Aitola, KerttuDomanski, KonradCorrea-Baena, Juan-PabloSveinbjornsson, KariSaliba, MichaelAbate, AntonioGraetzel, MichaelKauppinen, EskoJohansson, Erik M. J.Tress, WolfgangHagfeldt, AndersBoschloo, Gerrit2017-05-302017-05-302017-05-30201710.1002/adma.201606398https://infoscience.epfl.ch/handle/20.500.14299/137888WOS:000400344800016Mixed ion perovskite solar cells (PSC) are manufactured with a metal-free hole contact based on press-transferred single-walled carbon nanotube (SWCNT) film infiltrated with 2,2,7,-7-tetrakis(N, N-di-p-methoxyphenylamine)-9,90-spirobifluorene (Spiro-OMeTAD). By means of maximum power point tracking, their stabilities are compared with those of standard PSCs employing spin-coated Spiro-OMeTAD and a thermally evaporated Au back contact, under full 1 sun illumination, at 60 degrees C, and in a N-2 atmosphere. During the 140 h experiment, the solar cells with the Au electrode experience a dramatic, irreversible efficiency loss, rendering them effectively nonoperational, whereas the SWCNT-contacted devices show only a small linear efficiency loss with an extrapolated lifetime of 580 h.text::journal::journal article::research article