“…[117b] In addition, it has superior properties of deep conduction and valence band, low temperature synthesis approaches, high transparency, and excellent stability. [119] In 2016, the first report about SnO 2 as ETL in Sb 2 S 3 -based solar cells was published by Lei et al [18b] They investigated SnO 2 and TiO 2 as ETLs in two devices with the same structure for [43] , CdS, [36] Spiro-OMeTAD, [22] V 2 O 5 , [107] P3HT, [108] PCPDTBT, CuSCN, [67] PAN, [109] CuI, [110] Carbon, [111] NiO x , [25b] graphene. [112] www.afm-journal.…”