Advantage of suppressed non-Langevin recombination in low mobility organic solar cells

Stolterfoht, Martin, Philippa, Bronson, Armin, Ardalan, Pandey, Ajay K., White, Ronald D., Burn, Paul L., Meredith, Paul, and Pivrikas, Almantas (2014) Advantage of suppressed non-Langevin recombination in low mobility organic solar cells. Applied Physics Letters, 105 (1). 013302.

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Abstract

Photovoltaic performance in relation to charge transport is studied in efficient (7.6%) organic solar cells (PTB7:PC71BM). Both electron and hole mobilities are experimentally measured in efficient solar cells using the resistance dependent photovoltage technique, while the inapplicability of classical techniques, such as space charge limited current and photogenerated charge extraction by linearly increasing voltage is discussed. Limits in the short-circuit current originate from optical losses, while charge transport is shown not to be a limiting process. Efficient charge extraction without recombination can be achieved with a mobility of charge carriers much lower than previously expected. The presence of dispersive transport with strongly distributed mobilities in high efficiency solar cells is demonstrated. Reduced non-Langevin recombination is shown to be beneficial for solar cells with imbalanced, low, and dispersive electron and hole mobilities.

Item ID: 34335
Item Type: Article (Research - C1)
ISSN: 1077-3118
Funders: Australian Research Council (ARC), University of Queensland (UQ), Australian Renewable Energy Agency (ARENA), Queensland Government
Projects and Grants: ARC DECRA DE120102271, UQ ECR59-201100231, UQ NSRSF-201100273
Date Deposited: 31 Jul 2014 04:46
FoR Codes: 02 PHYSICAL SCIENCES > 0204 Condensed Matter Physics > 020404 Electronic and Magnetic Properties of Condensed Matter; Superconductivity @ 100%
SEO Codes: 85 ENERGY > 8505 Renewable Energy > 850504 Solar-Photovoltaic Energy @ 100%
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