Ultraviolet photodetectors based on nanostructured SnO2 thin films/P-Si heterojunctions prepared by a hydrothermal method
Keywords:
photo sensor, detector, sensitivity, seed layer, SnO2Abstract
In this study, nanostructures of pure tin oxide were prepared on a seed layer using a hydrothermal method at different pH values (3, 9 and 11). X-ray diffraction (XRD) analysis revealed that the prepared films were polycrystalline and had tetragonal structures with crystallite sizes ranging from 5.3 to 7.3 nm when the pH increased from 3 to 9. Field emission scanning electron microscopy (FESEM) images of the prepared films indicate that the shape and size of the nanoparticles clearly change depending on the pH. The optical energy gap decreased from 3.3 to 3.1 eV as the pH increased from 3 to 9. Additionally, as the pH increases, the optical transmittance decreases. Photo-sensor results for the SnO2/Si-p substrate at a wavelength of 370 nm. At pH= 9, SnO2/P-Si had the best sensitivity (approximately 42.77%). Fast rise and fall times of less than one second were obtained for all the prepared samples.
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