Probing the Diameter Limit of Single Walled Carbon Nanotubes in SWCNT: Fullerene Solar Cells |
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| Authors: | Moritz Pfohl Konstantin Glaser Arko Graf Adrian Mertens Daniel D Tune Tanja Puerckhauer Asiful Alam Li Wei Yuan Chen Jana Zaumseil Alexander Colsmann Ralph Krupke Benjamin S Flavel |
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| Institution: | 1. Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany;2. Institute of Materials Science, Technische Universit?t Darmstadt, Darmstadt, Germany;3. Light Technology Institute, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany;4. Institute for Physical Chemistry, Universit?t Heidelberg, Heidelberg, Germany;5. Centre for Nanoscale Science and Technology, Flinders University, Adelaide, Australia;6. School of Chemical and Biomolecular Engineering, The University of Sydney, NSW, Australia |
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| Abstract: | In this work, for the first time, the diameter limit of surfactant wrapped single walled carbon nanotubes (SWCNTs) in SWCNT:C60 solar cells is determined through preparation of monochiral small and large diameter nanotube devices as well as those from polychiral mixtures. Through assignment of the different nanotube chiralities by photoluminescence and optical density measurements a diameter limit yielding 0% internal quantum efficiency (IQE) is determined. This work provides insights into the required net driving energy for SWCNT exciton dissociation onto C60 and establishes a family of (n,m) species which can efficiently be utilized in polymer‐free SWCNT:C60 solar cells. Using this approach the largest diameter nanotube with an IQE > 0% is found to be (8,6) with a diameter of 0.95 nm. Possible strategies to extend this diameter limit are then discussed. |
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| Keywords: | bandgap limit near infrared (NIR) photovoltaics SWCNT thin films |
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