Home Green Products Guide Would it possible to make roof tiles into solar panels?

Would it possible to make roof tiles into solar panels?

I was wondering if roof tiles were made of solar panel materials at a similar cost as an conventional roofing tile or slate, it would have been easier for government to meet its carbon footprint and cut green house gas. If one tile could make 0.5 volts then think how much power a house or street could make. Would it possible to make roof tiles into solar panels? I would really appreciate your views and opinions regarding this. Thanks.