Carbon nanotube field effect transistors for power application

Carbon nanotubes (CNTs) are nanometer-diameter cylinders formed from rolled-up graphene sheets which have found widespread interests due to their many excellent electrical properties. In particular, most of them are direct bandgap semiconductors from which carbon nanotube field effect transistors (CNTFETs) can be made. The small feature size and high electron mobility of the CNT makes it attractive and a good candidate to replace modern MOSFETs. So far, most fabricated CNTFETs conduct currents only on the order of microamps under low voltage bias which cannot be used to drive large output loads. In this work, we attempt to explore the ultimate performance benefits from utilizing multiple CNTs for CNTFETs. Two ways of making multi-tube CNTFETs are demonstrated in this thesis. Devices are fabricated, measured and analyzed. A simple model is used to evaluate the ideal ballistic behavior of CNTFETs. Parasitics that are measured from experiments and extracted from numerical tools are added to the model. As an application, we compare the performance of CNTFETs with MOSFETs, both used as power transistors in a Buck DC-DC converter circuit.

Department dc:contributor.department

Massachusetts Institute of Technology. Dept. of Electrical Engineering and Computer Science.

Grantor dc:publisher

Massachusetts Institute of Technology

Year dc:date.issued

2007

Author dc:creator

• Pan, Tao, S.M. Massachusetts Institute of Technology

Advisor dc:contributor.advisor

• Anantha P. Chandrakasan and Jing Kong.

• Electrical Engineering and Computer Science.

Statement dc:rights

• M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission.

Licence dc:rights.uri

• http://dspace.mit.edu/handle/1721.1/7582

Language dc:language.iso

eng

Handle dc:identifier.uri

http://hdl.handle.net/1721.1/40527

OAI identifier oai:identifier

oai:dspace.mit.edu:1721.1/40527