Have you seen those big, bulky, breakable photovoltaic cells that now collect the sun’s rays? Well, what if solar energy could be harnessed using tiny collectors that could be spray painted on a roof, a wall or even a window
I have heard of a solar film that can be applied to windows. But as a paint, a person would be able to make their whole house a solar generating plant. You still would need an electrician to connect your house. I think we are at the tip of the ice burg with what nanotechnology will be able to do.