High Members of the 2D Ruddlesden-Popper Halide Perovskites: Synthesis, Optical Properties, and Solar Cells of (CH₃(CH₂)₃NH₃)₂(CH₃NH₃)₄Pb₅I₁₆

Constantinos C. Stoumpos, Chan Myae Myae Soe, Hsinhan Tsai, Wanyi Nie, Jean Christophe Blancon, Duyen H. Cao, Fangze Liu, Boubacar Traoré, Claudine Katan, Jacky Even, Aditya D. Mohite, Mercouri G. Kanatzidis^*