Unusual photoresponse of indium doped ZnO/organic thin film heterojunction
- 16 April 2012
- journal article
- conference paper
- Published by AIP Publishing in Applied Physics Letters
- Vol. 100 (16) , 162104
Abstract
Photoresponse of n-type indium-doped ZnO and a p-type polymer (PEDOT:PSS) heterojunction devices are studied, juxtaposed with the photoluminescence of the In-ZnO samples. In addition to the expected photoresponse in the ultraviolet, the heterojunctions exhibit significant photoresponse to the visible (532 nm). However, neither the doped ZnO nor PEDOT:PSS individually show any photoresponse to visible light. The sub-bandgap photoresponse of the heterojunction originates from visible photon mediated e-h generation between the In-ZnO valence band and localized states lying within the band gap. Though increased doping of In-ZnO has limited effect on the photoluminescence, it significantly diminishes the photoresponse. The study indicates that optimally doped devices are promising for the detection of wavelengths in selected windows in the visible.Keywords
This publication has 28 references indexed in Scilit:
- Ultralow-frequency photocurrent oscillation in ZnO nanowiresApplied Physics Letters, 2010
- Visible Light Response of Unintentionally Doped ZnO Nanowire Field Effect TransistorsThe Journal of Physical Chemistry C, 2009
- Zero-biased near-ultraviolet and visible photodetector based on ZnO nanorods/n-Si heterojunctionApplied Physics Letters, 2009
- Visible and ultraviolet light alternative photodetector based on ZnO nanowire/n-Si heterojunctionApplied Physics Letters, 2008
- Near-ultraviolet photodetector based on hybrid polymer/zinc oxide nanorods by low-temperature solution processesApplied Physics Letters, 2008
- ZnO/polyaniline based inorganic/organic hybrid structure: Electrical and photoconductivity propertiesApplied Physics Letters, 2008
- Giant Enhancement in UV Response of ZnO Nanobelts by Polymer Surface-FunctionalizationJournal of the American Chemical Society, 2007
- Ultraviolet and visible photoresponse properties of n-ZnO∕p-Si heterojunctionJournal of Applied Physics, 2007
- Hole transport in conducting ultrathin films of PEDOT/PSS prepared by layer-by-layer deposition techniquePolymer, 2004
- Nanowire Ultraviolet Photodetectors and Optical SwitchesAdvanced Materials, 2002