Discotic mesophase materials: Their use in organic field-effect transistors and organic photovoltaics

Neal R. Armstrong, Wei Xia, Britt Minch, Adam Simmonds, Chet Carter, Carrie L. Donley, Rebecca A.P. Zangmeister, Anthony Drager, Samir K. Cherian, Lynn LaRussa, Bernard Kippelen, Seunghyup Yoo, Benoit Domercq, David L. Mathine, David F. O'Brien

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations


New discotic mesophase materials, especially those based on phthalocyanines, have become increasingly interesting as charge transport and photoactive materials for new molecular electronic technologies (organic field-effect transistors (OFETs) and organic photovoltaics (OPVs)). Side chains added to the periphery of these molecules render them solution processable and enhance the coherence in their rod-like aggregates. It has been hypothesized that these columnar aggregates will provide for charge mobilities competitive with amorphous silicon (ca. 1 cm 2/volt-sec), when the coherence length exceeds ca. 100 nm, and the processing conditions lead to thin films with low charge trap densities, and good electrical contacts (source and drain electrodes in OFETs; anodes/cathodes In OPVs). Our work with octa-substituted phthalocyanines, where the alkoxy- or thio-ether-linked side chains are terminated with benzyl groups, has shown that it is possible to achieve the desired coherence and electrical properties on sub-micron length scales (measured by conductive-tip AFM), but that achieving the desired device properties still requires optimization to achieve i) low contact resistances, and ii) the proper column orientation for both OFET and OPVs.

Original languageEnglish (US)
Title of host publicationElectron Transfer in Nanomaterials - Proceedings of the International Symposium
Number of pages9
StatePublished - 2006
Externally publishedYes
Event205th Electrochemical Society Meeting - San Antonio, TX, United States
Duration: May 9 2004May 14 2004

Publication series

NameProceedings - Electrochemical Society
VolumePV 2004-22


Other205th Electrochemical Society Meeting
Country/TerritoryUnited States
CitySan Antonio, TX

ASJC Scopus subject areas

  • General Engineering


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