1880 selenium photovoltaic cells were built to convert light from a visible spectrum into electricity and were 1-2% efficient.
1950 Czochralski meter has been developed for the production of highly pure crystalline silicon.
1954 Bell mobile laboratory produced a silicon photovoltaic cell efficiency of 4% and later reached an efficiency of 11%.
Spatius 1958 U.S. Vanguard space satellite used a small (less than 1 watt ) array to power a radio. Space program has played an important role in the development of PV at that time.
1973-1974 During the oil embargo of the U.S. Department of Energy funded the federal program photovoltaic, resulting in over 3100 test installation of photovoltaic systems, some of which are in operation today.
1970-1990 Solar energy has been a total lack of interest in solar energy production, the majority shareholders of USA PV interests were transferred to Germany and Japan.
Classification
Solar cells can be classified according to several criteria. The criterion is used by the material thickness. Here distinguish cells thick and thin cells.
Another criterion is the kind of material: It is used, for example, combinations of semiconductor CdTe, GaAs or CUIN, but most commonly used is silicon.
After basic structure distinguish crystalline materials (mono-/policristaline) or amorphous.
In addition fotovaltaice cell manufacturing semiconductor newer and there is the possibility of using organic materials or organic pigments
Factors that need to keep in mind before purchasing a photovoltaic panel.
Geographical area where the solar panel is to be installed and building orientation,
Optimum tilt / shade – ideal sensors must not be shaded at least 6 hours per day.
5 reasons why you can become an Add-Energy Renewable Romania PARTNER
To register your Company as ADD ENERGY PARTNER , please access 
For other informations click to 