Si, GaAs, and InP as cathode materials for photon-enhanced thermionic emission solar cells

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    Abstract

    Photon-enhanced thermionic emission (PETE) solar cells are photovoltaic devices designed for high temperature operation. The use of Si, GaAs, and InP as the cathode (i.e. the absorber and electron-emitter electrode) materials in PETE solar cells is investigated with numerical device models. The models describe the cathode one dimensionally and are valid also at high injection levels. The temperature dependence of the photon absorption coefficients and temperature and doping dependencies of electron mobilities are modelled. Simulated device characteristics are presented and the factors determining the efficiency of the PETE devices are discussed. Our results show that Si, GaAs, and InP are all promising materials for PETE solar cells, if the surface recombination, effective electron affinities, and thermal stability of these materials can be optimized. Owing to their strong absorption, GaAs and InP show higher efficiencies (20-25%) than Si (10-15%) in spite of their intense radiative recombination. Especially, InP is a promising candidate for PETE cathodes as it shows higher efficiency than GaAs due to its stronger photon absorption properties.
    Original languageEnglish
    Pages (from-to)351-358
    JournalSolar Energy Materials and Solar Cells
    Volume134
    DOIs
    Publication statusPublished - 2015
    MoE publication typeA1 Journal article-refereed

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    Keywords

    • solar energy
    • photon-enhanced thermionic emission
    • device model
    • silicon
    • gallium arsenide
    • indium phosphide

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