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Modelling the Confined States in Multi Quantum Well Solar Cells

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10 Author(s)
M. C. Lynch ; Experimental Solid State Physics, Blackett Laboratory, Imperial College London, SW7 2BW, U.K. ; I. M. Ballard ; A. Bessiere ; C. Calder
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The strain balanced quantum well solar cell (SB-QWSC) provides a novel method of engineering the bandgap of a p-i-n junction to better match the terrestrial solar spectrum. The ability to accurately model the spectral response of a SB-QWSC is vital in optimising cell design. We present a study into two major components of such a model. Firstly, we provide an overview of the model for the confined energy levels within SB-QWSCs and outline the method used to determine a vital parameter for such calculations; the conduction band offset. Secondly, a critical evaluation of the hole in-plane effective masses (required to model the device absorption) is given. A multi-band k.p model is used to calculate the in-plane valence band dispersion and values for the effective masses are extracted from fits to the resulting E-k curves. The results of these investigations are then used to model the spectral response of a typical SB-QWSC. Good agreement is observed between absolute prediction and measured quantum efficiencies

Published in:

2006 IEEE 4th World Conference on Photovoltaic Energy Conference  (Volume:1 )

Date of Conference:

7-12 May 2006