Photocarrier drift distance in organic solar cells and photodetectors

Stolterfoht, Martin, Armin, Ardalan, Philippa, Bronson, White, Ronald D., Burn, Paul L., Meredith, Paul, Juška, Gytis, and Pivrikas, Almantas (2015) Photocarrier drift distance in organic solar cells and photodetectors. Scientific Reports, 5. 9949. pp. 1-7.

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Light harvesting systems based upon disordered materials are not only widespread in nature, but are also increasingly prevalent in solar cells and photodetectors. Examples include organic semiconductors, which typically possess low charge carrier mobilities and Langevin-type recombination dynamics – both of which negatively impact the device performance. It is accepted wisdom that the "drift distance" (i.e., the distance a photocarrier drifts before recombination) is defined by the mobility-lifetime product in solar cells. We demonstrate that this traditional figure of merit is inadequate for describing the charge transport physics of organic light harvesting systems. It is experimentally shown that the onset of the photocarrier recombination is determined by the electrode charge and we propose the mobility-recombination coefficient product as an alternative figure of merit. The implications of these findings are relevant to a wide range of light harvesting systems and will necessitate a rethink of the critical parameters of charge transport.

Item ID: 42387
Item Type: Article (Research - C1)
ISSN: 2045-2322
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Date Deposited: 04 Feb 2016 03:05
FoR Codes: 09 ENGINEERING > 0906 Electrical and Electronic Engineering > 090605 Photodetectors, Optical Sensors and Solar Cells @ 100%
SEO Codes: 85 ENERGY > 8505 Renewable Energy > 850504 Solar-Photovoltaic Energy @ 100%
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