title: Solution-processed graphene quantum dot deep-UV photodetectors.
abstract: Fast-response and high-sensitivity deep-ultraviolet (DUV) photodetectors with detection wavelength shorter than 320 nm are in high demand due to their potential applications in diverse fields. However, the fabrication processes of DUV detectors based on traditional semiconductor thin films are complicated and costly. Here we report a high-performance DUV photodetector based on graphene quantum dots (GQDs) fabricated via a facile solution process. The devices are capable of detecting DUV light with wavelength as short as 254 nm. With the aid of an asymmetric electrode structure, the device performance could be significantly improved. An on/off ratio of ∼6000 under 254 nm illumination at a relatively weak light intensity of 42 μW cm(-2) is achieved. The devices also exhibit excellent stability and reproducibility with a fast response speed. Given the solution-processing capability of the devices and extraordinary properties of GQDs, the use of GQDs will open up unique opportunities for future high-performance, low-cost DUV photodetectors.
authors.affiliation: Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University , Suzhou, Jiangsu 215123, P. R. China.
authors.forename: Qing
authors.initials: Q
authors.lastname: Zhang
authors.forename: Jiansheng
authors.initials: J
authors.lastname: Jie
authors.forename: Senlin
authors.initials: S
authors.lastname: Diao
authors.forename: Zhibin
authors.initials: Z
authors.lastname: Shao
authors.forename: Qiao
authors.initials: Q
authors.lastname: Zhang
authors.forename: Liu
authors.initials: L
authors.lastname: Wang
authors.forename: Wei
authors.initials: W
authors.lastname: Deng
authors.forename: Weida
authors.initials: W
authors.lastname: Hu
authors.forename: Hui
authors.initials: H
authors.lastname: Xia
authors.forename: Xiaodong
authors.initials: X
authors.lastname: Yuan
authors.forename: Shuit-Tong
authors.initials: ST
authors.lastname: Lee
keywords: asymmetric electrodes; deep-UV; graphene; photodetectors; quantum dots