<title>Fabrication and test of a holographic concentrator for two-color PV operation</title>

Abstract

The dispersion of the solar radiation into different spectral bands which are focused onto spectrally matched solar cells improves the electric efficiency of photovoltaic collectors in comparison with conventional systems. Holographic lenses are able to disperse and to focus solar radiation at the same time. They may be reproduced from a master and are suitable for cheap mass production. The paper presents the fabrication and test of a 50 X 50 cm<SUP>2</SUP> PV-concentrator composed of a stack of two holographic lens arrays. Each lens array consists of 49 single lenses of dimension 7 X 7 cm<SUP>2</SUP>. One array operates in the long wave spectral band, the other in the short wave range. The solar radiation is focused on spectrally matched solar cells of size 1 X 1 cm<SUP>2</SUP>.