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This section is unavailable in an archive version of a tool. Consult the latest published version 1.02 for most current information.

CNT Heterojunction Modeler

By Joe Ringgenberg1, Joydeep Bhattacharjee2, Jeffrey B. Neaton3

1. University of California, Berkeley 2. Molecular Foundry, Lawrence Berkeley National Laboratory 3. Lawrence Berkeley National Laboratory

Study the structure and electronic properties of carbon nanotubes with linear heterojunctions.

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Archive Version 1.0
Published on 24 Jun 2008, unpublished on 07 Jul 2008
Latest version: 1.02. All versions

doi:10.4231/D33B5W747 cite this

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Abstract

Since their invention, carbon nanotubes(CNT), which can be both semiconducting as well as metallic, have been postulated to have interesting active device aspects. For example, heterojunctions, made of two CNTs of different chiralities joined together through an interface of topological defects, have been associated with rectifying diode behavior. Determination of meaningful structures of these interfaces constitutes a major part of the study of such heterojunctions. In principle, any two CNTs of different chiralities can be joined through a single pentagon-heptagon pair, often forming a kinked interface, resulting into highly bent heterojunctions. Here we present a tool which renders the structure of linear heterojunctions between two CNTs of different chiralities but similar radii, joined together through an interface that may require more than one pentagon-heptagon defects. Subsequently, within a nearest neighbor tight-binding approximation, the tool provides density of states and zero bias transmission, as a functions of energy, calculated assuming semi-infinite CNT electrodes of matching chiralities on the two sides of the heterojunction.

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