Corrigendum to "Study on mechanical, electronic and optical properties of Pb-free double halide perovskites In2TiX6 (X = Cl, Br, I) for solar cells based on first-principles" [Mater. Today Commun. 26 (2021) 102180]. (June 2021) - Zhao, Xian-Hao; Tang, Yan-Lin; Tang, Tian-Yu; Diao, Xin-Feng; Gao, Li-Ke; Xie, Quan; Shi, Bin; Yuan, Li; Lu, Li-Min