Multi-junction solar cells are a high-efficiency alternative to traditional single-junction silicon cells. By using multiple layers of semiconductor materials, each tuned to a different part of the solar spectrum, these cells can achieve efficiencies far beyond the theoretical limit of single-junction cells.
Stacking the Spectrum
A typical multi-junction cell might have a top layer of Gallium Indium Phosphide to capture high-energy blue light, a middle layer of Gallium Arsenide for green light, and a bottom layer of Germanium for low-energy infrared light. This allows the cell to harvest energy from across the entire rainbow of sunlight.
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