Magneto- SEEBECK coefficient Bi1-XSbX microwires for thermoelectric applications
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2020-10-13 19:41
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NIKOLAEVA, Albina; KONOPKO, Leonid; HUBER, Tito; POPOV, Ivan; KOBYLIANSKAYA, A.K.. Magneto- SEEBECK coefficient Bi1-XSbX microwires for thermoelectric applications. In: Electronics, Communications and Computing. Editia a 10-a, 23-26 octombrie 2019, Chişinău. Chișinău, Republica Moldova: 2019, p. 67. ISBN 978-9975-108-84-3.
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Electronics, Communications and Computing
Editia a 10-a, 2019
Conferința "Electronics, Communications and Computing"
Chişinău, Moldova, 23-26 octombrie 2019

Magneto- SEEBECK coefficient Bi1-XSbX microwires for thermoelectric applications


Pag. 67-67

Nikolaeva Albina1, Konopko Leonid1, Huber Tito2, Popov Ivan1, Kobylianskaya A.K.1
 
1 Ghitu Institute of Electronic Engineering and Nanotechnology,
2 Howard University
 
Disponibil în IBN: 8 noiembrie 2019


Rezumat

Due to development of new concepts such as the low- dimensional structures [1] and influence the quantum confinement of change carrier acoustic phonon –boundary scattering for increase figure of merit ZT=2/(T) opened up a completely different strategy for ZT enhancement in one- dimensional structures [1].   We study the thermoelectric properties of Bi1-xSbx in semimetal and semiconductor wires with different diameter in the presence of magnetic field in the temperature range 4.2- 300 K. Single- crystal Bi1-xSbx micro- and nanowires with orientation (1011) with diameter 60 – 1000 nm in glass capillary were prepared by Ulitovsky method [2]. Semimetal Bi-2at%Sb nanowires exhibited a semimetal- semiconductor transition (SMSCT) (according effect size quantization) at dc= 300 nm which is on five times higher, than dc for pure Bi nanowires. The reason is that the electron (L), hole (T) energy overlap- according calculations, received from Shubnikov de Haas oscillations in 2 times less then in pure bismuth. It was establish that at the SMSCT the thermopower becomes positive and considerably increase with reduction of wire diameters. Here we demonstrate experimentally that Bi1-xSbx micro and nanowires display positive shifts in longitudinal and transverse magneto-thermopower in slowly magnetic field (0.4 T), at high range temperature (T< 200 K).  It is know that the production p- branches in thermoelectric converters is a challenge, especially at T< 150 K. This approach may enable the development of low- cost thermoelectric materials and providing access to high powder thermal energy conversation applications. 

Cuvinte-cheie
nanowires, quantum size effect, magnetothermopower, Thermoelectric efficiency