||Nowadays, a particular interest in the development of alternative energy sources arose, especially motivated by the need of reducing the dependency on fossil fuel resources and for providing the reduction of CO2 emissions. An attractive strategy to overcome the present energy problem is using renewable energy sources, such as the direct solar radiation, for producing clean energy. In this sense, the direct conversion of sunlight into electric power by means of photovoltaic systems makes an important contribution to this energy contend in an environmentally friendly way.
In the last decade, solar and photovoltaic (PV) technologies have emerged as a potentially major technology for power generation in the world. Despite the economic crisis, the PV market has continued to grow almost 15 % in 2009 compared to 2008 and the total power installed in the world raised by 45 % and up to 22.9 GW. However, so far, the photovoltaic field has been dominated by devices in which the junction consists of inorganic solid-state materials, usually silicon, profiting from the expertise of the semiconductor industry. In fact, over 85 % of the current production is based on silicon wafer or silicon ribbon technology. A major advantage of this technology is that complete production lines can be bought, installed and being producing within a relatively short time-frame. This predictable production start-up scenario constitutes a low-risk placement with calculable return on investments. Even though these technologies are still very expensive and only survive in very specific groups of the market or with financial supports. Presently, the photovoltaic panels price has been decreased significantly, reaching at the moment 3.5 ¤/W. Nevertheless, these values are still not competitive to the individual consumer and this is, in fact, the major problem limiting the mass production of this type of technologies for domestic purposes - microgeneration. Thus, incentives to incorporate PV technologi