Corrigendum to "Preparing Cu2ZnSn(SxSe1−x)4 thin-film solar cells with front band gap grading by plasma sulfurization" [Sol. Energy 227 (2021) 516–524]. (1st March 2022) - Zhang, Daoyong; Sun, Shizhong; Li, Xinyu; Li, Xiang; Liu, Xin; Li, Qiulian; Liao, Hua; Wang, Shurong