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Optical and Electronic Contributions in Double-Heterojunction Organic Thin-Film Solar Cells


  • The research project was funded by the German Science Foundation DFG (SFB 481).


Combinatorial studies of organic thin-film photovoltaic cells (see Figure) can identify the separate optical and electronic contributions to the photocurrent. A second charge-transfer zone is proposed to explain the observed augmentation of the short-circuit current induced by an additional TiO2 layer. The ratio of the exciton diffusion lengths in copper phthalocyanine (CuPc) and a perylene dye (DMPTI) is estimated to be ≈ 8:5.

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