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Energy has been playing an important role for civilization. In the early ages, wood was the main source of energy. Industrialization and modernization which started around two hundred years ago were mainly based on fossil fuels and even now they are being used on a large scale. Huge demand of such energies has caused environmental problems and rises in coal and oil prices as well. With ever expanding cities consuming more and more energy, the fuel reserves for example oil, gas, coal, etc., throughout the world may not be able to match the demand. There is a drive towards biofuels but unless the world’s food energy needs are addressed, the viability of such fuels will remain a mirage for many decades. This therefore calls for alternative sources of energy such as those employing wind, photovoltaic, biomass, geothermal and wave power technology. The sun alone is continually releasing an enormous amount of radiant energy into the solar system. The Earth receives a tiny fraction of this energy; yet, an average of 1367 watts reaches each square meter of the outer edge of the Earth's atmosphere. The atmosphere absorbs and reflects some of this radiation, including most X-rays and ultraviolet rays but still, the amount of solar energy received by the surface of the earth per minute is greater than the energy utilization by the entire population in one year (Sen, 2004).

Contribution of Spectrally Selective Reflector Surface to Heat Reduction in Silicon Concentrator Solar Cells