5 February 2001 Photoluminescence studies on energy migration in multilayer organic photovoltaic devices based on ionically self-assembled monolayers
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We report the fabrication of thin organic layers and photovoltaic devices made from them. Building thin layers of organic materials via the method of ionically self-assembled monolayers provides control over the layer thickness and composition of multilayer structures on a nanometer scale. This allows to accurately dope a photoluminescent host material with energy or charge accepting guests, changing the emissive character of the pure photoluminescent host film to a predominantly non-emissive, charge generating structure. We show that by varying the concentration of the guest Copper phthalocyanine and C60(OH)2 in poly- (para-phenylene-vinylene) we can measure the energy migration as well as dissociation of the exciton and can determine the lifetime and the diffusion radius of the exciton. Increasing the number of dopands in the host material, the photoluminescence emission spectra shift and decrease in intensity reflecting a decrease in the number of excitons transferring to neighboring chains or conjugation segments. For high dopand concentrations the recombination of excitons only happens on the same chain as the generation. Building a device to achieve the optimal guest/host ratio for optimal exciton dissociation is one important step in the design of high efficiency photovoltaic devices.
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Raoul Schroeder, Raoul Schroeder, C. Soman, C. Soman, Charles Brands, Charles Brands, James Randy Heflin, James Randy Heflin, Wilhelm Graupner, Wilhelm Graupner, Hong Wang, Hong Wang, Harry W. Gibson, Harry W. Gibson, Daniela Marciu, Daniela Marciu, Michael B. Miller, Michael B. Miller, "Photoluminescence studies on energy migration in multilayer organic photovoltaic devices based on ionically self-assembled monolayers", Proc. SPIE 4108, Organic Photovoltaics, (5 February 2001); doi: 10.1117/12.416935; https://doi.org/10.1117/12.416935

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