Roldan-Carmona, C.Gratia, P.Zimmermann, I.Grancini, G.Gao, P.Graetzel, MichaelNazeeruddin, Mohammad Khaja2016-02-162016-02-162016-02-16201510.1039/c5ee02555ahttps://infoscience.epfl.ch/handle/20.500.14299/123679WOS:000365412300011Methylammonium lead iodide perovskite solar cells with improved performance and stability have been successfully prepared by using a non-stoichiometric PbI2 : CH3NH3I ratio in the precursor solution, and yield a power conversion efficiency (PCE) of above 19% under 1 sun for the champion cell.text::journal::journal article::research article