Interplay of the photovoltaic and photoconductive operation modes in visible-blind photodetectors based on axial p-i-n junction GaN nanowires

We report on the mixed photovoltaic/photoconductive operation mode of a visible blind photodetector based on GaN nanowires containing a p-i-n junction. The photodetector operates as a photovoltaic device close to zero bias and exhibits a photoconductive gain (>100) for biases above vertical bar V vertical bar > 2 V. We show that this unusual behavior of a p-i-n photodiode is specific to the case of nanowires. The gain is attributed to the illumination-induced modulation of the width of the depleted region at the nanowire lateral surface allowed because of the specific nanowire geometry with the p-i-n junction orthogonal to the lateral nanowire surface. (C) 2014 AIP Publishing LLC.


Published in:
Applied Physics Letters, 104, 2
Year:
2014
Publisher:
Melville, Amer Inst Physics
ISSN:
0003-6951
Laboratories:




 Record created 2014-04-02, last modified 2018-09-13


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