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Metastable polaron supporting phase in poly-p-phenylene films induced by UV illumination

Authors
  • Drori, T.
  • Gershman, E.
  • Sheng, C. X.
  • Eichen, Y.
  • Vardeny, Z. V.
  • Ehrenfreund, E.
Type
Published Article
Publication Date
Aug 22, 2006
Submission Date
Aug 22, 2006
Identifiers
DOI: 10.1103/PhysRevB.76.033203
arXiv ID: cond-mat/0608471
Source
arXiv
License
Unknown
External links

Abstract

We discovered a new metastable polaron-supporting phase in pristine films of a soluble derivative of poly-p-phenylene vinylene (MEH-PPV) that is induced by UV illumination. In the initial un-illuminated phase A, the films do not show long-lived photogenerated polarons. However, prolonged UV illumination for several hours induces a reversible, me-tastable phase B that shows abundant long-lived photogenerated polarons. Phase B films transform back to the original phase A within 1/2 hour in the dark at room temperature. We propose a reversible mechanism in which UV illumination creates metastable deep defects that substantially increase the photogenerated polaron lifetime.

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