He, J., E. Bi, W. Tang, Y. Wang, X. Yang, H. Chen, and L. Han. “Low-Temperature Soft-Cover-Assisted Hydrolysis Deposition of Large-Scale TiO2 Layer for Efficient Perovskite Solar Modules”. Nano-Micro Letters, vol. 10, no. 3, Apr. 2018, p. 49, doi:10.1007/s40820-018-0203-7.