Infrared spectroscopy of organic semiconductors modified by self-assembled monolayers

ORAL

Abstract

Recently, self-assembled monolayers (SAMs) were used to modify electronic surface properties of organic single crystals, leading to several orders of magnitude increase in the electrical conductivity$^{1}$.~~Motivated by this discovery, the same technique was applied to polymers.~~Here we present a thorough spectroscopic investigation of organic semiconductors based on poly(3-hexlthiophene) (P3HT) that have been treated with a fluorinated trichlorosilane SAM.~~Infrared spectroscopy offers access to details of charge injection, electrostatic doping, and the electronic structure that are not always available from transport measurements, which can be dominated by defects and contact effects.~~In polymer films, the SAM molecules penetrate into the bulk, leading to a rich spectrum of electronic excitations in the mid-infrared energy range.~ $^{1}$~M. F.~Calhoun,~~J. Sanchez, D. Olaya, M. E. Gershenson, V. Podzorov\textit{,~Electronic functionalization of the surface of organic semiconductors with self-assembled monolayers},~Nature Mater$.$~\textbf{7}, 84--89 (2008)~

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Authors

  • O. Khatib

    University of California, San Diego

  • B. Lee

    Rutgers University

  • Vitaly Podzorov

    Rutgers University

  • J. Yuen

    University of California, Santa Barbara

  • A.J. Heeger

    University of California, Santa Barbara

  • Z.Q. Li

    University of California, San Diego, Univ. of CA, San Diego

  • M. Di Ventra

    Department of Physics, University of California, San Diego, University of California - San Diego, Department of Physics, University of California San Diego, La Jolla, California 92093-0319, USA, University of California, San Diego

  • Dmitri Basov

    UCSD, University of California San Diego, Univ. of CA, San Diego, University of California, San Diego