Dresden 2009 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 9: Poster 1

HL 9.48: Poster

Montag, 23. März 2009, 14:30–17:00, P2

Determination of Hall-mobilities using a maximum entropy approach — •Robert Heinhold, Matthias Brandt, Holger von Wenckstern, Gisela Biehne, Holger Hochmuth, Michael Lorenz, and Marius Grundmann — Universität Leipzig, Semiconductor Physics Group, Institut für Experimentelle Physik II, Leipzig, Germany

Hall measurements are one of the most commonly used techniques to characterize semiconductors. Such measurements are integral measurements and do, therefore, require homogeneous samples. Nevertheless, it is possible to differentiate layers with different mobilities by performing variable field Hall effect measurements. In this work we employ an iterative algorithm for a multi-carrier characterization using the maximum entropy principle (MEP) [1]. The main concept is to consider the mobility spectrum in the form of a probability distribution which we use to define the information entropy. Maximizing this entropy leads us to the most probable spectrum of carrier mobilities and their relative contribution to the total conductivity. We applied the MEP method to analyze the data measured on various semiconductor single-crystals and multi-heterostructures.

[1] S. Kiatgamolchai et al.: Phys. Rev. E 66, 036705 (2002).