\textgreater 1.0{\%} solar cell derived from carbon nanotube excitons

Semiconducting single-walled carbon nanotubes (s-SWCNTs) are promising photoabsorbers for photovoltaics due to their strong optical absorptivity, tunable NIR bandgaps, fast charge transport, and solution processability.~We have previously shown that electrons can be extracted from photogenerated excitons in s-SWCNTS by C$_{60}$ with internal quantum efficiency (QE) over 90{\%}. Here, we demonstrate s-SWCNT/C$_{60}$~heterojunction devices with over 1.0{\%} AM1.5G power conversion efficiency for the first time. We implemented highly monochiral (7,5) s-SWCNTs to optimize exciton diffusivity and tailored the device stack to tune the spectral response. External QE of over 35{\%} and 20{\%} are achieved at the~$E_{11}$~bandgap of the s-SWCNTs at 1055 nm and the~$E_{22}$~transition at 655 nm. More than 50{\%} of the AM1.5G photoresponse is derived from the s-SWCNTs, substantially exceeding previous s-SWCNT hybrid devices in which the photoresponse has mostly originated from the organic phase. This work will lead to solar cells based on s-SWCNT photoabsorbers with higher responsivity across the solar spectrum by tailoring the s-SWCNT film morphology and blending them directly with acceptors.