研究目的
To solve the inadequate contact problem between the upper electrode and NRAs, the PEC self-powered solar-blind photodetectors with a large separation interface of photogenerated carriers were assembled by using the α-Ga2O3 or β-Ga2O3 NRAs as the active photoanode.
研究成果
The β-Ga2O3 NRAs PEC self-powered solar-blind photodetector shows a better photoelectric performance than that constructed by using the α-Ga2O3 device. Under 254 nm light illumination with the light intensity of 2.8 mW/cm2, a Rλ of 3.81 mA/W, a Ilight/Idark ratio of 28.97, and a photoresponse decay time less than 0.2 s, are obtained for the β-Ga2O3 NRAs/electrolyte solid-liquid heterojunction photodetector. These PEC self-powered solar-blind photodetectors based on Ga2O3 NRAs/electrolyte solid-liquid heterojunction with highly efficient electrons collection and low power consumption, are promising candidates for the future solar-blind photodetection.
研究不足
The study does not explicitly mention limitations, but potential areas for optimization could include improving the photoresponsivity and response time further, and exploring the stability and durability of the photodetectors under various environmental conditions.
1：Experimental Design and Method Selection:
The study involved the synthesis of α and β phases Ga2O3 vertically aligned NRAs by a combined hydrothermal and post-annealed method. A novel PEC self-powered solar-blind photodetector was then assembled by separately using the α and β phases of Ga2O3 NRAs as the active photoanodes.
2：Sample Selection and Data Sources:
The Ga2O3 NRAs grown on FTO substrate was used as the working electrode, platinum foil as counter electrode and saturated calomel electrode (SCE) as reference electrode. A 254 nm UV lamp with a power of 7 W was used as the illumination source. A
3：5 M Na2SO4 aqueous solution was used as the electrolyte. List of Experimental Equipment and Materials:
Field-emission scanning electron microscope (FESEM), transmission electron microscope (TEM), X-ray diffractometer (XRD), ultraviolet-visible (UV-Vis) absorption spectra, X-ray photoelectron spectroscopy (XPS), LabRam HR high resolution spectrometer, Nicolet 5700 FT-IR spectrometer, CHI 760E electrochemical workstation.
4：Experimental Procedures and Operational Workflow:
The electrical characterization was carried out in a three-electrode configuration. The Mott-Schottky (M-S) plots and electrochemical impedance spectroscopy (EIS) measurements were carried out at
5：0 kHz in dark. Data Analysis Methods:
The photoresponsivity (Rλ) and external quantum efficiency (EQE) were calculated based on the photocurrent measurements.
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