Conventional photovoltaic panels require the very pure silicon, so costly, making the electricity produced little competitive.
The most promising alternative uses diselenide copper-indium-gallium (DSCIG) 350 times more effective than the silicon to the absorption of incident solar energy. However, despite twenty years of research no commercial panel could not be realized.
Vivian Alberts and his team (Rand Afrikaans University) have patented a method for manufacturing panels DSCIG a low cost (EUR 66 50 to a panel W with a lifetime of 15 has 20 years). 30 m2 a panel would produce the necessary electricity has a family 4 people and the energy needed to manufacture (gross energy content) would be recovered after a two years of operation. The manufacturing process requires two specially made instruments according to the specifications of Vivian Alberts: a disperser designed by Leybold Optics (Dresden) and a diffusion furnace (Wilro Technologies, The Netherlands).