Subject Area A4: Thermionic Nanostructures Consisting of Metal-Semiconductor-Superlattices
Wolfgang Hansen, Kornelius Nielsch
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.
Energetic scheme of thermionic nanostructures.
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.
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).
Atomic-layer deposition of nitride-based thermionic superlattices
Thermoelectric characterization of MnAs barrier layers in GaAs superlattices