Graphene Quantum Dot-Sensitized ZnO-Nanorod/GaN-Nanotower Heterostructure-Based High-Performance UV Photodetectors
Lalit Goswami, Neha Aggarwal, Rajni Verma, Swati Bishnoi, Sudhir Husale, Rajeshwari Pandey, Govind Gupta
ACS Applied Materials & Interfaces | AMER CHEMICAL SOC | Published : 2020
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 ∼265% compared to its bare counterpart. In addition, the fabricated h..View full abstract
Awarded by DST
The authors gratefully acknowledge Director, CSIR-NPL, New Delhi, for his encouragement and support. This work was supported by DST via grant DST/TM/CERI/C245 (G)/2016. N.A. would like to acknowledge CSIR for providing fellowship via a CSIR-Research Associateship.