Equivalent-circuit and transport-based mobility models of microcrystalline silicon solar cells

Steve Reynolds (Lead / Corresponding author), Aad Gordijn, Vladimir Smirnov

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    2 Citations (Scopus)
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    Microcrystalline silicon thin film solar cells exhibit optimal PV efficiency when the absorber layer contains similar proportions of crystalline and amorphous phases. When the crystalline fraction is reduced below 30%, efficiency falls very steeply, from around 8% to as low as 2%, and does not recover until fully amorphous growth conditions are established. We demonstrate that an electrical model, comprising two parallel-connected diodes scaled to reflect material composition, qualitatively predicts the features observed in the PV parameters. However the scale of the reduction in fill-factor is not reproduced. As an alternative approach, a homogeneous transport model is proposed in which carrier mobilities are scaled in accordance with values determined by the time-of-flight experiment. This model predicts a large reduction in fill-factor for low-crystallinity absorbers more in keeping with measurement. A novel carrier transport landscape is proposed to account for mobility variations.
    Original languageEnglish
    Pages (from-to)192-202
    Number of pages11
    JournalEnergy Procedia
    Publication statusPublished - 2014
    EventE-MRS Spring Meeting 2013: Symposium D Advanced Inorganic Materials and Structures for Photovoltaics - Congress Center, Strasbourg, France
    Duration: 27 May 201331 May 2013


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