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

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

2006-08-22

arxiv.org/abs/cond-mat/0608471v1

Phys. Rev. B 76, 033203 (2007)

Physics

Condensed Matter

Other Condensed Matter

4 pages, 4 figures

Scientific paper

10.1103/PhysRevB.76.033203

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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