A green solvent enables precursor phase engineering of stable formamidinium lead triiodide perovskite solar cells

Benjamin M. Gallant, Philippe Holzhey, Joel A. Smith, Saqlain Choudhary, Karim A. Elmestekawy, Pietro Caprioglio, Igal Levine, Alexandra A. Sheader, Esther Y.H. Hung, Fengning Yang, Daniel Toolan, Rachel C. Kilbride, Karl Augustin Zaininger, James M. Ball, M. Greyson Christoforo, Nakita K. Noel, Laura M Herz, Dominik J. Kubicki, Henry J Snaith^*