Direct Measurement of Conjugated Polymer Electronic Excitation Energies Using Metal/Polymer/Metal Structures

I. H. Campbell, T. W. Hagler, D. L. Smith, and J. P. Ferraris
Phys. Rev. Lett. 76, 1900 – Published 11 March 1996
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Abstract

We report electroabsorption measurements of built-in electric fields and internal photoemission measurements of Schottky barriers to determine the charge transfer and single-particle energy gaps of the conjugated polymer poly[2-methoxy, 5-(2′-ethyl-hexyloxy)-1,4-phenylene vinylene] (MEH-PPV). For MEH-PPV, with an exciton absorption peak of 2.25 eV, or results yield a single-particle energy gap of 2.45 eV and a charge transfer energy gap of at least 2.35 eV. Therefore the exciton binding energy is 0.2 eV and the bipolaron binding energy is less than 0.1 eV.

  • Received 25 May 1995

DOI:https://doi.org/10.1103/PhysRevLett.76.1900

©1996 American Physical Society

Authors & Affiliations

I. H. Campbell, T. W. Hagler, and D. L. Smith

  • Los Alamos National Laboratory, Los Alamos, New Mexico 87545

J. P. Ferraris

  • The University of Texas at Dallas, Richardson, Texas 75083

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Vol. 76, Iss. 11 — 11 March 1996

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