Molecular weight dependent bimolecular recombination in organic solar cells

Philippa, Bronson, Stolterfoht, Martin, White, Ronald D., Velusamy, Marrapan, Burn, Paul L., Meredith, Paul, and Pivrikas, Almantas (2014) Molecular weight dependent bimolecular recombination in organic solar cells. Journal of Chemical Physics, 141. 054903.

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Abstract

Charge carrier recombination is studied in operational organic solar cells made from the polymer:fullerene system PCDTBT:PC71BM (poly[N-9' '-heptadecanyl-2,7-carbazole-alt-5,5-(4',7'-di-2-thienyl-2',1',3'-benzothiadiazole)]: [6,6]-phenyl-C70-butyric acid methyl ester). A newly developed technique High Intensity Resistance dependent PhotoVoltage is presented for reliably quantifying the bimolecular recombination coefficient independently of variations in experimental conditions, thereby resolving key limitations of previous experimental approaches. Experiments are performed on solar cells of varying thicknesses and varying polymeric molecular weights. It is shown that solar cells made from low molecular weight PCDTBT exhibit Langevin recombination, whereas suppressed (non-Langevin) recombination is found in solar cells made with high molecular weight PCDTBT.

Item ID: 34572
Item Type: Article (Research - C1)
ISSN: 1089-7690
Funders: Australian Research Council (ARC), University of Queensland, Queensland Government
Projects and Grants: ARC DECRA DE120102271, ARC UQ ECR59-2011002311, ARC UQ NSRSF-201100273
Date Deposited: 14 Aug 2014 04:03
FoR Codes: 09 ENGINEERING > 0912 Materials Engineering > 091208 Organic Semiconductors @ 50%
02 PHYSICAL SCIENCES > 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics > 020201 Atomic and Molecular Physics @ 50%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970102 Expanding Knowledge in the Physical Sciences @ 100%
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