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Description
Selection of Literature
Possible Subjects for Ph. D. Theses

Subject Area A4: Thermionic Nanostructures Consisting of Metal-Semiconductor-Superlattices

Wolfgang Hansen, Kornelius Nielsch


Energetic scheme of thermionic nanostructures.

Description

Thermionic solid structures are a new class of materials that can be used for gaining electrical current from residual heat. Classical thermoelectric materials consist of homogeneous semiconductors. Typical wavelengths of band transitions lie in the order of several micrometers. Thermionic structures consist of alternating metal and semiconductor layers (superlattices). They are also called artificial thermoelectric materials.

In this subject area we want to fabricate thermionic nanostructures by atomic-layer epitaxy. The thermoelectric properties of superlattices with different periodicities will be studied. The electrical conductivity and the thermal conductivity as well as the Seebeck coefficient shall be determined parallel and perpendicular to the layers. The experiments will be complemented by simulations of the electrical and thermal transport.

Selection of Literature

J. Sommerlatte, K. Nielsch and H. Böttner,
"Nanotechnologische thermoelektrische Materialien - kunstvolle Partituren für neuartige TE-Materialen",
Physik Journal 6, 35-42 (May 2007).

M. Knez, K. Nielsch and L. Niinistö,
"Synthesis and Surface Engineering of Complex Nanostructures by Atomic Layer Deposition",
Advanced Materials 19, 3425-3438 (2007).

R.B. Yang, N. Zakharov, O. Moutanabbir, K. Scheerschmidt, L. M. Wu, U. Gösele, J. Bachmann and K. Nielsch,
"The Transition between Conformal Atomic Layer Epitaxy and Nanowire Growth",
J. Am. Chem. Soc. 132, 7592-7594 (2010).

Possible Subjects for Ph. D. Theses

Atomic-layer deposition of nitride-based thermionic superlattices

Thermoelectric characterization of MnAs barrier layers in GaAs superlattices
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