Thermoelectric and electrical transport properties of Bi2Te3 compacted nanoparticles bulk material

Izadi S (2021)
Bielefeld: Universität Bielefeld.

Bielefelder E-Dissertation | Englisch
 
Download
OA 5.03 MB
Abstract / Bemerkung
Three-dimensional (3D) topological insulators (TI) host surface carriers with extremely high mobility. However, their transport properties are typically dominated by bulk carriers that outnumber the surface carriers by orders of magnitude. We herein present a strategy to overcome the problem of bulk carrier domination by using 3D TI nanoparticles, which were compacted by hot-pressing to macroscopic nanograined bulk samples. Bi2Te3 nanoparticles well known for their excellent thermoelectric and 3D TI properties serve as our model system. As key enabler for this approach, we applied a specific synthesis that creates nanoparticles with a low level of impurities and surface contamination. The compacted nanograined bulk contains a high number of interfaces and grain boundaries. Here we show that these samples exhibit metallic-like electrical transport properties and a distinct weak antilocalization. A downwards trend in the electrical resistivity at temperatures below 5 K was attributed to an increase in the coherence length by applying the Hikami-Larkin-Nagaoka model. THz time-domain spectroscopy revealed a dominance of the surface transport at low frequencies with a mobility of above 〖10〗^3 cm^2 V^(-1) s^(-1) even at room temperature. These findings clearly demonstrate that nanograined bulk Bi2Te3 features surface carrier properties that are of importance for technical applications.
Jahr
2021
Seite(n)
113
Page URI
https://pub.uni-bielefeld.de/record/2957607

Zitieren

Izadi S. Thermoelectric and electrical transport properties of Bi2Te3 compacted nanoparticles bulk material. Bielefeld: Universität Bielefeld; 2021.
Izadi, S. (2021). Thermoelectric and electrical transport properties of Bi2Te3 compacted nanoparticles bulk material. Bielefeld: Universität Bielefeld. https://doi.org/10.4119/unibi/2957607
Izadi, S. (2021). Thermoelectric and electrical transport properties of Bi2Te3 compacted nanoparticles bulk material. Bielefeld: Universität Bielefeld.
Izadi, S., 2021. Thermoelectric and electrical transport properties of Bi2Te3 compacted nanoparticles bulk material, Bielefeld: Universität Bielefeld.
S. Izadi, Thermoelectric and electrical transport properties of Bi2Te3 compacted nanoparticles bulk material, Bielefeld: Universität Bielefeld, 2021.
Izadi, S.: Thermoelectric and electrical transport properties of Bi2Te3 compacted nanoparticles bulk material. Universität Bielefeld, Bielefeld (2021).
Izadi, Sepideh. Thermoelectric and electrical transport properties of Bi2Te3 compacted nanoparticles bulk material. Bielefeld: Universität Bielefeld, 2021.
Alle Dateien verfügbar unter der/den folgenden Lizenz(en):
Creative Commons Namensnennung - Nicht kommerziell - Keine Bearbeitungen 4.0 International (CC BY-NC-ND 4.0):
Volltext(e)
Access Level
OA Open Access
Zuletzt Hochgeladen
2021-09-23T11:16:11Z
MD5 Prüfsumme
59d8cc474cb950848e757b7187f4c9ed

Export

Markieren/ Markierung löschen
Markierte Publikationen

Open Data PUB

Suchen in

Google Scholar