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

    Authors

    S. Spencer; H. Hu; Q. M. Li; H. Y. Ahn; M. Qaddoura; S. Yao; A. Ioannidis; K. Belfield;C. J. Collison

    Comments

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    Abbreviated Journal Title

    Prog. Photovoltaics

    Keywords

    aggregates; squaraines; organic photovoltaic cells; POLYMER SOLAR-CELLS; DYES; BLENDS; LAYERS; Energy & Fuels; Materials Science, Multidisciplinary; Physics, Applied

    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 (c) 2012 John Wiley & Sons, Ltd.

    Journal Title

    Progress in Photovoltaics

    Volume

    22

    Issue/Number

    4

    Publication Date

    1-1-2014

    Document Type

    Article

    Language

    English

    First Page

    488

    Last Page

    493

    WOS Identifier

    WOS:000332987900010

    ISSN

    1062-7995

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