The impact of hot charge carrier mobility on photocurrent losses in polymer-based solar cells

Philippa, Bronson, Stolterfoht, Martin, Burn, Paul L., Juška, Gytis, Meredith, Paul, White, Ronald D., and Pivrikas, Almantas (2014) The impact of hot charge carrier mobility on photocurrent losses in polymer-based solar cells. Scientific Reports, 4. 5695.

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A typical signature of charge extraction in disordered organic systems is dispersive transport, which implies a distribution of charge carrier mobilities that negatively impact on device performance. Dispersive transport has been commonly understood to originate from a time-dependent mobility of hot charge carriers that reduces as excess energy is lost during relaxation in the density of states. In contrast, we show via photon energy, electric field and film thickness independence of carrier mobilities that the dispersive photocurrent in organic solar cells originates not from the loss of excess energy during hot carrier thermalization, but rather from the loss of carrier density to trap states during transport. Our results emphasize that further efforts should be directed to minimizing the density of trap states, rather than controlling energetic relaxation of hot carriers within the density of states.

Item ID: 34334
Item Type: Article (Research - C1)
ISSN: 2045-2322
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Funders: Australian Research Council (ARC), University of Queensland (UQ), European Social Fund, Queensland Government
Projects and Grants: ARC DECRA DE120102271, UQ ECR59-2011002311, UQ NSRSF-2011002734
Date Deposited: 07 Aug 2014 03:31
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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