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http://dx.doi.org/10.4313/JKEM.2007.20.1.041

A Study on Space Charge of Organic Pentacene/metal Interface  

Yoon, Young-Woon (서강대학교 물리학과 바이오융합협동과정)
Babajayan, Arsen (서강대학교 물리학과 바이오융합협동과정)
Lee, Hoo-Neung (서강대학교 물리학과 바이오융합협동과정)
Kim, Song-Hui (서강대학교 물리학과 바이오융합협동과정)
Lee, Kie-Jin (서강대학교 물리학과 바이오융합협동과정)
Publication Information
Journal of the Korean Institute of Electrical and Electronic Material Engineers / v.20, no.1, 2007 , pp. 41-46 More about this Journal
Abstract
Surface potential properties at the interface of pentacene thin films on gold (Au) and aluminum (Al) surfaces were investigated by using a near-field scanning microwave microprobe (NSMM). The surface potential formed across the pentacene film was observed by measuring the microwave reflection coefficient $S_{11}$ and compared with the result of a Kelvin-probe method. The obtained reflection coefficient ${\Delta}S_{11}$ of the pentacene thin films on Al was decreased as the pentacene film thickness increased due to the increased accumulation of negative space charges, while for Au ${\Delta}S_{11}$ was essentially constant.
Keywords
Organic pentacene; Near-field microwave microscope; Kelvin-probe method; Reflction coefficient $S_{11}$; Surface potential;
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