Charge transport in organic semiconductor devices - necessity of and attempt to an improved theoretical description
Markus Krammer
Institute of Solid State Physics
10:50 - 11:30 Friday 10 May 2019 HS P3 (PH02112)

Organic electronics offer a wide range of applications that perfectly fit our modern life requirements. Their flexibility and biocompatibility enables applications beyond the scope of conventional inorganic semiconductors. On the road to true organic electronics, organic thin-film transistors (OTFTs) are an important bottleneck to fabricate efficient integrated circuits. Furthermore, OTFTs are a well established tool to obtain material properties and they are well suited to test theoretical charge transport models due to their ability to independently tune the charge carrier density and the electric field strength in the device.
In the first part of this lecture, we will take a look at our novel concept to test charge transport models with the help of OTFTs.[1] The outcome of this model test suggests that recent charge transport models have to be improved. This outcome guides us to the second part of the lecture, in which we will dive into the basics of charge transport in organic semiconductors within the framework of hopping transport. From those basics, we will develop an understanding of the reasons behind charge transport regimes and how charge carrier density and electric field strength influence charge transport.

[1] M. Krammer, J. W. Borchert, A. Petritz, E. Karner-Petritz, G. Schider, B. Stadlober, H. Klauk, and K. Zojer: Critical Evaluation of Organic Thin-Film Transistor Models, Crystals 9, 85 (2019) doi:10.3390/cryst9020085