Back to Search Start Over

Contribution of radial dopant concentration to the thermoelectric properties of core-shell nanowires

Authors :
Ting S. Luk
Jeong Hyun Cho
Jian Yu Huang
Xiaohua Liu
S. T. Picraux
Brian S. Swartzentruber
Julio A. Martinez
John P. Sullivan
Source :
Applied Physics Letters. 102:103101
Publication Year :
2013
Publisher :
AIP Publishing, 2013.

Abstract

We report the thermoelectric characteristics of core-shell p-type germanium nanowires (GeNWs) (lightly doped core, heavily doped shell). Overall, the thermoelectric characteristics are dominated by the heavily doped shell. Experimental data indicate that surface states produce dopant deactivation when the heavily doped shell is removed. Under this situation, the thermoelectric figure of merit is degraded. Etching the heavily doped shell resulted in a rough germanium nanowire with a thermal conductivity close to 1.1 W/m-K at 300 K, which is one of the smallest k measured for nanowires and comparable to the thermal conductivity of bulk SiO2.

Details

ISSN :
10773118 and 00036951
Volume :
102
Database :
OpenAIRE
Journal :
Applied Physics Letters
Accession number :
edsair.doi...........608719c06bad5c58a41959aada75bbad