Fully transparent vertically aligned ZnO nanostructure-based ultraviolet photodetectors with high responsivity

Byung Oh Jung, Dong Chan Kim, Bo Hyun Kong, Dong Wook Kim, Hyung Koun Cho

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

This study describes the fabrication of fully transparent ultraviolet (UV) photodetectors with high responsivities remarkably enhanced by introducing thin insulating MgO (i-MgO) layers, highly dense ZnO nanostructures, and the direct contact of the ITO electrode with the nanostructures. The i-MgO layers and the ZnO nanostructures were grown by metal organic chemical vapor deposition, and the morphology of the ZnO nanostructures exhibited structural transitions (nanowires → nanowalls → films) depending on the thickness of the MgO layers. For the construction of a fully transparent device structure, the whole surface of the nanostructures was covered with two dimensional ITO top electrodes. The sample with a 12 nm thick i-MgO layer had high-density nanowall structures and exhibited a dramatically improved UV photo-detecting performance (photo-to-dark current ratio of 7143, recovery time of 220 ms, responsivity of 290 A/W, and high transmittance of approximately 90% in the visible region). A detailed discussion regarding the fully transparent UV photo-detecting mechanism developed by the i-MgO layers and highly dense nanostructures is presented in this work.

Original languageEnglish
Pages (from-to)740-746
Number of pages7
JournalSensors and Actuators, B: Chemical
Volume160
Issue number1
DOIs
StatePublished - 15 Dec 2011

Bibliographical note

Funding Information:
This work was financially supported by the Pioneer Research Center Program through the National Research Foundation of Korea (grant nos. 2011-0000082 and 2011-0001650) funded by the Ministry of Education, Science and Technology (MEST). This research was also financially supported by the Ministry of Knowledge Economy (MKE) and this work is financially supported by the Ministry of Knowledge Economy (MKE) and Korea Institute for Advancement of Technology (KIAT) through the Workforce Development Program in Strategic Technology and this research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by Ministry of Education, Science and Technology (2011-0009494).

Keywords

  • MgO
  • Nanowall
  • Nanowire
  • Photodetector
  • Ultraviolet
  • ZnO

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