Thermoelectric Response in Single Quintuple Layer Bi2Te3

Type
Article

Authors
Sharma, S.
Schwingenschlögl, Udo

KAUST Department
Computational Physics and Materials Science (CPMS)
Material Science and Engineering Program
Physical Science and Engineering (PSE) Division

Online Publication Date
2016-10-05

Print Publication Date
2016-10-14

Date
2016-10-05

Abstract
Because Bi2Te3 belongs to the most important thermoelectric materials, the successful exfoliation of a single quintuple layer has opened access to an interesting two-dimensional material. For this reason, we study the thermoelectric properties of single quintuple layer Bi2Te3 by considering both the electron and phonon transport. On the basis of first-principles density functional theory, the electronic and phononic contributions are calculated by solving Boltzmann transport equations. The dependence of the lattice thermal conductivity on the phonon mean free path is evaluated along with the contributions of the acoustic and optical branches. We find that the thermoelectric response is significantly better for p- than for n-doping. By optimizing the carrier concentration, at 300 K, a ZT value of 0.77 is achieved, which increases to 2.42 at 700 K.

Citation
Sharma S, Schwingenschlögl U (2016) Thermoelectric Response in Single Quintuple Layer Bi2Te3. ACS Energy Letters 1: 875–879. Available: http://dx.doi.org/10.1021/acsenergylett.6b00289.

Acknowledgements
The research reported in this publication was supported by funding from King Abdullah University of Science and Technology (KAUST).

Publisher
American Chemical Society (ACS)

Journal
ACS Energy Letters

DOI
10.1021/acsenergylett.6b00289

Additional Links
http://pubs.acs.org/doi/abs/10.1021/acsenergylett.6b00289

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