Enhancement of the photocurrent in ultraviolet photodetectors fabricated utilizing hybrid polymer-ZnO quantum dot nanocomposites due to an embedded graphene layer

Hee Yeon Yang, Dong Ick Son, Tae Whan Kim, Jung Min Lee, Won Il Park

Research output: Contribution to journalArticle

43 Scopus citations

Abstract

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 108 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.

Original languageEnglish
Pages (from-to)1313-1317
Number of pages5
JournalOrganic Electronics
Volume11
Issue number7
DOIs
StatePublished - 2010 Jul

Keywords

  • Carrier transport mechanism
  • Graphene
  • Photocurrent
  • Photodetector
  • Polymer-ZnO

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