Phenomenal improvement of external quantum efficiency, detectivity and responsivity of nitrogen doped graphene quantum dot decorated zinc oxide nanorod/polymer schottky junction UV detector

• Published in: Materials research bulletin Vol. 95; pp. 198 - 203
• Main Authors: Dhar, Saurab, Majumder, Tanmoy, Mondal, Suvra Prakash
• Format: Journal Article
• Language: English
• Published: United States Elsevier Ltd 01.11.2017
• Subjects: DOPED MATERIALS; ELECTRIC CONTACTS; External quantum efficiency (EQE); GRAPHENE; MATERIALS SCIENCE; NITROGEN; Nitrogen doped graphene quantum dots; PEDOT:PSS; PHOTODETECTORS; QUANTUM DOTS; QUANTUM EFFICIENCY; Schottky diode; SEMICONDUCTOR JUNCTIONS; ULTRAVIOLET RADIATION; UV detector; ZINC OXIDES; ZnO nanorods; ZnO nanorods; UV detector; Nitrogen doped graphene quantum dots; External quantum efficiency (EQE); PEDOT:PSS; Schottky diode
• ISSN: 0025-5408; 1873-4227
• DOI: 10.1016/j.materresbull.2017.07.038

[Display omitted] •ZnO nanorods/conducting polymer Schottky junction UV detector was fabricated.•GQDs and NGQDs were attached with nanorods to improve the detector performance.•The photodetector demonstrated high EQE, detectivity and responsivity.•NGQDs sensitized nanorod based detectors showed superior performances.•NGQD sensitized device showed high photocurrent even at lower intensity of UV light. Photodetector properties of nitrogen doped graphene quantum dot (NGQD) sensitized ZnO nanorods/poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) Schottky junction has been investigated. The photodetector demonstrated superior external quantum efficiency (EQE) (∼57681% at −1V bias) at wavelength ∼340nm, which is 4 times higher than graphene quantum dot (GQD) modified ZnO NRs based detector and 35 times higher than pristine ZnO NRs detector. NGQD modified detectors also showed higher responsivity (∼158A/W), detectivity (8.7×1012Hz1/2/W) at 340nm wavelength. The response and recovery times of the detector is very fast compared to GQD modified and pristine ZnO nanorod based detectors. Our UV detector also demonstrated higher photocurrent even at lower intensity range of incident light.