This is one powerful idea that would do away with massive solar panels. Solar cells could soon be spray painted onto the sides of buildings or rooftops with nanoparticles.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/harvest-sun-spray-solar-cells
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/times-india-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-resources
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/wastewater-recycling
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/renewable-energy
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/solar-energy
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/energy
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/electricity
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/solar-cells