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Distributed Bilayer Photovoltaics Based on Nematic Liquid Crystal Polymer Networks.

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Title: Distributed Bilayer Photovoltaics Based on Nematic Liquid Crystal Polymer Networks.
Authors: Wing C. Tsoi1, Mary O'Neill1, Matthew P. Aldred1, Stuart P. Kitney1, Panagiotis Vlachos1, Stephen M. Kelly1
Source: Chemistry of Materials. Nov2007, Vol. 19 Issue 23, p5475-5484. 10p.
Subjects: Photovoltaic power generation, Liquid crystals, Polymers, Electrons
Abstract: We discuss a liquid crystal composite approach to provide a distributed interface to vertically separate electron-donating and electron-accepting films in an organic photovoltaic device. Two different methods are used to prepare a nematic liquid crystal polymer network with a porous surface and electron-donating properties. This is infilled with an electron-accepting organic semiconductor to form a bilayer device. The interface is diffuse rather than localized so that more photogenerated excitons can reach it to generate charge before they recombine. Photoinduced absorption of a blend of the donor and acceptor materials confirms that excitons dissociate at the heterointerface. The spatial features of the diffuse interface are examined by Fourier analysis of topographic images. We find a correlation between the in-plane spatial frequencies of the interface and photovoltaic device performance. The device performance is investigated as a function of input irradiance. Any charge combination is monomolecular rather than bimolecular, and the monochromatic power conversion efficiency varies between 0.8% and 0.3% with input irradiance. Equivalent circuit analysis shows that this is limited by a high series resistance, a blocking contact, and nonoptimized spatial features of the porous interface. [ABSTRACT FROM AUTHOR]
Copyright of Chemistry of Materials is the property of American Chemical Society and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
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PubType: Academic Journal
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  Data: Distributed Bilayer Photovoltaics Based on Nematic Liquid Crystal Polymer Networks.
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  Data: <searchLink fieldCode="JN" term="%22Chemistry+of+Materials%22">Chemistry of Materials</searchLink>. Nov2007, Vol. 19 Issue 23, p5475-5484. 10p.
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  Data: <searchLink fieldCode="DE" term="%22Photovoltaic+power+generation%22">Photovoltaic power generation</searchLink><br /><searchLink fieldCode="DE" term="%22Liquid+crystals%22">Liquid crystals</searchLink><br /><searchLink fieldCode="DE" term="%22Polymers%22">Polymers</searchLink><br /><searchLink fieldCode="DE" term="%22Electrons%22">Electrons</searchLink>
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  Data: We discuss a liquid crystal composite approach to provide a distributed interface to vertically separate electron-donating and electron-accepting films in an organic photovoltaic device. Two different methods are used to prepare a nematic liquid crystal polymer network with a porous surface and electron-donating properties. This is infilled with an electron-accepting organic semiconductor to form a bilayer device. The interface is diffuse rather than localized so that more photogenerated excitons can reach it to generate charge before they recombine. Photoinduced absorption of a blend of the donor and acceptor materials confirms that excitons dissociate at the heterointerface. The spatial features of the diffuse interface are examined by Fourier analysis of topographic images. We find a correlation between the in-plane spatial frequencies of the interface and photovoltaic device performance. The device performance is investigated as a function of input irradiance. Any charge combination is monomolecular rather than bimolecular, and the monochromatic power conversion efficiency varies between 0.8% and 0.3% with input irradiance. Equivalent circuit analysis shows that this is limited by a high series resistance, a blocking contact, and nonoptimized spatial features of the porous interface. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Chemistry of Materials is the property of American Chemical Society and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1021/cm071727q
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      – Code: eng
        Text: English
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        PageCount: 10
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        Type: general
      – SubjectFull: Liquid crystals
        Type: general
      – SubjectFull: Polymers
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      – SubjectFull: Electrons
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      – TitleFull: Distributed Bilayer Photovoltaics Based on Nematic Liquid Crystal Polymer Networks.
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              Text: Nov2007
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              Y: 2007
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