Stable Doping of Carbon Nanotubes via Molecular Self Assembly

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Stable Doping of Carbon Nanotubes via Molecular Self Assembly

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Title: Stable Doping of Carbon Nanotubes via Molecular Self Assembly
Author(s):
Lee, B.;
Chen, Y.;
Cook, Alex;
Zakhidov, Anvar A. (UT Dallas);
Podzorov, V.
Sponsors: Alan G. MacDiarmid NanoTech Institute
Item Type: Article
Keywords: Carbon nanotubes (CNT)
Fluoroalkyl tri-chloro-silane (FTS)
Semiconductor doping
Electric conductivity
Abstract: We report a novel method for stable doping of carbon nanotubes (CNT) based on methods of molecular self assembly. A conformal growth of a self-assembled monolayer of fluoroalkyl tri-chloro-silane (FTS) at CNT surfaces results in a strong increase of the sheet conductivity of CNT electrodes by 60-300%, depending on the CNT chirality and composition. The charge carrier mobility of undoped partially aligned CNT films was independently estimated in a field-effect transistor geometry (~100 cm² V⁻¹ s⁻¹). The hole density induced by the FTS monolayer in CNT sheets is estimated to be similar to 1.8 x 10¹⁴ cm⁻². We also show that FTS doping of CNT anodes greatly improves the performance of organic solar cells. This large and stable doping effect, easily achieved in large area samples, makes this approach very attractive for applications of CNTs in transparent and flexible electronics.
ISSN: 0021-8979
Persistent Link: http://hdl.handle.net/10735.1/4245
http://dx.doi.org/10.1063/1.4897550
Terms of Use: ©2014 AIP Publishing LLC
Sponsors: US National Science Foundation (Grant no. NSF-DMR-0843985)

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