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Influence of the contact interface on the electrical characteristics of a ZnO microwire with silver paste electrodes.pdf

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Influence of the contact interface on the electrical characteristics of a ZnO microwire with silver paste electrodes.pdf

Journal of Alloys and Compounds 681 (2016) 75e80 Contents lists available at ScienceDirect Journal of Alloys and Compounds journal homepage: /locate/jalcom In?uence of the contact interface on the electrical characteristics of a ZnO microwire with silver paste electrodes Jung Han Kim a, b, Hee-Suk Chung b, **, Kyu Hwan Oh a, Tae-Sung Bae b, Woong-Ki Hong b, * a Department of Materials Science and Engineering, Seoul National University, Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea b Jeonju Center, Korea Basic Science Institute, Jeonju, Jeollabuk-do, 54907, Republic of Korea article info Article history: Received 24 February 2016 Received in revised form 19 April 2016 Accepted 20 April 2016 Available online 22 April 2016 Keywords: ZnO microwire Ag paste Contact interface Electrical properties abstract We investigate the in?uence of the contact interface on the electrical properties of a ZnO microwire (MW) with silver (Ag) paste electrodes. The ZnO MW devices that are produced by dropping Ag paste on the ZnO MW surface followed by a curing step at an elevated temperature exhibit linear current-voltage characteristics, whereas the devices with Ag paste electrodes dropped upon a heated ZnO MW exhibit a non-linear electrical behavior. The results of electron microscopy and cathodoluminescence show the effect of the contact interface properties, such as interfacial defects and/or charge trap sites, between the ZnO MW and Ag paste electrodes. An energy band model is suggested to explain the charge transport mechanism for different types of Ag contacts on the ZnO MW. ? 2016 Elsevier B.V. All rights reserved. 1. Introduction Zinc oxide (ZnO), a direct semiconductor with a wide band gap of 3.3 eV, has recently been considered as a promising material for device applications in electronics, optoelectronics, and the emerging ?eld called nanopiezotronics [1e4]. In particular, single ZnO microwires (MWs) have attracted signi?cant attention as a means of understanding elect