A roadmap from modeling transport in organic semiconductors to challenges in paper
Karin Zojer
Institute of Solid State Physics, TU Graz
11:15 - 12:15 Wednesday 14 March 2018 PH01150 What have organic semiconductors and paper in common? What is the answer having transport modeling in mind?
Fueled by my experience in modeling charge transport in organic devices, I am convinced that the fields of organic electronics and paper can cross-fertilize each other, albeit these fields appear to be fully disjunct.
Answered from the perspective of transport modeling, organic semiconducting layers employed for electronic applications and paper sheets share two essential features. Firstly, technologically relevant semiconducting layers and paper sheets are disordered. Secondly, the layers and the paper sheets posses huge aspect ratios. While many organic electronic devices realize large area applications up to the square centimeter range, the active layers are only a few tens of nanometers thick. Paper sheets posses a similar asymmetry in its characteristic extensions. Common paper sheets, e.g., for printing, are 70-300 micrometer thick, but cover areas of 30 x 20 square centimeters.
The presence of disorder and large aspect ratios impose challenges for an adequate theoretical description of transport processes and the prediction of material and device properties governed by transport.
I will utilize two examples to illustrate such challenges in organic electronic devices and paper and contemporary approaches.
The first example, nested in the field of organic semiconductors, will explore how disorder present in semiconductors governs processes such as charge injection and electric doping.
In a second example, I will show how to acquire and mathematically analyze the microstructure of paper. I will demonstrate that such an analysis is a crucial prerequisite to design adequate models for mass transport through paper.
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Institute of Solid State Physics
