Also have a look at http://www.nature.com/articles/srep18721 http://www.nature.com/articles/srep18721. It raises the question if it is a good idea to have solar

Also have a look at http://www.nature.com/articles/srep18721 http://www.nature.com/articles/srep18721. It raises the question if it is a good idea to have solar cells which partly consist of lead (Pb).