Photovoltaic panels are made up with polycristalline or monocrystalline silicon photovoltaic cells.

The difference between them is on the manufacturing procedure. The monocrystalline silicon cells are obtained from very pure silicon which is recast in a crucible together with a very small portion of borex. Once the material is liquefied, a rod with a silicon “crystal germ” is introduced. It is then re-grown with new atoms that come from the liquid and that remain in order following the structure of the crystal. This way, a doped monocrystal is obtained which is later cut into wafers of a thickness of approximately 3 tenths of millimetre. These wafers are then introduced in special furnaces in which phosphorous atoms are disseminated and then deposited on one side and reach a certain depth on the surface. Then, and prior to carrying out the serigraphy for the superficial interlinks, they are covered with a non-reflecting titanum or zirconium bioxid.

On the polycrystalline cells, instead of beginning with one monocrystal, the silicon paste is left to solidify in a mould and then, a solid made up by many silicon crystals is obtained, it can be later cut in thin polycristalline wafers.