Revealing the role of Pb2+ in the stability of organic-inorganic hybrid perovskite CH3NH3Pb1-xCdxI3: an experimental and theoretical study - Navas, Javier; Sanchez-Coronilla, Antonio; Jesus Gallardo, Juan; Martin, Elisa I.; Hernandez, Norge C.; Alcantara, Rodrigo; Fernandez-Lorenzo, Concha; Martin-Calleja, Joaquin (PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 2015)