Regensburg 2016 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 53: Poster II

HL 53.8: Poster

Mittwoch, 9. März 2016, 09:30–13:30, Poster A

Enhancing current-voltage characterisation utilising complementary immittance analysis — •Julian Alexander Amani, Tristan Koppe, Hans Hofsäss, and Ulrich Vetter — II. Physikalisches Institut der Georg-August-Universität Göttingen, Deutschland

Current-voltage characterisation is the standard method of determining underlying conduction mechanisms. Usually performed by measuring the stationary currents under different environmental conditions, mostly at different temperatures, it can be used to identify the conduction processes in single homogeneous pieces of material as well as in heterogeneous systems consisting of multiple materials.

It is almost inevitable that parasitic resistances, e. g. at the contacts, or alternate pathways, for example along surfaces, influence the measurement of the current-voltage characteristics. Identification or removal of the distortions caused by these parasitic contributions, solely using current-voltage measurements, can be complicated.

Complementary immittance spectroscopy can be used to identify and remove the parasitic contributions, often even without the need to understand the specific parasitic processes in detail. We will present a strategy to remove and, if desired, identify parasitic contributions with little overhead. Although not limited to specific contact arrangements, we will show certain geometries that simplify the complementary immittance measurement process. Finally, we discuss whether immittance spectroscopy can replace conventional current-voltage characterisation altogether.