Solar-blind deep-ultraviolet (DUV) photoconductive detectors based on an $\mathrm{La}\mathrm{Al}{\mathrm{O}}_3$ (LAO) single crystal with interdigitated electrodes are reported. The LAO detectors show a high sensitivity to DUV light with wavelengths less than $210\mathrm{nm}$ , and the DUV/UV (200 versus $290\mathrm{nm}$ ) contrast ratio is more than 2 orders of magnitude. The photocurrent responsivity of LAO detector reaches $71.8\mathrm{mA}∕\mathrm{W}$ at $200\mathrm{nm}$ at $10\mathrm{V}$ bias, and the corresponding quantum efficiency η is 44.6%. The noise current under sunlight at midday outdoors is only $77\mathrm{pA}$ . The experimental results indicate that the LAO detectors have attractive potential applications in DUV detection.

© 2009 Optical Society of America

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