Journal
APPLIED PHYSICS LETTERS
Volume 107, Issue 14, Pages -Publisher
AIP Publishing
DOI: 10.1063/1.4932942
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Funding
- European Union [604472, 314068]
- Aalto Energy Efficiency (AEF) program through the MOPPI project
- TEKES project CARLA
- TEKES project USG
- Academy of Finland (HISCON)
- Academy of Finland [276160]
- Ministry of Education and Science of the Russian Federation [DOI: RFMEFI58114X0006]
- Austrian Science Fund (FWF) [M 1497-N19]
- Finnish Cultural Foundation
- Walter Ahlstrom Foundation
- Austrian Science Fund (FWF) [P 28322, M 1497] Funding Source: researchfish
- Austrian Science Fund (FWF) [P28322] Funding Source: Austrian Science Fund (FWF)
- Academy of Finland (AKA) [276160, 276160] Funding Source: Academy of Finland (AKA)
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The ultimate performance-ratio of electrical conductivity to optical absorbance-of single-walled carbon nanotube (SWCNT) transparent conductive films (TCFs) is an issue of considerable application relevance. Here, we present direct experimental evidence that SWCNT bundling is detrimental for their performance. We combine floating catalyst synthesis of non-bundled, high-quality SWCNTs with an aggregation chamber, in which bundles with mean diameters ranging from 1.38 to 2.90 nm are formed from identical 3 mu m long SWCNTs. The as-deposited TCFs from 1.38 nm bundles showed sheet resistances of 310 Omega/square at 90% transparency, while those from larger bundles of 1.80 and 2.90 nm only reached values of 475 and 670 Omega/square, respectively. Based on these observations, we elucidate how networks formed by smaller bundles perform better due to their greater interconnectivity at a given optical density. Finally, we present a semi-empirical model for TCF performance as a function of SWCNT mean length and bundle diameter. This gives an estimate for the ultimate performance of non-doped, random network mixed-metallicity SWCNT TCFs at similar to 80 Omega/square and 90% transparency. (C) 2015 AIP Publishing LLC.
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