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Photocarrier drift distance in organic solar cells and photodetectors.


ABSTRACT: 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.

SUBMITTER: Stolterfoht M 

PROVIDER: S-EPMC4412075 | biostudies-literature | 2015 Apr

REPOSITORIES: biostudies-literature

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Photocarrier drift distance in organic solar cells and photodetectors.

Stolterfoht Martin M   Armin Ardalan A   Philippa Bronson B   White Ronald D RD   Burn Paul L PL   Meredith Paul P   Juška Gytis G   Pivrikas Almantas A  

Scientific reports 20150428


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-lifet  ...[more]

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