Photocurrent Polarity Switching and Enhanced Photoresponse in Silver Nanoparticles Decorated a-GaN-Based Photodetector

Singh, DK and Prajapat, P and Saroha, J and Pant, RK and Sharma, SN and Nanda, KK and Krupanidhi, SB and Gupta, G (2023) Photocurrent Polarity Switching and Enhanced Photoresponse in Silver Nanoparticles Decorated a-GaN-Based Photodetector. In: ACS Applied Electronic Materials .

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Abstract

The photodetection properties of a-GaN nanorods-based photodetector and the effect of decorating silver nanoparticles are reported. For the pristine a-GaN detector, a surprising phenomenon of negative photoconductivity is observed, explained on the basis of defect states present in GaN nanorods. After the introduction of nanoparticles, the device exhibits reversal in the photocurrent polarity. The photoresponsivity reverses its sign from −0.12 A/W (bare a-GaN) to +6.75 A/W, with the introduction of nanoparticles (wavelength: 355 nm, 4.9 V bias). This current reversal and enhanced performance have been rationalized by considering passivation of surface defect states, resulting into significantly reduced dark current in the hybrid detector.

Item Type:	Journal Article
Publication:	ACS Applied Electronic Materials
Publisher:	American Chemical Society
Additional Information:	The copyright for this article belongs to American Chemical Society.
Keywords:	Defect states; Gallium nitride; III-V semiconductors; Metal nanoparticles; Nanorods; Passivation; Photodetectors; Photons; Surface defects, A-GaN nanorod; Defect passivation; Defect state; GaN based; GaN detectors; GaN nanorods; Photo detection; Photoresponses; Polarity switching; Property, Silver nanoparticles
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	15 Mar 2023 09:17
Last Modified:	15 Mar 2023 09:17
URI:	https://eprints.iisc.ac.in/id/eprint/80998

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