CPV Solar Systems - Why Use Less Photovoltaic Material?

[huzzi.123]

Homework Statement

Hey guys
Concentrated photovoltaic systems are known for high efficiency performance compared to that of a standard solar panel. But, what's confusing me is the reason behind using lesser photovoltaic material in CPV systems. Can't we use the solar panel of the same size as that in a non-concentrating solar panel?

Regards

 

[Vagn]

Homework Statement

Hey guys
Concentrated photovoltaic systems are known for high efficiency performance compared to that of a standard solar panel. But, what's confusing me is the reason behind using lesser photovoltaic material in CPV systems. Can't we use the solar panel of the same size as that in a non-concentrating solar panel?

Regards

The main reason is cost. The materials in the cells of CPV systems are usually epitaxial thin films containing rare-Earth elements (e.g. gallium and indium in CIGS) which are expensive to make, but more efficient than a silicon cell. By concentrating the sunlight, you can use a much smaller area than would otherwise be necessary for the same power output.