Improved Injection in n-Type Organic Transistors with Conjugated Polyelectrolytes

To improve injection in n-type organic thin film transistors (OTFTs), a thin conjugated polyelectrolyte (CPE) layer was interposed between electrodes and the semiconductor layer. OTFTs were fabricated with [6,6]-phenyl-C61 butyric acid methyl ester (PCBM) and Au source and drain contacts. We demonst...

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Published inJournal of the American Chemical Society Vol. 131; no. 51; pp. 18220 - 18221
Main Authors Seo, Jung Hwa, Gutacker, Andrea, Walker, Bright, Cho, Shinuk, Garcia, Andres, Yang, Renqiang, Nguyen, Thuc-Quyen, Heeger, Alan J, Bazan, Guillermo C
Format Journal Article
LanguageEnglish
Published United States American Chemical Society 30.12.2009
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Summary:To improve injection in n-type organic thin film transistors (OTFTs), a thin conjugated polyelectrolyte (CPE) layer was interposed between electrodes and the semiconductor layer. OTFTs were fabricated with [6,6]-phenyl-C61 butyric acid methyl ester (PCBM) and Au source and drain contacts. We demonstrate that the insertion of CPEs beneath top-contact Au source/drain electrodes can be a very effective strategy for improving the carrier injection and reducing turn-on threshold voltages of n-channel OTFTs. Ultraviolet photoemission spectroscopy (UPS) indicates that the decrease of the electron injection barrier is consistent with organized dipoles at the metal/organic interface.
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ISSN:0002-7863
1520-5126
DOI:10.1021/ja908441c