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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Hänsel et al. (2003) studied this question.
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