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Controlling J-aggregate formation for increased short-circuit current and power conversion efficiency with a squaraine donor

Authors

  • Susan Spencer,

    Corresponding author
    1. Nanopower Research Laboratories, Golisano Institute for Sustainability, Rochester Institute of Technology, Rochester, NY, USA
    • Correspondence: Susan Spencer, Nanopower Research Laboratories, Golisano Institute for Sustainability, Rochester Institute of Technology, Rochester, NY, USA.

      E-mail: sxs7565@rit.edu

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  • Harry Hu,

    1. Nanopower Research Laboratories, Golisano Institute for Sustainability, Rochester Institute of Technology, Rochester, NY, USA
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  • Qimeng Li,

    1. Nanopower Research Laboratories, Golisano Institute for Sustainability, Rochester Institute of Technology, Rochester, NY, USA
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  • Hyo-Yang Ahn,

    1. Department of Chemistry, University of Central Florida, Orlando, FL, USA
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  • Maher Qaddoura,

    1. Department of Chemistry, University of Central Florida, Orlando, FL, USA
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  • Sheng Yao,

    1. Department of Chemistry, University of Central Florida, Orlando, FL, USA
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  • Andronique Ioannidis,

    1. Nanopower Research Laboratories, Golisano Institute for Sustainability, Rochester Institute of Technology, Rochester, NY, USA
    2. Department of Chemistry, Rochester Institute of Technology, Rochester, NY, USA
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  • Kevin Belfield,

    1. Department of Chemistry, University of Central Florida, Orlando, FL, USA
    2. The College of Optics and Photonics (CREOL), University of Central Florida, Orlando, FL, USA
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  • Christopher J. Collison

    1. Nanopower Research Laboratories, Golisano Institute for Sustainability, Rochester Institute of Technology, Rochester, NY, USA
    2. Department of Chemistry, Rochester Institute of Technology, Rochester, NY, USA
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ABSTRACT

A squaraine dye is tested for novel application in a near-infrared-active organic photovoltaic cell that is subsequently optimized to obtain a power conversion efficiency of 2.4 ± 0.3%. The optimization utilizes an Alq3 buffer layer and macroscopic structure control through the addition of co-solvents in the spin-casting process. Co-solvent addition increases the amount of aggregates present as measured through linear absorption spectroscopy, and there is a concurrent increase in both efficiency and short-circuit current. An interpretation of the greatly increased current density is presented that describes how increased J-aggregation likely increases hole mobility and, as a result, charge separation of the photogenerated excited state. Copyright © 2012 John Wiley & Sons, Ltd.

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