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Narrowband ultraviolet photodetector based on MgZnO and NPB heterojunction

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Abstract

An ultraviolet photodetector was fabricated based on Mg0.07Zn0.93O heterojunction. N, N’-bis (naphthalen-1-y1)-N, N’-bis(pheny) benzidine was selected as the hole transporting layer. I-V characteristic curves of the device were measured in the dark and under the illumination of 340 nm UV light with density of 1.33mW/cm2. The device showed a low dark current of about 3×1010A and a high photo-dark current ratio of 1×105 at 2V bias. A narrowband photoresponse was observed from 300 to 400 nm and centered at 340 nm with a full width at half-maximum of only 30 nm. The maximum peak response is at 340 nm, which is 0.192A/W at the bias of 1V.

© 2012 Optical Society of America

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