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Varian Associates, Inc. has designed and fabricated a spectrum splitting, concentrating photovoltaic module that uses point focus curved facet Fresnel lenses to concentrate incident sunlight. The concentrated sunlight beam spectrum is split into a high and low energy part by a dichroic filter. The high energy part of the spectrum is transmitted to an AlGaAs solar cell and the low energy part is reflected to a Si cell. Spectrum splitting and using cells that respond best to the two parts of the spectrum gives a higher efficiency than the use of either cell alone. Varian has tested their experimental module, which consists of 10 AlGaAs and 10 Si cells, and has measured a sunlight to electricity conversion efficiency of 20 % .

Design and demonstration of a spectrum-splitting photovoltaic concentrator module