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Proceedings Paper

Photoluminescence studies on energy migration in multilayer organic photovoltaic devices based on ionically self-assembled monolayers
Author(s): Raoul Schroeder; C. Soman; Charles Brands; James Randy Heflin; Wilhelm Graupner; Hong Wang; Harry W. Gibson; Daniela Marciu; Michael B. Miller
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Paper Abstract

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.

Paper Details

Date Published: 5 February 2001
PDF: 12 pages
Proc. SPIE 4108, Organic Photovoltaics, (5 February 2001); doi: 10.1117/12.416935
Show Author Affiliations
Raoul Schroeder, Bowling Green State Univ. (United States)
C. Soman, Virginia Polytechnic Institute and State Univ. (United States)
Charles Brands, Virginia Polytechnic Institute and State Univ. (United States)
James Randy Heflin, Virginia Polytechnic Institute and State Univ. (United States)
Wilhelm Graupner, Virginia Polytechnic Institute and State Univ. (United States)
Hong Wang, Virginia Polytechnic Institute and State Univ. (United States)
Harry W. Gibson, Virginia Polytechnic Institute and State Univ. (United States)
Daniela Marciu, Luna Innovations, Inc. (United States)
Michael B. Miller, Luna Innovations, Inc. (United States)

Published in SPIE Proceedings Vol. 4108:
Organic Photovoltaics
Zakya H. Kafafi, Editor(s)

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