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XRD patterns of the films with Mg compositions of 0.50, 0.52, 0.55, 0.62, and 0.70, respectively.
Transmission spectra of thin films (, 0.52, 0.55, 0.62, and 0.70). The inset is a plot of vs that gives the band gaps of these films.
Schematic of MSM structured photodetector. The Au fingers are long and wide, and the interelectrode spacing is .
(a) Response spectrum of solar-blind photodetector under 10 V bias, the inset shows the responsivity as function of bias voltage under 250 nm light illumination. (b) Dark current of the photodetector as a function of bias voltage.
Normalized response spectra of photodetectors with , 0.52, 0.55, 0.62, and 0.70. The inset shows the cutoff wavelength of the photodetectors as a function of Mg content.
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