Enhancement of the photocurrent in ultraviolet photodetectors fabricated utilizing hybrid polymer-ZnO quantum dot nanocomposites due to an embedded graphene layer
✍ Scribed by Hee Yeon Yang; Dong Ick Son; Tae Whan Kim; Jung Min Lee; Won Il Park
- Book ID
- 103877424
- Publisher
- Elsevier Science
- Year
- 2010
- Tongue
- English
- Weight
- 538 KB
- Volume
- 11
- Category
- Article
- ISSN
- 1566-1199
No coin nor oath required. For personal study only.
✦ Synopsis
Transmission electron microscopy images of ultraviolet (UV) photodetectors based on hybrid polymer-ZnO quantum dots (QDs) incorporating graphene showed that the ZnO QDs were distributed at the circumference of the surface of the poly-N-vinylcarbazole (PVK) layer and that the graphene layer were attached to the surface of the ZnO QDs and PVK layer. Current-voltage (I-V) measurements on the UV photodetectors showed that the ratio of the photocurrent to the dark current was approximately 10 8 and that the photocurrent was significantly enhanced by using the graphene layer. The carrier transport mechanisms of the UV photodetectors are described on the basis of the I-V results.