Abstract
The efficiency of solar energy conversion in a photovoltaic device consisting of an infinite number of solar cells is examined in detail. A mathematical analysis of the complicated functional dependence of the efficiency on temperature and light concentration ratio is presented. Although an infinite tandem seems, at first sight, only of academic interest, it is shown that the various approximate expressions obtained for the complicated efficiency function can give some more insight into the basic limits of the photovoltaic conversion, and can enable easy predictions of an upper limit of the efficiency of tandem structures with a finite number of solar cells.
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