Polymer Nanocomposite Graphene Quantum Dots for High-Efficiency Ultraviolet Photodetector
subject: electron affinity; excitation spectra; graphene quantum dots; ionization potential; novel UV photodetector; polypyrrole
description: Influence on photocurrent sensitivity of hydrothermally synthesized electrochemically active graphene quantum dots on conjugated polymer utilized for a novel single-layer device has been performed. Fabrications of high-performance ultraviolet photodetector by depositing the polypyrrole-graphene quantum dots (PPy-GQDs) active layer of the ITO electrode were exposed to an Ultraviolet (UV) source with 265 and 355 nm wavelengths for about 200 s, and we examined the time-dependent photoresponse. The excellent performance of GQDs was exploited as a light absorber, acting as an electron donor to improve the carrier concentration. PGC4 exhibits high photoresponsivity up to the 2.33 A/W at 6 V bias and the photocurrent changes from 2.9 to 18 A. The electrochemical measurement was studied using an electrochemical workstation. The cyclic voltammetry (CV) results show that the hysteresis loop is optically tunable with a UV light source with 265 and 355 nm at 0.1 to 0.5 V/s. The photocurrent response in PPy-GQDs devices may be applicable to optoelectronics devices. 2022 by the authors.
creator: Vandana M.; Devendrappa H.; Padova P.D.; Hegde G.
source: Nanomaterials, Vol-12, No. 18
publisher: MDPI
date: 2022-01-01
rights: All Open Access; Gold Open Access; Green Open Access
relation: ISSN: 20794991
format: Online
language: English
type: Article
coverage: Vandana M., Department of Chemistry, CHRIST (Deemed to Be University), Hosur Road, Bangalore, 560029, India, Centre for Advanced Research and Development (CARD), CHRIST (Deemed to Be University), Hosur Road, Bangalore, 560029, India; Devendrappa H., Department of Physics, Mangalore University, Mangalagangothri, 574199, India; Padova P.D., Consiglio Nazionale delle Ricerche, CNR-ISM, Via Fosso del Cavaliere, Rome, 00133, Italy, INFN-Laboratori Nazionali di Frascati, Via Enrico Fermi Frascati 40, Rome, 00044, Italy; Hegde G., Department of Chemistry, CHRIST (Deemed to Be University), Hosur Road, Bangalore, 560029, India, Centre for Advanced Research and Development (CARD), CHRIST (Deemed to Be University), Hosur Road, Bangalore, 560029, India