Stefan Blawid

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The effective-mass Schrödinger equation is solved directly for the wave functions to explore the steady state and the time-dependent quantum-ballistic transport in Schottky barrier carbon nanotube (CNT) field-effect transistors (FETs). The employed contact parameters allow for discontinuities of the effective mass at the metal-CNT interface, and(More)
Recent experimental investigations of sub-10nm carbon nanotube (CNT) field-effect transistors (FETs) promote CNT based 1D-electronics as a candidate for a future aggressively scaled transistor technology. However, the ballistic transport within the 1D semiconducting CNT channel is largely determined by charge injection from the contacts rendering reliable(More)
A time-dependent effective-mass SchrödingerPoisson solver is used to study the frequency dependence of the gate capacitance of a short Schottky-barrier carbon nanotube field-effect transistor (CNTFET). A delayed (re)charging of the channel causes a (non-quasi-static) drop of the gate capacitance for higher frequencies on a characteristic scale, which can be(More)
Undoped channel materials and multiple independent gates allow reconfiguration of the transistor operation between n- and p-type behavior. Materials with low effective masses allow in addition to switch on demand between a highperformance (HP) and a low-power (LP) mode, operating the transistor beyond and below the 60 mV/dec subthreshold slope limit,(More)
This paper gives a short overview on our recent investigations towards a multiscale modeling and simulation framework for metal-CNT interfaces. We employ three simulation approaches with well defined interfaces. For the simulation at device level we make use of a recently developed wave-function based effective-mass Schrödinger-Poisson solver which(More)
We present an extensive study of the optical properties of Myrcia sylvatica essential oil with the goal of investigating the suitability of its material system for uses in organic photovoltaics. The methods of extraction, experimental analysis, and theoretical modeling are described in detail. The precise composition of the oil in our samples is determined(More)
Pentacene is an organic semiconductor that draws special attention from the scientific community due to the high mobility of its charge carriers. As electron-hole interactions are important aspects in the regard of such property, a computationally inexpensive method to predict the coupling between these quasi-particles is highly desired. In this work, we(More)
The acceptance of an emerging revolutionary process technology for circuit and system design depends significantly on (i) unique device features provided by the technology, (ii) a reliable fabrication process, and (iii) a suitable transistor compact model for circuit design and simulation. Carbon nanotube (CNT) field-effect transistors (FETs) belong to a(More)
Phthalocyanines represent a crucial class of organic compounds with high technological appeal. By doping the center of these systems with metals, one obtains the so-called metal-phthalocyanines, whose property of being an effective electron donor allows for potentially interesting uses in organic electronics. In this sense, investigating optical and(More)