Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 46, Pages 31822-31831Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b09766
Keywords
ZnO nanorods; graphene quantum dots; PEDOT:PSS; Schottky diode; UV detector; external quantum efficiency (EQE)
Funding
- CSIR, Government of India [03(1316)/14/EMR-II]
Ask authors/readers for more resources
Graphene quantum dot (GQD)-sensitized ZnO nanorods/poly(3,4-ethylenedioxythiophene) polystyrenesulfonate (PEDOT:PSS) Schottky junction has been fabricated for visible-blind ultraviolet (UV) photodetector applications. Schottky diode parameters such as ideality factor, effective work function, and series resistance have been studied for GQD-modified and pristine ZnO nanorod-based devices. Under illumination of broadband light of intensity 80 mW/cm(2), GQD-sensitized samples showed 11 times higher photocurrent value compared to pristine ZnO at -0.75 V external bias. GQD-modified detector demonstrated maximum photocurrent at UV region (wavelength similar to 340 nm) for all reverse bias voltages. ZnO nanorods/polymer Schottky junction UV detectors revealed high external quantum efficiency (EQE) more than 100%. Interestingly, GQD sensitized nanorod-based device demonstrated high EQE value of 13,161% at -1 V bias (wavelength similar to 340 nm), which is eight times higher than pristine ZnO NR-based detector. GQD-modified detectors also showed superior responsivity (36 A/W), detectivity (1.3 X 10(12) Hz(1/2)/W) at -1 V bias under incident of light of wavelength 340 nm. Even at very low intensity of UV light (0.07 mW/cm2), GQD-modified UV detectors showed high photocurrent (similar to 7.0 mA/cm(2)).
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available