Graphene Quantum Dot-Sensitized ZnO-Nanorod/GaN-Nanotower Heterostructure-Based High-Performance UV Photodetectors.
ACS Appl Mater Interfaces
; 12(41): 47038-47047, 2020 Oct 14.
Article
em En
| MEDLINE
| ID: mdl-32957784
ABSTRACT
The fabrication of a superior-performance ultraviolet (UV) photodetector utilizing graphene quantum dots (GQDs) as a sensitization agent on a ZnO-nanorod/GaN-nanotower heterostructure has been realized. GQD sensitization displays substantial impact on the electrical as well as the optical performance of a heterojunction UV photodetector. The GQD sensitization stimulates charge carriers in both ZnO and GaN and allows energy band alignment, which is realized by a spontaneous time-correlated transient response. The fabricated device demonstrates an excellent responsivity of 3.2 × 103 A/W at -6 V and displays an enhancement of â¼265% compared to its bare counterpart. In addition, the fabricated heterostructure UV photodetector exhibits a very high external quantum efficiency of 1.2 × 106%, better switching speed, and signal detection capability as low as â¼50 fW.
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MEDLINE
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En
Ano de publicação:
2020
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Article