Combined Precursor Engineering and Grain Anchoring Leading to MA-Free, Phase-Pure, and Stable α-Formamidinium Lead Iodide Perovskites for Efficient Solar Cells - Ling,X; Zhu,H; Xu,W; Liu,C; Pan,L; Ren,D; Yuan,J; Larson,BW; Gratzel,C; Kirmani,AR; Ouellette,O; Krishna,A; et al. (ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 2021)