Dresden 2014 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 11: Focus Session: Sensoric Micro and Nano-systems I
DS 11.7: Vortrag
Dienstag, 1. April 2014, 11:45–12:00, CHE 89
Carbon nanotubes under strain: Ab-initio investigations and compact models — •Christian Wagner1, Vladimir Kolchuzhin2, Erik Markert2, Jörg Schuster3, Jan Mehner2, and Thomas Gessner1,3 — 1Center for Microtechnologies, TU Chemnitz, Germany — 2Faculty of Electrical Engineering and Information Technology, TU Chemnitz, Germany — 3Fraunhofer Institute for Electronic Nano Systems (ENAS), Chemnitz, Germany
Carbon nanotubes (CNTs) are not only attracting high interest in research, but also from the application point of view. Their mechanical strength and their outstanding piezoresistive response is one example that makes them suitable for novel sensors. These properties are well-explored for pristine Single-walled CNTs. But there is a lack of quantitative description of realistic CNTs in sensor environments.
Thus, this talk focuses on one hand on ab-initio-results of the electronic structure and transport properties of defective and functionalized CNTs under strain. And on the other hand we want to condense these results in compact models that can be incorporated in large-scale sensor simulations.
The first part concerns the comparison of simplified models to DFT results of strained CNTs [1] and shows its limits. Further, the electronic transport with different simplifications including scattering is elucidated. In the second part, these effective models for all available CNT chiralities will then be used to define compact models for sensor simulations by parametrization of electronic structure results.
[1] Wagner, C. et al., Phys. Stat. Sol. B, 249, 2450 (2012)