The main limitation of solar power right now is cost, because the crystalline silicon used to make most solar photovoltaic (PV) cells is very expensive. One approach to overcoming this cost factor is to concentrate light from the sun using mirrors or lenses. But traditional light concentrators are bulky and unattractive. Now Prism Solar Technologies...has developed a proof-of-concept solar module that uses holograms to concentrate light, possibly cutting the cost of solar modules by as much as 75 percent, making them competitive with electricity generated from fossil fuels. The panels, says Rick Lewandowski, the company's president and CEO, are a "more elegant solution" to traditional concentrators, and can be installed on rooftops -- or even incorporated into windows and glass doors. A layer of holograms...directs light into a layer of glass where it continues to reflect off the inside surface of the glass until it finds its way to one of the strips of PV silicon. Reducing the PV material needed could bring down costs from about $4 per watt to $1.50 for crystalline silicon panels. The company is expecting to...start manufacturing its first-generation modules by the end of the year, selling them at about $2.40 per watt. CEO Lewandowski says the holographic modules will cost about $1.50 per watt in a few years, using their second-generation technology. At that price, they'll start to compete with fossil fuel-generated electricity, which now costs almost three times less than conventional solar electricity.

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