Diffusion-emission theory of photon enhanced thermionic emission solar energy harvesters
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- Aapo Varpula
- VTT Technical Research Centre of Finland , P.O. Box 1000, FI-02044 VTT Espoo, Finland
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- Mika Prunnila
- VTT Technical Research Centre of Finland , P.O. Box 1000, FI-02044 VTT Espoo, Finland
説明
<jats:p>Numerical and semi-analytical models are presented for photon-enhanced-thermionic-emission (PETE) devices. The models take diffusion of electrons, inhomogeneous photogeneration, and bulk and surface recombination into account. The efficiencies of PETE devices with silicon cathodes are calculated. Our model predicts significantly different electron affinity and temperature dependence for the device than the earlier model based on a rate-equation description of the cathode. We show that surface recombination can reduce the efficiency below 10% at the cathode temperature of 800 K and the concentration of 1000 suns, but operating the device at high injection levels can increase the efficiency to 15%.</jats:p>
収録刊行物
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- Journal of Applied Physics
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Journal of Applied Physics 112 (4), 2012-08-15
AIP Publishing
