Detailed Information

Cited 0 time in webofscience Cited 17 time in scopus
Metadata Downloads

Role of O and Se defects in the thermoelectric properties of bismuth oxide selenide

Authors
Quang Van TranKim, Miyoung
Issue Date
Nov-2016
Publisher
AMER INST PHYSICS
Citation
JOURNAL OF APPLIED PHYSICS, v.120, no.19
Journal Title
JOURNAL OF APPLIED PHYSICS
Volume
120
Number
19
URI
https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/9368
DOI
10.1063/1.4967989
ISSN
0021-8979
Abstract
Bismuth oxygen selenide, Bi2O2Se, is a promising thermoelectric material because of its reduced thermal conductivity. In this study, we perform the first-principles calculation and utilize the solution of Boltzmann transport equation in a constant relaxation-time approximation to compute the electronic and thermoelectric properties of Bi2O2Se with O and Se defects. Oxygen vacancies trap bands located inside the band gap of Bi2O2Se, and the compound becomes a conductor. These bands lead to drastic reduction in the Seebeck coefficient. When vacancies are filled by selenide atoms (selenide point defect), the materials return to be a semiconductor and the Seebeck coefficient increases. The increase of S is also found in the system with defects formed by the substitution of oxygen atoms into selenide sites (oxygen point defect) in the pristine compound. The power factor significantly increases during p-type doping compared with that during n-type doping for the selenide point defect. However, differences in the two doping cases are less distinguished for the oxygen point defect. Hence, the selenide point defect, Bi2O2-delta Se1-delta with p-type doping, is an effective way to increase the power factor and eventually the thermoelectric efficiency of Bi2O2Se. Published by AIP Publishing.
Files in This Item
Go to Link
Appears in
Collections
ICT융합공학부 > 응용물리전공 > 1. Journal Articles

qrcode

Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.

Related Researcher

Researcher Kim, Mi Young photo

Kim, Mi Young
ICT융합공학부 (응용물리전공)
Read more

Altmetrics

Total Views & Downloads

BROWSE