano?bers by nozzle-less electrospinning and subsequent low-temperature heat treatment for application in perovskite solar cells to improve device performance.
研究成果
The study successfully demonstrated a simple and low-temperature method to fabricate high-quality graphite nano?bers, which were effectively applied as a scaffold in perovskite solar cells to improve electron transfer property and device performance, achieving a high power conversion efficiency of 18.23%.
研究不足
The study focuses on the preparation and application of graphite nano?bers in perovskite solar cells, with limitations including the need for specialized equipment for electrospinning and thermal treatment, and the potential for further optimization of the graphitization process.
1：Experimental Design and Method Selection:
The study utilized nozzle-less electrospinning and subsequent low-temperature heat treatment (500 °C) to prepare crystallized graphite nano?bers.
2：Sample Selection and Data Sources:
Graphite powder was dissolved in DMF and dispersed by ultrasonic cell disruption to obtain graphite nanosheets. Polyvinylpyrrolidone (PVP) and polyacrylonitrile (PAN) were dissolved in DMF as carriers.
3：List of Experimental Equipment and Materials:
Electrospinning apparatus, high positive voltage source, aluminum foil collector, Ar atmosphere furnace, UV-ozone treatment system, spin-coater, solar simulator.
4：Experimental Procedures and Operational Workflow:
Electrospinning was carried out with a high positive voltage over a collector distance. The obtained nano?bers were stabilized in air and then carbonized under Ar atmosphere.
5：Data Analysis Methods:
Morphology examined by AFM, SEM, and TEM; crystal structure by Raman spectra and XRD; photovoltaic characterization by Keithley 2400 digital source meter under AM1.5G illumination.
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Transmission electron microscope
Hitachi HT7700
Hitachi
Examined the morphology of nano?bers with 200 kV acceleration voltage.
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X-ray diffraction
Bruker D8
Bruker
Measured the crystal structure of nano?bers with Cu-Kα radiation.
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Fluorescence spectrophotometer
Edinburgh FSL980
Edinburgh
Characterized time-resolved photoluminescence.
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Digital source meter
Keithley 2400
Keithley
Carried out photovoltaic characterization under illumination of AM1.5G.
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Scanning electron microscope
Hitachi S4800
Hitachi
Examined the morphology of nano?bers.
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Electrospinning apparatus
Used for the preparation of graphite nano?bers through nozzle-less electrospinning.
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Atomic force microscopy
NT-MDT Spectra
NT-MDT
Examined the morphology of nano?bers.
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Raman spectra
Renishaw invia
Renishaw
Measured the crystal structure of nano?bers.
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Thermogravimetric differential scanning calorimetry
Netzsch STA 449F3
Netzsch
Performed stability tests under a N2 thermobalance.
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