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Modelling of charge carrier transport in conjugated polymers doped by polar additives

Toman P., Nešpůrek S., Bartkowiak W.

Materials Science Poland

2009

Vol. 27, No. 3

797--812

A theoretical model of the inter-chain charge carrier transport in poly[2-methoxy-5-(2´-ethylhexyloxy)- p-phenylene vinylene] doped with a photochromic polar additive is put forward. The model attributes to each polymer chain a set of charge states, in which charge carriers thermalize. These on-chain states are calculated by solving the Schrodinger equation with a tight binding Hamiltonian. The interchain transfer rates are determined using the Marcus formula. The model describes the effect of polar additives on charge carrier transport. The presence of the additives results in a decrease of charge mobility, because of the increase of the local energy disorder. A decrease of the inter-chain mobility by up to several orders of magnitude is found if the width of the local energy disorder is doubled. This finding confirms the possibility of constructing an optoelectrical switch based on a polymer doped with a photochromic polar additive.

Simulation of coulomb-coupled, protein-based logic

Rakos B.

Journal of Automation Mobile Robotics and Intelligent Systems

2009

Vol. 3, No. 4

46-47

In this theoretical work, I investigate photoswitchable proteins as possible building blocks of computing, and signal processing architectures of the future. Coulomb-coupled, photon-pulse controlled macromolecular arrays are proposed and explored with the aid of a simple, mixed quantum-classical, nanoelectromechanical model. I show chains for digital signal propagation, and possibly universal logic gates, therefore computing architectures can be constructed from such proteins. Furthermore, I explore the basic molecular properties needed for their realization, and I show that photoswitchable proteins are possible candidates for this purpose.

Nanotechnology. Science or fiction?

Klusek Z.

Materials Science Poland

2007

Vol. 25, No. 2

283--294

The paper can be treated as a short introduction to nanotechnology and nanoscience bearing in mind evolution of these terms over years. We will introduce basic ideas of nanotechnology like bottom-up versus top-down philosophy, assemblers and nanomachines. Finally, critics of nanotechnology from physical and chemical points of view will be presented leading to hardcore and pragmatic definitions of nanotechnology and nanoscience. The second part of the paper stands on the pragmatic definition of nanotechnology. The basic obstacles to a further miniaturization of conventional semiconductor devices and application of 0D, 1D and 2D semiconductor quantum devices in electronics will be addressed. Basic principles of operation of molecular electronic devices based on self-assembled molecules will be addressed. The author's scanning tunnelling microscopy and spectroscopy results on self-assembled molecules and derivative adducts to C60 molecules will be presented and discussed.

Molecular Logic Citcuits Based Mnemon

Leśniewski A.

Schedae Informaticae

2005

Vol. 14

113-123

This paper describes a foundation for the new class of computer systems components. It is shown that future logie circuits will be created using tools and technologies taken from modern supramolecular chemistry. New molecules will be designed and then synthesized to create advanced molecular computers. In such a computer all calculations will be preformed using the interaction between various molecules. The presented framework is used to show construction of sample molecular adder.

Przekraczanie granic mikroelektroniki

Wąsiewicz P., Mulawka J.

Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne

2001

R. 75, nr 1

8-15

W artykule tym opisano nowe technologie mikro- i nanoelektroniki, m.in. zagadnienia elektroniki molekularnej i organicznej, DNA computing, nowe rodzaje dużej pojemności dysków twardych.

In this paper new technologies in micro- and nanoelectronics such as molecular and organic electronics, DNA computing, massive storage means are described.