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Issue 40, 2020

Spatially resolved thermoelectric effects in operando semiconductor–metal nanowire heterostructures

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Abstract

The thermoelectric properties of a nanoscale germanium segment connected by aluminium nanowires are studied using scanning thermal microscopy. The germanium segment of 168 nm length features atomically sharp interfaces to the aluminium wires and is surrounded by an Al2O3 shell. The temperature distribution along the self-heated nanowire is measured as a function of the applied electrical current, for both Joule and Peltier effects. An analysis is developed that is able to extract the thermal and thermoelectric properties including thermal conductivity, the thermal boundary resistance to the substrate and the Peltier coefficient from a single measurement. Our investigations demonstrate the potential of quantitative measurements of temperature around self-heated devices and structures down to the scattering length of heat carriers.

Graphical abstract: Spatially resolved thermoelectric effects in operando semiconductor–metal nanowire heterostructures

Supplementary files

Article information


Submitted
24 Jul 2020
Accepted
25 Sep 2020
First published
08 Oct 2020

This article is Open Access

Nanoscale, 2020,12, 20590-20597
Article type
Communication

Spatially resolved thermoelectric effects in operando semiconductor–metal nanowire heterostructures

N. Gächter, F. Könemann, M. Sistani, M. G. Bartmann, M. Sousa, P. Staudinger, A. Lugstein and B. Gotsmann, Nanoscale, 2020, 12, 20590 DOI: 10.1039/D0NR05504B

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