Sol Voltaics has raised $9.4 million from the Umoe and others to make solar cells more efficient, the company announced today. The Lund, Sweden-based startup is using nanotechnology to build solar cell modules that are up to 25 percent more efficient than the cells currently on the market. If the company can deliver its SolInk material as advertised, then it could make solar a more affordable option for a broader set of customers, as reported by VentureBeat. Read more