Modelling of two- and four-terminal thin-film silicon tandem solar cells

S Reynolds, V Smirnov

    Research output: Contribution to journalArticle

    6 Citations (Scopus)

    Abstract

    We have performed semi-empirical modelling of amorphous silicon/microcrystalline silicon thin-film solar cells in tandem optical configuration, under series (two-terminal) and independent (four-terminal) electrical connection. The four-terminal connection relaxes the constraint of current matching between the cells. Computer simulations indicate an increase in maximum initial efficiency from 10.0% (two-terminal) to 10.8% (four-terminal). Following degradation of the amorphous silicon top-cell the figures are 8.5% and 9.8% respectively, with an optimum top-cell absorber layer thickness in four-terminal connection of 150 nm. Changes in solar spectral quality have been simulated by applying weighted spectra, and improvements
    in efficiency favouring four-terminal connection occur under red- and blue-rich conditions. However, these typically convey only a small fraction of the total annual insolation, and gains of 5% or less in annual electrical output are predicted. Possible increased optical and electrical losses due to additional contact layers in four-terminal connection are not taken into account.
    Original languageEnglish
    Article number012006
    Number of pages9
    JournalJournal of Physics: Conference Series
    Volume398
    Issue numberConference 1
    DOIs
    Publication statusPublished - 2012
    Event17th International school on condensed matter physics:open problems in condensed matter physics, biomedical physics and their applications - Varna, Bulgaria
    Duration: 2 Sep 20127 Sep 2012

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    solar cells
    amorphous silicon
    silicon
    thin films
    cells
    insolation
    absorbers
    computerized simulation
    degradation
    output
    configurations

    Cite this

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    abstract = "We have performed semi-empirical modelling of amorphous silicon/microcrystalline silicon thin-film solar cells in tandem optical configuration, under series (two-terminal) and independent (four-terminal) electrical connection. The four-terminal connection relaxes the constraint of current matching between the cells. Computer simulations indicate an increase in maximum initial efficiency from 10.0{\%} (two-terminal) to 10.8{\%} (four-terminal). Following degradation of the amorphous silicon top-cell the figures are 8.5{\%} and 9.8{\%} respectively, with an optimum top-cell absorber layer thickness in four-terminal connection of 150 nm. Changes in solar spectral quality have been simulated by applying weighted spectra, and improvementsin efficiency favouring four-terminal connection occur under red- and blue-rich conditions. However, these typically convey only a small fraction of the total annual insolation, and gains of 5{\%} or less in annual electrical output are predicted. Possible increased optical and electrical losses due to additional contact layers in four-terminal connection are not taken into account.",
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    language = "English",
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    Modelling of two- and four-terminal thin-film silicon tandem solar cells. / Reynolds, S; Smirnov, V.

    In: Journal of Physics: Conference Series, Vol. 398, No. Conference 1, 012006, 2012.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - Modelling of two- and four-terminal thin-film silicon tandem solar cells

    AU - Reynolds, S

    AU - Smirnov, V

    PY - 2012

    Y1 - 2012

    N2 - We have performed semi-empirical modelling of amorphous silicon/microcrystalline silicon thin-film solar cells in tandem optical configuration, under series (two-terminal) and independent (four-terminal) electrical connection. The four-terminal connection relaxes the constraint of current matching between the cells. Computer simulations indicate an increase in maximum initial efficiency from 10.0% (two-terminal) to 10.8% (four-terminal). Following degradation of the amorphous silicon top-cell the figures are 8.5% and 9.8% respectively, with an optimum top-cell absorber layer thickness in four-terminal connection of 150 nm. Changes in solar spectral quality have been simulated by applying weighted spectra, and improvementsin efficiency favouring four-terminal connection occur under red- and blue-rich conditions. However, these typically convey only a small fraction of the total annual insolation, and gains of 5% or less in annual electrical output are predicted. Possible increased optical and electrical losses due to additional contact layers in four-terminal connection are not taken into account.

    AB - We have performed semi-empirical modelling of amorphous silicon/microcrystalline silicon thin-film solar cells in tandem optical configuration, under series (two-terminal) and independent (four-terminal) electrical connection. The four-terminal connection relaxes the constraint of current matching between the cells. Computer simulations indicate an increase in maximum initial efficiency from 10.0% (two-terminal) to 10.8% (four-terminal). Following degradation of the amorphous silicon top-cell the figures are 8.5% and 9.8% respectively, with an optimum top-cell absorber layer thickness in four-terminal connection of 150 nm. Changes in solar spectral quality have been simulated by applying weighted spectra, and improvementsin efficiency favouring four-terminal connection occur under red- and blue-rich conditions. However, these typically convey only a small fraction of the total annual insolation, and gains of 5% or less in annual electrical output are predicted. Possible increased optical and electrical losses due to additional contact layers in four-terminal connection are not taken into account.

    U2 - 10.1088/1742-6596/398/1/012006

    DO - 10.1088/1742-6596/398/1/012006

    M3 - Article

    VL - 398

    JO - Journal of Physics: Conference Series

    JF - Journal of Physics: Conference Series

    SN - 1742-6588

    IS - Conference 1

    M1 - 012006

    ER -