[9] Kim H S, Lee C R, Im J H et al. Lead iodide perovskite sensitized all-solid-state submicron thin film mesoscopic solar cell with efficiency exceeding 9%[J]. Scientific Reports, 2, 591(2012).
[18] Hawash Z, Ono L K, Qi Y B. Photovoltaics: moisture and oxygen enhance conductivity of LiTFSI-doped spiro-MeOTAD hole transport layer in perovskite solar cells[J]. Advanced Materials Interfaces, 3, 1600117(2016).