Solar energy could become more affordable following a technological breakthrough. Scientists at Australia's University of New South Wales have boosted the efficiency of solar cell technology, potentially dropping the price of an installed solar system for an average house from around $16,500 to $12,000. (Tax breaks and other incentives would reduce it further.) Currently, up to 45 percent of the cost of solar cell technology is due to the high cost of the silicon used to convert sunlight to electricity.
Now, researchers at UNSW's ARC Photovoltaics Centre of Excellence, led by PhD student Supriya Pillai report a 16-fold enhancement in light absorption in 1.25-micron thin-film cells for light with a wavelength of 1050 nm. They also report a seven-fold enhancement in light absorption in the more expensive wafer type cells light wavelengths of 1200 nm. The breakthrough is reported in the upcoming issue of the Journal of Applied Physics.