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Vertically aligned GaN nanorod arrays/p-Si heterojunction self-powered UV photodetector with ultrahigh photoresponsivity

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Abstract

Self-powered photodetectors have demonstrated potential for developing future wireless and implantable devices. Herein, we present a self-powered UV photodetector with an ultrahigh photoresponse based on vertically oriented and high crystalline quality ${n}$-type GaN nanorod arrays: poly(methyl methacrylate)/p-Si heterojunction. Benefiting from the highly efficient separation and transport of photoexcited electron–hole pairs, significant improvements in photoresponsivity are experimentally obtained. In a zero-biased self-powered detection mode, a ${6.7}\;{\rm A}\;{{\rm W}^{- 1}}$ responsivity and ${2.68} \times {{10}^{13}}$ Jones detectivity are achieved under 355 nm light illumination, and the response time is as low as 0.29/3.07 ms (rise/fall times).

© 2020 Optical Society of America

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Supplementary Material (1)

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Supplement 1       Fig. S1; Fig. S2; Fig. S3; Table S1.

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