Enhanced Thermoelectric Performance of n-type Bi2O2Se Ceramics Induced by Ge Doping

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216275%3A25310%2F18%3A39911018" target="_blank" >RIV/00216275:25310/18:39911018 - isvavai.cz</a>
Alternative codes found
RIV/61389013:_____/18:00484654
Result on the web
<a href="https://link.springer.com/article/10.1007/s11664-017-5952-4" target="_blank" >https://link.springer.com/article/10.1007/s11664-017-5952-4</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1007/s11664-017-5952-4" target="_blank" >10.1007/s11664-017-5952-4</a>

Result language
angličtina
Original language name
Enhanced Thermoelectric Performance of n-type Bi2O2Se Ceramics Induced by Ge Doping
Original language description
Ceramic samples with the composition Bi2xGexO2Se1.01 (x = 0, 0.05, 0.075,and 0.1) were synthesized by solid-state reaction and compacted using a hotpressing technique. The prepared materials were characterized by x-ray diffraction analysis, electron microscopy, and measurements of electrical conductivity, Seebeck coefficient S, and thermal conductivity in the temperature range 300–780 K. Ge in the Bi2O2Se host structure led to an increase of the free electron concentration compared to pristine Bi2O2Se1.01. The donor effect is attributed to point substitutional defects in the Bi sublattice, and oxygen vacancies producing free electrons. As a result, we observe an increase in the electrical conductivity and decrease in Seebeck coefficient while thermal conductivity changes slightly. The highest value of the dimensionless figure of merit ZT reaches 0.25 for the composition Bi1.95Ge0.05O2Se1.01 at T = 723 K, which is, to date, the highest ZT value reported for Bi2O2Se ceramics. Our results suggest that Bi2O2Se is still worth exploring.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Project
<a href="/en/project/GA16-07711S" target="_blank" >GA16-07711S: A systematic study of Schottky barrier height effect on energy filtering of electrons in thermoelectric nanocomposites.</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2018
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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