Probing the Diameter Limit of Single Walled Carbon Nanotubes in SWCNT: Fullerene Solar Cells. Issue 21 (2nd August 2016)

• Record Type: Journal Article
• Authors: Pfohl, Moritz; Glaser, Konstantin; Graf, Arko; Mertens, Adrian; Tune, Daniel D.; Puerckhauer, Tanja; Alam, Asiful; Wei, Li; Chen, Yuan; Zaumseil, Jana; Colsmann, Alexander; Krupke, Ralph; Flavel, Benjamin S.
• Is Part Of: Advanced energy materials. Volume 6:Issue 21(2016)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2016-08-02
• Subjects: bandgap limit -- near infrared (NIR) -- photovoltaics -- SWCNT -- thin films; Energy harvesting -- Materials -- Periodicals; Energy conversion -- Materials -- Periodicals; Energy storage -- Materials -- Periodicals; Photovoltaics -- Periodicals; Fuel cells -- Periodicals; Thermoelectric materials -- Periodicals; 621.31
• DOI: 10.1002/aenm.201600890
• Languages: English
• ISSNs: 1614-6832

Abstract

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. Abstract : Distribution of various ( n, m ) species that have an internal quantum efficiency (IQE) greater (green) than or equal (grey) to zero, based on their diameter. Depending on their diameter, excitons may or may not be dissociated at the interface of surfactant wrapped single walled carbon nanotubes and C60 .