Direct measurement of conjugated polymer electronic excitation energies using metal/polymer/metal structures

Journal Article · Fri Mar 01 00:00:00 EST 1996 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.76.1900· OSTI ID:284425

Campbell, I H; Hagler, T W; Smith, D L ^[1]; Ferraris, J P ^[2]

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1. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
2. The University of Texas at Dallas, Richardson, Texas 75083 (United States)

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{prime}-ethyl-hexyloxy)-1,4-phenylene vinylene] (MEH-PPV). For MEH-PPV, with an exciton absorption peak of 2.25 eV, our 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. {copyright} {ital 1996 The American Physical Society.}

• OSTI ID: 284425
• Journal Information: Physical Review Letters, Vol. 76, Issue 11; Other Information: PBD: Mar 1996
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COPOLYMERS
ABSORPTION SPECTRA
MIM JUNCTIONS
EXCITONS
ELECTRO-OPTICAL EFFECTS
PHOTOEMISSION
SCHOTTKY BARRIER DIODES
ENERGY GAP
ELECTRON TRANSFER
BINDING ENERGY