Liu, Z., B. Sun, X. Liu, J. Han, H. Ye, T. Shi, Z. Tang, and G. Liao. “Efficient Carbon-Based CsPbBr3 Inorganic Perovskite Solar Cells by Using Cu-Phthalocyanine As Hole Transport Material”. Nano-Micro Letters, vol. 10, no. 2, Jan. 2018, p. 34, doi:10.1007/s40820-018-0187-3.