Empirical transport model of strained CNT transistors used for sensor applications

cnt_psCarbon nanotubes show electronic properties which are remarkably sensitive to mechanical strain. Thus, CNTs are expected to be promising candidates for nano scale strain sensors.  Even more, they are discussed as a key component of future nano-opto-electro-mechanical systems (NOEMS).

Consequently, a comprehensive model for strained CNT transistors was recently published by Christian . Continue reading

Surface chemistry of copper metal and copper oxide atomic layer deposition


In a recent paper in Physical chemistry chemical Physis we study the mechanisms for atomic layer deposition using the Cu(acac)2 precursor . By first-principles calculations and reactive molecular dynamics simulations we show that Cu(acac)2 chemisorbs on the hollow site of the Cu(110) surface and decomposes easily into a Cu atom and the acac-ligands. Continue reading

Modeling the in situ repair of ULK dielectrics


Ultra low-k dielectrics are one of the key components  which allow for further shrinking of the the interconnect system used in todays semiconductor technology. During manufacturing steps such as trench etching the ULK material is degraded and some repair chemistry is required to restore its k-value. In a recent paper which appeared in Journal of Vacuum Science and technology   Anja now modeled elementary steps of such an in-situ repair approach by using DFT calculations.   Continue reading

Christian @USA

Christian now went to US for a few months. He will study advanced electronic structure calculations in André Schleife’s group at the university of Illinois at Urbana-Champaign. Christian will use the methods  to calculate the optical properties of CNTs which will finally complement his PhD. André, who initially comes from Chemnitz as well, is a recognized expert in this field. We wish Christian a good and succesfull stay and thank André for his support.

Watch the Christian @USA blog to be up to date!