Photovoltaic Effect in Heterostructure Consisting of Poly(p-phenylene vinylene) Derivative and Polypyridine

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The characteristics of a photovoltaic device based on a heterostructure consisting of poly(2-methoxy-5-dodecyloxy-p-phenylene vinylene)(MDOPPV) and polypyridine(PPy) have been studied. The heterostructure device shows a significant enhancement of the photovoltaic properties compared to the single-layer divices based on MDOPPV or PPy. For example, the device shows a significantly larger photocurrent than a device consisting only of MDOPPV. Moreover, notable quenching of the photoluminescence of the two polymers due to lamination has also been observed. These results indicate that a photoinduced charge transfer occurs between MDOPPV and PPy. However, the photoinduced charge transfer between these polymers cannot be explained by the bulk electronic energy structure of the polymers estimated from the optical absorption and the atmospheric photoemission spectra. A possible mechanism, which takes modulation of electronic energy structure at the interface due to a local lattice distortion into account, has been proposed. Another possible mechanism of the enhanced carrier generation based on the polarization at the MDOPPV/PPy interface is also mentioned.
社団法人応用物理学会の論文
2000-06-15