CIGS stands for copper indium gallium (di)selenide, a compound that is used as a semiconductor material in thin film solar cells.
CIGS solar cells are generally not as efficient as crystalline silicon solar cells in converting light into electricity, but advocates of the approach predict that they will prove much cheaper to produce commercially.
CIGs cells also tend to be thinner and lighter than their silicon counterparts, making them suitable for use in building-integrated solar systems.
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