Comment on "Interface state recombination in organic solar cells"

Details Comment on "Interface state recombination in organic solar cells" Comment on "Interface state recombination in organic solar cells"

2010-06-24

arxiv.org/abs/1006.4813v4

Phys. Rev. B 82, 207301 (2010)

Physics

Condensed Matter

Materials Science

4 pages, 2 figures. Corrected Eqns. (2) and (4): 1/... was missing

Scientific paper

10.1103/PhysRevB.82.207301

In a recent paper, Street et al. [Phys. Rev. B 81, 205307 (2010)] propose first order recombination due to interface states to be the dominant loss mechanism in organic bulk heterojunction solar cells, based on steady-state current--voltage characteristics. By applying macroscopic simulations, we found that under typical solar cell conditions, monomolecular or bimolecular recombination cannot be inferred from the slope of the light intensity dependent photocurrent. In addition, we discuss the validity of calculating a mobility--lifetime product from steady-state measurements. We conclude that the experimental technique applied by Street et al. is not sufficient to unambiguously determine the loss mechanism.

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