Near infrared up-conversion in organic photovoltaic devices using an efficient Yb 3+: Ho 3+ Co-doped Ln 2BaZnO 5 (Ln Y, Gd) phosphor

A. A Damitha Adikaari, Isabelle Etchart, Paul Henri Guéring, Mathieu Bérard, S. Ravi P Silva, Anthony K. Cheetham, Richard J. Curry

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    Abstract

    The first detailed study that combines the use of a new generation of high-efficiency Yb 3+:Ho 3+ co-doped Y 2BaZnO 5 near-infrared up-converting phosphors with organic photovoltaic devices is reported. We show that it is possible to obtain a J sc of 16 μA cm -2 under 986 nm illumination (∼390 mW cm -2 corresponding to ∼37 suns) leading to an up-conversion external quantum efficiency (η EQE UC) of 0.0052. Through modification of the organic photovoltaic devices to incorporate transparent electrodes we show that η EQE UC could be increased to 0.031 , matching that achieved in amorphous-Si:H PV cells. Accounting for the full spectral range that may be absorbed by the phosphor (∼870-1030 nm) yields an up-conversion power conversion efficiency (η PCE UC) of 0.073 which again could be improved to 0.45% using transparent electrodes. This technique for utilizing the near-infrared spectral region may therefore offer a potential route to improving the performance of organic photovoltaic devices as research into discovering high-efficiency up-converting phosphors continues to provide improved materials.

    Original languageEnglish
    Article number094502
    JournalJournal of Applied Physics
    Volume111
    Issue number9
    DOIs
    Publication statusPublished - 1 May 2012

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