In this Letter, we demonstrate a planar n-i-p perovskite solar cell design with a steady-state efficiency of up to 18.8% in the absence of any electronic dopants. In the device stack, solution-processed SnO2 is used as an electron-accepting n-type layer. The absorber layer is a perovskite with both mixed organic A-site cations and mixed halides (FA(0.83)MA(0.17)Pb(I0.83Br0.17)(3)). The hole-transporting p-type layer is a double-layer structure of polymer-wrapped single-walled carbon nanotubes and undoped spiro-OMeTAD. We show that this approach can deliver steady-state efficiencies as high as and even higher than those of traditionally doped spiro-OMeTAD, providing a pathway for dopant-free perovskite solar cells crucial for long-term stability. [GRAPHICS]
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Abate A, 2013, PHYS CHEM CHEM PHYS, V15, P2572, DOI [10.1039/c2cp44397J, 10.1039/c2cp44397j]
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Abengoa, Abengoa Res, C Energia Solar 1,Campus Palmas Altas, Seville 41014, SpainAbengoa, Abengoa Res, C Energia Solar 1,Campus Palmas Altas, Seville 41014, Spain
Calio, Laura
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Kazim, Samrana
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Abengoa, Abengoa Res, C Energia Solar 1,Campus Palmas Altas, Seville 41014, SpainAbengoa, Abengoa Res, C Energia Solar 1,Campus Palmas Altas, Seville 41014, Spain
Kazim, Samrana
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Graetzel, Michael
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Swiss Fed Inst Technol, Dept Chem & Chem Engn, Lab Photon & Interfaces, Stn 6, CH-1015 Lausanne, SwitzerlandAbengoa, Abengoa Res, C Energia Solar 1,Campus Palmas Altas, Seville 41014, Spain
Graetzel, Michael
;
Ahmad, Shahzada
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Abengoa, Abengoa Res, C Energia Solar 1,Campus Palmas Altas, Seville 41014, SpainAbengoa, Abengoa Res, C Energia Solar 1,Campus Palmas Altas, Seville 41014, Spain
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Abengoa, Abengoa Res, C Energia Solar 1,Campus Palmas Altas, Seville 41014, SpainAbengoa, Abengoa Res, C Energia Solar 1,Campus Palmas Altas, Seville 41014, Spain
Calio, Laura
;
Kazim, Samrana
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Abengoa, Abengoa Res, C Energia Solar 1,Campus Palmas Altas, Seville 41014, SpainAbengoa, Abengoa Res, C Energia Solar 1,Campus Palmas Altas, Seville 41014, Spain
Kazim, Samrana
;
Graetzel, Michael
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Swiss Fed Inst Technol, Dept Chem & Chem Engn, Lab Photon & Interfaces, Stn 6, CH-1015 Lausanne, SwitzerlandAbengoa, Abengoa Res, C Energia Solar 1,Campus Palmas Altas, Seville 41014, Spain
Graetzel, Michael
;
Ahmad, Shahzada
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Abengoa, Abengoa Res, C Energia Solar 1,Campus Palmas Altas, Seville 41014, SpainAbengoa, Abengoa Res, C Energia Solar 1,Campus Palmas Altas, Seville 41014, Spain