Solar cells stacked junction structure

Fig. 10.20. Typical structure of (a) single-junction and (b) stacked solar cells, with illumination through the glass substrate.

High efficiency solar cells are produced from crystalline binary or multinary compounds of elements from Groups III and V, almost entirely for space applications. While a wide range of materials and methods have been employed, the monolithic tandem stack of a Ga cIni (P cell, where x 0.516, above GaAs and Ge cells is a commercially produced, indicative example.Monolithic tandem structures present several challenges. The materials used in the various junctions should have similar thermal expansion coefficients and... 

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