Aitola, KerttuSveinbjornsson, KariCorrea-Baena, Juan-PabloKaskela, AnttiAbate, AntonioTian, YingJohansson, Erik M. J.Graetzel, MichaelKauppinen, Esko I.Hagfeldt, AndersBoschloo, Gerrit2016-04-012016-04-012016-04-01201610.1039/c5ee03394bhttps://infoscience.epfl.ch/handle/20.500.14299/125471WOS:000369744500010We demonstrate a high efficiency perovskite solar cell with a hybrid hole-transporting material-counter electrode based on a thin single-walled carbon nanotube (SWCNT) film and a drop-cast 2,2,7,-7-tetrakis(N, N-di-p-methoxyphenylamine)-9,90-spirobifluorene (Spiro-OMeTAD) hole-transporting material (HTM). The average efficiency of the solar cells was 13.6%, with the record cell yielding 15.5% efficiency. The efficiency of the reference solar cells with spin-coated Spiro-OMeTAD hole-transportingmaterials (HTMs) and an evaporated gold counter electrode was 17.7% (record 18.8%), that of the cells with only a SWCNT counter electrode (CE) without additional HTM was 9.1% (record 11%) and that of the cells with gold deposited directly on the perovskite layer was 5% (record 6.3%). Our results show that it is possible to manufacture high efficiency perovskite solar cells with thin film (thickness less than 1 mu m) completely carbon-based HTMCEs using industrially upscalable manufacturing methods, such as press-transferred CEs and drop-cast HTMs.text::journal::journal article::research article