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

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

    Research output: Contribution to journalArticle

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    Abstract

    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
    Volume44
    DOIs
    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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  • Research Output

    • 1 Citations
    • 1 Paper

    Comparison of transport-based and equivalent-circuit models of microcrystalline silicon solar cells

    Reynolds, S., Gordijn, A. & Smirnov, V., 2013.

    Research output: Contribution to conferencePaper

    Activities

    • 1 Participation in conference

    E-MRS Spring Meeting 2013: Symposium D Advanced Inorganic Materials and Structures for Photovoltaics

    Stephen Reynolds (Participant)

    27 May 2013

    Activity: Participating in or organising an event typesParticipation in conference

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