Journal
ORGANIC ELECTRONICS
Volume 11, Issue 10, Pages 1693-1700Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.orgel.2010.07.016
Keywords
Organic solar cells; Oxygen; Degradation; TSC; CELIV; Macroscopic simulation
Funding
- Bundesministerium fur Bildung und Forschung [03SF0334F]
- Bavarian Academy of Sciences and Humanities
- Bavarian Ministry of Economic Affairs, Infrastructure, Transport and Technology
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We investigated the influence of oxygen on the performance of P3HT:PCBM (poly(3-hexylthiophene):[6,6]-phenyl C61 butyric acid methyl ester) solar cells by current-voltage, thermally stimulated current (TSC) and charge extraction by linearly increasing voltage (CELIV) measurement techniques. The exposure to oxygen leads to an enhanced charge carrier concentration and a decreased charge carrier mobility. Further, an enhanced formation of deeper traps was observed, although the overall density of traps was found to be unaffected upon oxygen exposure. With the aid of macroscopic simulations, based on solving the differential equation system of Poisson, continuity and drift-diffusion equations in one dimension, we demonstrate the influence of a reduced charge carrier mobility and an increased charge carrier density on the main solar cell parameters, consistent with experimental findings. (C) 2010 Elsevier B.V. All rights reserved.
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