While it's exciting to see these motivated and dedicated young kids, it's quite obvious that they had to use silicon (semiconductor) nonetheless. Fact-check: silicon cell array is used in the conventional/commercial solar panel. These folks used silicon-coated hair. It's not HAIR which is producing the electricity but it's merely acting as an absorber of sunlight since it's black.

I would be interested in this project, if these experimenters could light a bulb without using silicon coating OR generate the same amount of voltage with a "budhako seto kapaal" http://sajha.com/sajha/chat/smileys/m-tongue.gif