Journal
ORGANIC ELECTRONICS
Volume 7, Issue 6, Pages 452-456Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.orgel.2006.05.009
Keywords
exciton; diffusion; solar cell; photovoltaic; photophysics; MEH-PPV
Funding
- Engineering and Physical Sciences Research Council [GR/S62635/01, GR/S62628/01] Funding Source: researchfish
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We report time-resolved photoluminescence studies in MEH-PPV films for a wide range of excitation intensities. The results fit well to a diffusion-limited exciton-exciton annihilation model with an annihilation constant gamma = (2.8 +/- 0.5) x 10(-8) cm(3) s(-1). This enables us to estimate the exciton diffusion coefficient to be D = (3 +/- 1) x 10(-3) cm(2) s(-1). This corresponds to a diffusion length between 5 and 8 nm for one-dimensional diffusion. (c) 2006 Elsevier B.V. All rights reserved.
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