Temperature dependence of the atomic structure and electrical activity of defects in ZnSb thermoelectric lightly doped with copper
- 作者: Prokofieva L.1, Nasredinov F.2, Konstantinov P.1, Shabaldin A.1
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隶属关系:
- Ioffe Institute
- Peter the Great St. Petersburg Polytechnical University
- 期: 卷 51, 编号 9 (2017)
- 页面: 1119-1126
- 栏目: Electronic Properties of Semiconductors
- URL: https://journals.rcsi.science/1063-7826/article/view/201087
- DOI: https://doi.org/10.1134/S1063782617090172
- ID: 201087
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详细
A model for describing the temperature dependence of the defect microstructure in high-efficiency ZnSb thermoelectric with a copper content of 0.1 at % is chosen. The temperature dependences of the chargecarrier density and mobility for thermal cycle I (300–700–300 K) are analyzed taking into account the features of the crystal structure and covalent chemical bond in ZnSb. The basic defect structure (at temperatures of T = 560–605 K) is the state when all Cu atoms are equally distributed between sites of both sublattices and behave as acceptors, and the number of intrinsic donor and acceptor defects is much smaller. The effect of the latter becomes noticeable when the temperature goes beyond the above-mentioned range. At T > 605 K, extra acceptors (antisite ZnSb) occur; upon cooling below 560 K, Cu2 dimers arise and the electrical activity of the impurity lowers. Dimer decay upon heating leads to growth in the concentration with temperature up to saturation in the above-mentioned range. Additional thermal cycles II–VIII are performed; the observed changes in the temperature dependences of the hole concentration and mobility are discussed in the context of the investigated model.
作者简介
L. Prokofieva
Ioffe Institute
编辑信件的主要联系方式.
Email: lprokofieva496@gmail.com
俄罗斯联邦, St. Petersburg, 194021
F. Nasredinov
Peter the Great St. Petersburg Polytechnical University
Email: lprokofieva496@gmail.com
俄罗斯联邦, St. Petersburg, 195251
P. Konstantinov
Ioffe Institute
Email: lprokofieva496@gmail.com
俄罗斯联邦, St. Petersburg, 194021
A. Shabaldin
Ioffe Institute
Email: lprokofieva496@gmail.com
俄罗斯联邦, St. Petersburg, 194021