Ag Nanowire-Plasmonic-Assisted Charge Separation in Hybrid Heterojunctions of Ppy-PEDOT:PSS/GaN Nanorods for Enhanced UV Photodetection

ACS Applied Materials & Interfaces
Kedhareswara Sairam PasupuletiMoon-Deock Kim

Abstract

The surface states, poor carrier life, and other native defects in GaN nanorods (NRs) limit their utilization in high-speed and large-gain ultraviolet (UV) photodetection applications. Making a hybrid structure is one of the finest strategies to overcome such impediments. In this work, a polypyrrole (Ppy)-poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS)/GaN NRs hybrid structure is introduced for self-powered UV photodetection applications. This hybrid structure yields high photodetection performance, while pristine GaN NRs showed negligible photodetection properties. The ability of the photodetector is further boosted by functionalizing the hybrid structure with Ag nanowires (NWs). The Ag NWs-functionalized hybrid structure exhibited a responsivity of 3.1 × 103 (A/W), detectivity of 3.19 × 1014 Jones, and external quantum efficiency of 1.06 × 106 (%) under a UV illumination of λ = 382 nm. This high photoresponse is due to the huge photon absorption rising from the localized surface plasmonic effect of a Ag NWs network. Also, the Ag NWs significantly improved the rising and falling times, which were noted to be 0.20 and 0.21 s, respectively. The model band diagram was proposed with the assistance of X-ray phot...Continue Reading

References

Jun 12, 2013·Nature Nanotechnology·Oriol Lopez-SanchezAndras Kis
Nov 7, 2015·Advanced Materials·Christoph MerschjannStefan Lochbrunner
May 1, 2018·ACS Applied Materials & Interfaces·Rohit PantS B Krupanidhi
Feb 23, 2019·ACS Applied Materials & Interfaces·Arun Malla ChowdhuryS B Krupanidhi
Apr 7, 2013·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Lin JinQing Jiang

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