Semiconductor Nanoparticles Make Printing Solar Cells Affordable
Solar cells are expensive in part because they are hard to make. Most of them are produced in vacuum chambers that use tons of energy to deposit thin layers of semiconductor materials onto a flawless wafer. Nanosolar churns them out at a fraction of the cost by printing nanoparticles on spools of cheap metal foil. The start-up company is currently building larger factories to ramp up production.