Ultraviolet photodetectors based on colloidal ZnO quantum dot-graphene nanocomposites
- Ultraviolet photodetectors based on colloidal ZnO quantum dot-graphene nanocomposites
- 이규승; 손동익; 이상현; 배수강; 문병준
- Issue Date
- ZnO nanoparticles have emerged as excellent candidates due to potential applications in ultraviolet (UV) photodetector devices with a high photoresponse. Currently, the UV photodetectors based on ZnO nanomaterials have been of current interest because of their potential applications in next-generation optoelectronic devices, such as sensors, optical communication systems, and missile launch detectors.
Due to high conductivity, good transparency, and high chemical and thermal stability, the graphene layers have emerged as excellent planar electrodes for promising applications in next-generation electronic and optoelectronic devices. The graphene layers play very important roles as carrier transport layers and as electrodes for ultrafast photodetectors.
In this study, Ultraviolet (UV) photodetectors were fabricated using the wet spin-coating for ZnO quantum dots (QDs) and the transfer method for the graphene sheet. High-resolution transmission electron microscopy images showed that the ZnO QDs were uniformly distributed between the voids of the surface circumferences on the graphene layers. Current-voltage measurements on the UV photodetector at 300K showed that the ratio of the photocurrent to the dark current was about 1.1×104. The rise and the decay times of the UV photodetector were approximately 2 and 1 s, respectively.
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