Application of a dual functional blocking layer for improvement of the responsivity in a self-powered UV photodetector based on TiO₂ nanotubes.

ABSTRACT: A layer of graphene quantum dots (GQDs) was applied on the photoanode of a self-powered photoelectrochemical (PEC) UV photodetector based on TiO₂ nanotubes (NTs). The GQDs layer acted as a dual functional layer and improved the photodetector performance by both UV light absorption and blocking the charge carriers recombination at the photoanode/electrolyte interface. The short circuit current density (Jsc) and thereby the responsivity of the PEC UV photodetector was enhanced by 473%. The highest value of the responsivity in this work obtained for the PEC UV photodetector with the dual functional GQDs layer was as much as 42.5 mA W^-1. This value is far better than previously reported responsivities of the PEC devices based on TiO₂ NTs as a photoanode.

SUBMITTER: Zare A 

PROVIDER: S-EPMC8963264 | biostudies-literature | 2022 Mar

REPOSITORIES: biostudies-literature