The effort to make solar cells more efficient has been only slightly easier than trying to milk blood from a stone.
While the average panel sold commercially these days does a significantly better job of converting sunlight into electricity than those of a few years ago, the best panels available to the public today aren’t all that much more efficient than those that were on the market in the middle of the last decade.
The people behind Tandem PV Inc. think the Santa Clara startup can give the…