What is the difference between the multijunction solar cells used in your CPV system and solar cells used in traditional PV systems?

The multijunction solar cells used in Amonix CPV systems work by layering semiconductor materials that have different bandgaps. Sunlight enters the layer that has the largest bandgap and continues to penetrate the solar cell until it reaches the layer that has a smaller bandgap than its photon’s energy. 
In this way, multijunction solar cells are more efficient than single layer solar cells because less of the photon’s energy is lost to heat when it exceeds the bandgap of the absorbing semiconductor material.

Used in conjunction with concentrator optics such as Fresnel lenses, multijunction solar cells are capable of converting sunlight into electricity exceeding 40% efficiency. This efficiency rises as the level of concentration increases, but decreases as temperature increases; the Amonix CPV system is designed to keep the cell temperature as low as possible using passive air-cooling.
Unparalleled performance under operating conditions makes Amonix multijunction cell technology cost effective within a CPV system at 500x concentration. The high efficiency more than offsets the additional cost of cooling and 2-axis tracking that are required to maintain high concentration. 


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