Interesting: CdTe has a bandgap of 1.5eV, closer to the ideal for solar efficiency than Si, which has a bandgap of 1.1eV. Multijunction cells can achieve effici

Interesting: CdTe has a bandgap of 1.5eV, closer to the ideal for solar efficiency than Si, which has a bandgap of 1.1eV. Multijunction cells can achieve efficiencies of over 80% since each junction can address a different part of the solar spectrum. However, they're not cost-effective yet.