First-principles study of R3c-MgSnX3 (X[dbnd]O, S and Se) for photovoltaic and ferroelectric application. - Chen, Xing-Yuan; Tan, Jia-Qi; Su, Kun-Ren; Yang, Jun-Hua; Xu, Xiang-Fu; Luo, Guo-Ping; Zhu, Wei-Ling; Hu, Su-Mei; Lai, Guo-Xia; Ji, Hong; Niu, Li-Ting (Physics Letters A, 2022)