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Tuning the work function of polar zinc oxide surfaces using modified phosphonic acid self-assembled monolayers

  • Zinc oxide (ZnO) is regarded as a promising alternative material for transparent conductive electrodes in optoelectronic devices. However, ZnO suffers from poor chemical stability. ZnO also has a moderate work function (WF), which results in substantial charge injection barriers into common (organic) semiconductors that constitute the active layer in a device. Controlling and tuning the ZnO WF is therefore necessary but challenging. Here, a variety of phosphonic acid based self-assembled monolayers (SAMs) deposited on ZnO surfaces are investigated. It is demonstrated that they allow the tuning the WF over a wide range of more than 1.5 eV, thus enabling the use of ZnO as both the hole-injecting and electron-injecting contact. The modified ZnO surfaces are characterized using a number of complementary techniques, demonstrating that the preparation protocol yields dense, well-defined molecular monolayers.

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Author:Ilja Lange, Sina Reiter, Michael Paetzel, Anton Zykov, Alexei Nefedov, Jana Hildebrandt, Stefan Hecht, Stefan Kowarik, Christof Woell, Georg Heimel, Dieter NeherORCiDGND
ISSN:1616-301X (print)
ISSN:1616-3028 (online)
Parent Title (English):Advanced functional materials
Place of publication:Weinheim
Document Type:Article
Year of first Publication:2014
Year of Completion:2014
Release Date:2017/03/27
Tag:ZnO; electrodes; phosphonic acid; self-assembled monolayers; surface modification
First Page:7014
Last Page:7024
Funder:German Research Foundation (DFG) [SFB 951]; "Science and Technology of Nanosystems" Programme (Molecular Building Blocks/Supramolecular Networks) [431103]
Organizational units:Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie
Peer Review:Referiert