Ag Nanowire-Plasmonic-Assisted Charge Separation in Hybrid Heterojunctions of Ppy-PEDOT:PSS/GaN Nanorods for Enhanced UV Photodetection
- 17 November 2020
- journal article
- research article
- Published by American Chemical Society (ACS) in ACS Applied Materials & Interfaces
- Vol. 12 (48), 54181-54190
- https://doi.org/10.1021/acsami.0c16795
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 photoelectron spectroscopy to explore the origin of the superior performance of the Ag NWs-decorated Ppy-PEDOT:PSS/GaN NRs photodetector. The proposed hybrid structure seems to be a promising candidate for the development of high-performance UV photodetectors.Keywords
Funding Information
- National Research Foundation of Korea (2017R1E1A1A01073076, 2020R1A03047771, 2020R1A2C2013385)
- Ministry of Trade, Industry and Energy (P0008458)
This publication has 62 references indexed in Scilit:
- Ultrasensitive photodetectors based on monolayer MoS2Nature Nanotechnology, 2013
- Photophysics of polymeric carbon nitride: An optical quasimonomerPhysical Review B, 2013
- A facile approach for the fabrication of core–shell PEDOT nanofiber mats with superior mechanical properties and biocompatibilityJournal of Materials Chemistry B, 2013
- Highly Conductive and Transparent PEDOT:PSS Films with a Fluorosurfactant for Stretchable and Flexible Transparent ElectrodesAdvanced Functional Materials, 2011
- Fabrication of ZnO/α-NPD:F4-TCNQ based inorganic–organic hybrid junction: Effect of doping of organic layer on the diode like characteristicsThin Solid Films, 2010
- Significant Conductivity Enhancement of Conductive Poly(3,4-ethylenedioxythiophene): Poly(styrenesulfonate) Films through a Treatment with Organic Carboxylic Acids and Inorganic AcidsACS Applied Materials & Interfaces, 2010
- Photovoltage effects in polypyrrole–diamond nanosystemDiamond and Related Materials, 2009
- X-ray Photoelectron Spectroscopy Study of Counterion Incorporation in Poly(3,4-ethylenedioxythiophene)The Journal of Physical Chemistry C, 2009
- III nitrides and UV detectionJournal of Physics: Condensed Matter, 2001
- Precise Determination of the Valence-Band Edge in X-Ray Photoemission Spectra: Application to Measurement of Semiconductor Interface PotentialsPhysical Review Letters, 1980