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Published Online: 28 March 2011
Accepted: February 2011

Relation of open circuit voltage to charge carrier density in organic bulk heterojunction solar cells

Appl. Phys. Lett. 98, 133301 (2011); https://doi.org/10.1063/1.3566979
Daniel Rauh1, a), Alexander Wagenpfahl2, Carsten Deibel2, and Vladimir Dyakonov1,2, b)
more...View Affiliations
  • Original article: APL: Organic Electronics and Photonics 4 (3), 69 (2011)
    • ABSTRACT
    The open circuit voltage Voc and the corresponding charge carrier density were measured in dependence of temperature and illumination intensity by current–voltage and charge extraction measurements for poly(3-hexylthiophene-2,5-diyl) (P3HT):[6,6]-phenyl-C61 butyric acid methyl ester (PCBM) and P3HT:bisPCBM solar cells. At lower temperatures a saturation of Voc was observed which can be explained by energetic barriers at the contacts (metal–insulator–metal model). Such injection barriers can also influence Voc at room temperature and limit the performance of the working solar cell, as was assured by macroscopic device simulations on temperature dependent IV characteristics. However, under most conditions—room temperature and low barriers—Voc is given by the effective band gap.
    D.R.’s work is financed by the European Commission in the framework of the Dephotex Project (Grant No. 214459). C.D. gratefully acknowledges the support of the Bavarian Academy of Sciences and Humanities. V.D.’s work at the ZAE Bayern is financed by the Bavarian Ministry of Economic Affairs, Infrastructure, Transport and Technology.

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