研究目的
Investigating a simple, scalable and versatile fabrication process of CH3NH3PbBr3 layer through electrodeposition technique for photodetector application.
研究成果
MAPbBr3 layers with two different thickness were fabricated by electrochemical deposition method followed by a vapor conversion step. The photodetector device based on 300 s electrodeposited MAPbBr3 film showed significant performance with the light/dark current ratio of 3 × 106 at 0.1 V bias voltage and 34.4% improvement of EQE compared to 200 s electrodeposited film.
研究不足
The challenge of integrating perovskite single crystals in electronic systems due to the difficulty of coating on amorphous/polycrystalline substrates.
1：Experimental Design and Method Selection:
The synthesis of MAPbBr3 films was performed in two steps; electrodeposition of PbO2 using galvanostatic condition on FTO coated glasses, followed by the conversion of PbO2 films into perovskite with the MABr powder in a solid–solid transformation process.
2：Sample Selection and Data Sources:
FTO-coated glass was used as the substrate.
3：List of Experimental Equipment and Materials:
A three-electrode electrochemical cell containing the FTO as the working electrode, platinum as the counter electrode, and an Ag/AgCl electrode as the reference electrode. The chemical composition of electrodepositing bath was
4：1 M Pb(CH3COO)2, 0 M Na(CH3COO) and 40 mM NaF. Experimental Procedures and Operational Workflow:
Electrodeposition was done at room temperature without stirring. The current density was kept fixed at
5：27 mA cm?The conversion of PbO2 films into perovskite was carried out in a 7 bar vacuum system and heating at 170°C for 2 h. Data Analysis Methods:
The composition and crystal structure of the as-prepared films was characterized by X-ray powder diffraction (XRD). UV–Vis Array spectrophotometer was used to measure the optical absorption of the layers. The surface morphology and the composition of the films were probed by a field emission scanning electron microscopy (FESEM). The current–voltage (I–V) characteristic was obtained using a Keithley K361 sourcemeter. External quantum efficiency (EQE) spectra was measured by QEX10 Solar Cell Quantum Efficiency Measurement.
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