Organic solar cells with an ultra thin organized hole transport layer
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Discotic liquid crystals (LC) are promising materials to manufacture devices for organic photovoltaic conversion. These molecules possess a mesophase permitting the fabrication of columnar films having particularly desirable properties of charge transport and exciton diffusion along the axes of the columns. After the deposition of an organic layer on the Indium Tin Oxide (ITO) substrate, a thermal annealing, up to the clarification temperature of the LC, is generally necessary to reach a uniform orientation of the columns. It generally leads to a pronounced droplet formation on the substrate if no surface treatment had been performed on the ITO prior to the film deposition. This paper deals with the study of how this partial dewetting can contribute to good solar cell performances with the formation of an ultra thin organized layer.
KeywordsSolar Cell Organic Solar Cell Ultra Thin Film Photocurrent Generation Exciton Diffusion
The authors are grateful to T. Ondarcuhu (CEMES, Toulouse) for his help in the AFM measurements and their interpretation.
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