Butanol-assisted solvent annealing of CH3NH3PbI3 film for high-efficient perovskite solar cells. - Mou, Junpeng; Song, Jian; Che, Min; Liu, Yan; Qin, Yongshan; Liu, Heming; Zhu, Lei; Zhao, Yulong; Qiang, Yinghuai (Journal of Materials Science: Materials in Electronics, 2019)