Unusual photoresponse of indium doped ZnO/organic thin film heterojunction

Sesha Vempati, Saraswathi Chirakkara, J. Mitra, Paul Dawson, Karuna Kar Nanda, S. B. Krupanidhi

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54 Citations (Scopus)


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. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4704655]

Original languageEnglish
Article number162104
Pages (from-to)-
Number of pages4
JournalApplied Physics Letters
Issue number16
Publication statusPublished - 16 Apr 2012


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