Recombination lifetime of free polarons in polymer/fullerene bulk heterojunction solar cells

The recombination lifetime of free polarons was measured using three different methods: electrical field-dependent photoresponse, transient photoconductivity, and forward-to-zero bias transient-current response. The average free polaron recombination lifetime is estimated to be a few microseconds fo...

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Bibliographic Details
Published in:Journal of applied physics 2012-02, Vol.111 (3), p.034503-034503-6
Main Authors: Li, Kejia, Li, Lijun, Campbell, Joe C.
Format: Article
Language:English
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Summary:The recombination lifetime of free polarons was measured using three different methods: electrical field-dependent photoresponse, transient photoconductivity, and forward-to-zero bias transient-current response. The average free polaron recombination lifetime is estimated to be a few microseconds for poly (3-hexylthiophene) (P3HT) and [6,6]-phenyl C61-butyric acid methyl ester (PCBM) solar cells. The competition between sweep-out by the internal field and the loss of photogenerated carriers by recombination is analyzed. The short-circuit free polaron collection efficiency for P3HT:PCBM bulk heterojunction material was determined to be in the range of 80% to 90%.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.3680879