If you have considered all the scientific discoveries that had happened over the last century, then you would surely appreciate the translation of solar energy to electrical energy through photovoltaic cells. To be frank, it is the most realistic and electrifying breakthrough in the tapping of solar energy.
There are two types of crystalline solar cells: polycrystalline and monocrystalline. Crystalline solar cells are produced mainly by the Siemens process, the Czochralskie process, and ribbon process.
In the Siemens process, trichlorosilane, or silane is fed along with hydrogen into a chamber in which slender rods of electronic grade silicon are heated to over 1000°C. This process produces a polycrystalline ingot.
In the Czochralskie process, silicon chunks are heated to over 1000°C thereby seed crystal melts out when rotated. The silicon solidifies and forms a single crystal growth. This produces a monocrystalline ingot.
Another method is the ribbon forming process in which strings are pulled through a container of molten silicon. The molten silicon solidifies between the strings and forms a continuous ribbon.
In each process, after the crystal is formed, it must be cut into wafers. Thus, it is made to cut as per the size and then polished enough to make PN junction. Then, the front electrodes and back contacts are applied. Finally, an anti-reflective coating is applied.
Polycrystalline and monocrystalline solar cells are used for building solar panels because they are easy to work with, are most readily available in the secondary market, and provide a good power output that is cost effective.
By reading the above info, don’t be of the impression that building solar panels is a technical issue. For more information and step by step instructions on how to build solar panels, visit the exclusive resource – Earth4Energy.