Low-Temperature Crystallization Enables 21.9% Efficient Single-Crystal MAPbI3 Inverted Perovskite Solar Cells - Alsalloum, Abdullah Y; Turedi, Bekir; Zheng, Xiaopeng; Mitra, Somak; Zhumekenov, Ayan A; Lee, Kwang Jae; Maity, Partha; Gereige, Issam; AlSaggaf, Ahmed; Roqan, Iman S; Mohammed, Omar F; Bakr, Osman M (ACS energy letters, 2020)