Manufacturing technique and return on energy investment (source Wikipedia )
Silicon is currently the most widely used material for making solar cells at an industrial level. sand Various treatments for purifying silicon which is then heated and reduced in an oven. The product obtained is a silicon metallurgical said, pure 98% only. This silicon is then purified and chemically leads to electronic grade silicon which is in liquid form. Subsequently, this pure silicon will be enriched by doping elements (P, As, Sb or B) during the doping step, to transform the semiconductor type P or N.
The production of photovoltaic cells requires energy, and it is estimated that a photovoltaic cell must operate at approximately 2 3 years of its technology to produce energy that was necessary for its production (energetic return of the module)