Improved injection in n-type organic transistors with conjugated polyelectrolytes

Jung Hwa Seo, Andrea Gutacker, Bright Walker, Shinuk Cho, Andres Garcia, Renqiang Yang, Thuc Quyen Nguyen, Alan J. Heeger, Guillermo C. Bazan

Research output: Contribution to journalArticlepeer-review

112 Scopus citations


(Chemical Equation Presented) 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.

Original languageEnglish
Pages (from-to)18220-18221
Number of pages2
JournalJournal of the American Chemical Society
Issue number51
StatePublished - 30 Dec 2009


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