Doping-induced screening of the built-in-field in organic solar cells: effect on charge transport and recombination

Armin, Ardalan, Juska, Gytis, Philippa, Bronson W., Burn, Paul L., Meredith, Paul, White, Ronald D., and Pivrikas, Almantas (2013) Doping-induced screening of the built-in-field in organic solar cells: effect on charge transport and recombination. Advanced Energy Materials, 3 (3). pp. 321-327.

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Abstract

We report on the effects of screening of the electric field by doping-induced mobile charges on photocurrent collection in operational organic solar cells. Charge transport and recombination were studied using double injection (DI) and charge extraction by linearly increasing voltage (CELIV) transient techniques in bulk-heterojunction solar cells made from acceptor-donor blends of poly(3-n-hexylthiophene):phenyl-C61-butyric acid methyl ester (P3HT:PC60BM). It is shown that the screening of the built-in field in operational solar cells can be controlled by an external voltage while the influence on charge transport and recombination is measured. An analytical theory to extract the bimolecular recombination coefficient as a function of electric field from the injection current is also reported. The results demonstrate that the suppressed (non-Langevin) bimolecular recombination rate and charge collection are not strongly affected by native doping levels in this materials combination. Hence, it is not necessary to reduce the level of doping further to improve the device performance of P3HT-based solar cells.

Item ID: 28354
Item Type: Article (Research - C1)
ISSN: 1614-6840
Keywords: organic solar cells, charge carrier transport, bimolecular recombination, doping level, double injection
Funders: Australian Research Council (ARC), University of Queensland (UQ), Queensland Government, ARC Centre of Excellence for Antimatter-Matter Studies
Projects and Grants: ARC Discovery Early Career Researcher Award ARC DECRA DE120102271, ARC UQ ECR59-2011002311, ARC UQ NSRSF-2011002734
Date Deposited: 17 Jul 2013 05:29
FoR Codes: 02 PHYSICAL SCIENCES > 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics > 020201 Atomic and Molecular Physics @ 50%
02 PHYSICAL SCIENCES > 0204 Condensed Matter Physics > 020401 Condensed Matter Characterisation Technique Development @ 50%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970102 Expanding Knowledge in the Physical Sciences @ 100%
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