Phys. Rev. Lett. 76, 1900–1903 (1996)Direct Measurement of Conjugated Polymer Electronic Excitation Energies Using Metal/Polymer/Metal StructuresReceived 25 May 1995; published in the issue dated 11 March 1996 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. © 1996 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.76.1900
DOI:
10.1103/PhysRevLett.76.1900
PACS:
71.20.Rv, 71.35.Cc, 71.38.+i, 73.61.Ph
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