This isn't a link to a solar company but I found it to be an interesting article that I wanted to share. Apparantly, the Idaho National Laboratory is working on developing solar cells that are up to 80% efficient and can even generate energy (albeit less of course) at night. The original article can be found here:
http://www.nanotech-now.com/news.cgi?story_id=27235
Anyone heard of this before or can speculate on how soon we'll see this technology on the commercial market? Just think how much more energy can be harvested on a smaller surface area. If they can mass produce this technology and integrate it in products such as electric cars, it would be amazing.