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Characterizations of the film including (a) postgrowth RHEED indicating good surface order, (b) RBS spectrum of the film quantifying the composition, (c) XRD spectrum showing the highly oriented character of the film, and (d) optical transmission spectrum illustrating the UVC absorption edge.
Photocurrent generated through the device (and corresponding responsivity) by 250 nm light. Inset shows the standard contact device geometry used.
(a) The voltage-dependent photoconductor responsivity at peak-response wavelength and (b) the corresponding device dark current.
photoconductor spectral responsivity. The devices exhibit abrupt UVC response-cutoff and a DUV:VIS rejection ratio of 800:1.
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