title: Improved injection in n-type organic transistors with conjugated polyelectrolytes.
abstract: 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-C(61) 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.
authors.affiliation: Center for Polymers and Organic Solids, University of California, Santa Barbara, California 93106, USA.
authors.forename: Jung Hwa
authors.initials: JH
authors.lastname: Seo
authors.forename: Andrea
authors.initials: A
authors.lastname: Gutacker
authors.forename: Bright
authors.initials: B
authors.lastname: Walker
authors.forename: Shinuk
authors.initials: S
authors.lastname: Cho
authors.forename: Andres
authors.initials: A
authors.lastname: Garcia
authors.forename: Renqiang
authors.initials: R
authors.lastname: Yang
authors.forename: Thuc-Quyen
authors.initials: TQ
authors.lastname: Nguyen
authors.forename: Alan J
authors.initials: AJ
authors.lastname: Heeger
authors.forename: Guillermo C
authors.initials: GC
authors.lastname: Bazan