Microsystem-enabled Photovoltaics
The key enabling technology for this approach to PV is the ability to create, through microsystems technology, very small solar cells made from high-quality crystalline silicon or gallium arsenide semiconductor materials. The cells are so small that, when released from their wafers, they take on the appearance of glitter. The cells are approximately 20 microns thick, 500 microns across, and composed of crystalline silicon. Efficiencies of nearly 15% have been demonstrated, exceeding 20% for single junction cells. Crystalline silicon and gallium arsenide make very good solar cells due to the high quality and performance of the material and semiconductor bandgap characteristics that are well matched to the solar spectrum.