Zeng Fan-Ju, Tan Yong-Qian, Tang Xiao-Sheng, Zhang Xiao-Mei, Yin Hai-Feng. Progress of lead-free perovskite and its resistance switching performanceJ. Acta Physica Sinica, 2021, 70(15): 157301. DOI: 10.7498/aps.70.20210065