Diagnosis and design optimization of sub-cells in multi-junction solar cells on the basis of absolute luminescence quantum-yield study

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  • AKIYAMA Hidefumi
    Institute for Solid State Physics, University of Tokyo Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Agency (JST) Development of Advanced Measurement and Analysis System (JST-SENTAN), Japan Science and Technology Agency (JST)

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Other Title
  • 多接合太陽電池の診断・設計と発光絶対値・発光量子効率の評価
  • タセツゴウ タイヨウ デンチ ノ シンダン ・ セッケイ ト ハッコウ ゼッタイチ ・ ハツ コウリョウシ コウリツ ノ ヒョウカ

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Abstract

<p>We present a method for accessing the balance sheets of energy and carriers as well as the respective sub-cell photovoltaic properties and internal luminescence yields in multi-junction solar cells by measuring the absolute electroluminescence quantum yields. This method was applied to a InGaP/GaAs/Ge 3-junction solar cell for satellite use. We calculated the conversion-efficiency limit and the optimized bandgap energy in 2-, 3-, and 4-junction tandem solar cells including finite values of sub-cell internal luminescence quantum yields to account for realistic material qualities in sub-cells. The results provide realistic targets for efficiency limits and improved design principles for practical tandem solar cells.</p>

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  • Oyo Buturi

    Oyo Buturi 84 (4), 319-325, 2015-04-10

    The Japan Society of Applied Physics

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