Or, if you want the professor's technical explanation, "dye sensitised solar cells with titaniumoxide layers on a surface with light absorbing dye molecules adsorbed on surface which can generate electricity".
Dr Kamat and his team covered the surface of an experimental cell made of cadmium sulphide, zinc oxide and titanium dioxide with nanotubes, so that the tubes stuck up from the surface like hairs.
Inorganic or mineral-based UVA filters titanium dioxide and zinc oxide, which don't break down as easily in sunlight and generally are not allergenic, are better options, according to Lawrence Gibson, professor of dermatology at the Mayo clinic in Minnesota.