As I've mentioned here before, a major barrier to costs falling in solar power these last few years, has been the rising cost of silicon. Not all solar companies however use silicon. Take DayStar, which yesterday traded up over 10%, closing at $14.21.

DayStar have developed a thin-film, copper-indium-gallium-selenide solar cell. Once you've got through saying all those words - CIGS for short - the important point is this; DayStar think they can make solar cells quite a bit cheaper than conventional silicon-based ones.

Definitely one to watch.