Journal
ACS NANO
Volume 5, Issue 1, Pages 283-290Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn1027032
Keywords
organic transistors; charge carrier injection; ambipolar transport; carbon nanotubes; Schottky barriers; contacts
Categories
Funding
- European Commission [MC-OIF-CT-2006-040864]
- Canada Research Chair (CRC)
- NSERC
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We investigated the performance of carbon nanotube (CNT) array electrodes applied to n-type and ambipolar phenyl-C61-butyric acid methyl ester (PCBM) thin film transistors on a SiO2 dielectric substrate. Compared to conventional Au electrodes, CNT arrays provide better injection efficiency improved switching behavior, higher electron mobility, and lower contact resistance. Experiments on ambipolar PCBM transistors, indicate that the Injection performance is enhanced by the electrostatics of the CNT contacts, which promotes electron and hole tunneling across Schottky barriers at the PCBM/nanotube interface. The use of or arrays is a valid replacement to low workfunction Metals, which are often reactive in air and difficult to process. Our work paves the way for a Widespread use of carbon nanotube array electrodes in high-performance n-type and p-type organic thin film transistors.
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