Sn⁴⁺ precursor enables 12.4% efficient kesterite solar cell from DMSO solution with open circuit voltage deficit below 0.30 V

Yuancai Gong, Yifan Zhang, Erin Jedlicka, Rajiv Giridharagopal, James A. Clark, Weibo Yan, Chuanyou Niu, Ruichan Qiu, Jingjing Jiang, Shaotang Yu, Sanping Wu, Hugh W. Hillhouse, David S. Ginger, Wei Huang, Hao Xin