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

doi:10.1021/ja908441c

Improved injection in n-type organic transistors with conjugated polyelectrolytes

J Am Chem Soc. 2009 Dec 30;131(51):18220-1. doi: 10.1021/ja908441c.

Authors

Jung Hwa Seo¹, Andrea Gutacker, Bright Walker, Shinuk Cho, Andres Garcia, Renqiang Yang, Thuc-Quyen Nguyen, Alan J Heeger, Guillermo C Bazan

Affiliation

¹ Center for Polymers and Organic Solids, University of California, Santa Barbara, California 93106, USA.

PMID: 19968301
DOI: 10.1021/ja908441c

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.