Substitutional and interstitial impurity p-type doping of thermoelectric Mg2Si: a theoretical study

Substitutional and interstitial impurity p-type doping of thermoelectric Mg2Si: a theoretical study
复制标题

热电Mg2Si的取代和间隙杂质p型掺杂:理论研究

DOI:
10.1080/14686996.2019.1580537
复制
发表时间:
2019
影响因子:
5.5
通讯作者:
Hamada Noriaki
Hamada Noriaki
中科院分区:
材料科学2区
文献类型:
--
作者:
Hirayama Naomi;Iida Tsutomu;Sakamoto Mariko;Nishio Keishi;Hamada Noriaki

文献摘要

参考文献

相似文献

窄禁带硅化镁半导体Mg_2Si是一种很有前途的中温(600-900 K)热电材料。它本质上具有n型导电性,通常使用n型掺杂剂来改善其热电性能;然而,p型Mg 2Si的合成相对困难。在这项工作中,空穴掺杂的Mg 2Si与各种杂质原子进行第一性原理计算研究。结果表明,Ag掺杂体系在不同杂质位(Mg、Si和间隙4 b杂质位)下的形成能Δ E相当,这可以解释其p型电导率的实验不稳定性.对于引入碱金属(Li、Na和K)的系统,观察到类似的现象,因为它们对于Mg(p型)和4 b(n型)位置测定的Δ E值非常接近。在硼族元素(Ga和B)中,发现Ga对于空穴掺杂是有利的,因为它对于Si(p型)位点表现出相对小的Δ E值。此外,由于Cl和F原子的高电负性,Cl和F原子在晶格中的间隙插入导致空穴掺杂。
The narrow-gap magnesium silicide semiconductor Mg2Si is a promising mid-temperature (600–900 K) thermoelectric material. It intrinsically possesses n-type conductivity, and n-type dopants are generally used for improving its thermoelectric performance; however, the synthesis of p-type Mg2Si is relatively difficult. In this work, the hole doping of Mg2Si with various impurity atoms is investigated by performing first principles calculations. It is found that the Ag-doped systems exhibit comparable formation energies ΔEcalculated for different impurity sites (Mg, Si, and interstitial 4b ones), which may explain the experimental instability of their p-type conductivity. A similar phenomenon is observed for the systems incorporating alkali metals (Li, Na, and K) since their ΔEvalues determined for Mg (p-type) and 4b (n-type) sites are very close. Among boron group elements (Ga and B), Ga is found to be favorable for hole doping because it exhibits relatively small ΔEvalues for Si (p-type) sites. Furthermore, the interstitial insertion of Cl and F atoms into the crystal lattice leads to hole doping because of their high electronegativity.
Si 中的氟:天然缺陷复合物和抑制杂质扩散
DOI: 10.1103/physrevb.72.045219
发表时间: 2005
期刊: Physical Review B
影响因子: 3.7
作者:
G. M. Lopez;V. Fiorentini;G. Impellizzeri;S. Mirabella;E. Napolitani
通讯作者: E. Napolitani
DOI: --
发表时间: 2012
期刊:
影响因子: --
作者:
嶋村祐介;李 美龍,成田 吉弘;Tsutomu Iida
通讯作者: Tsutomu Iida
DOI: 10.1007/s11664-012-2450-6
发表时间: 2013-02
影响因子: 2.1
作者:
T. Kajitani;M. Kubouchi;S. Kikuchi;K. Hayashi;T. Ueno;Y. Miyazaki;K. Yubuta
通讯作者: T. Kajitani;M. Kubouchi;S. Kikuchi;K. Hayashi;T. Ueno;Y. Miyazaki;K. Yubuta
DOI: --
发表时间: 2004
期刊:
影响因子: --
作者:
P. Simpson;Z. Jenei;P. Asoka;R. Robison;M. Law
通讯作者: M. Law
DOI: 10.1016/s0031-8914(36)80226-2
发表时间: 1936
期刊:
影响因子: --
作者:
W. Keesom;K. Taconis
通讯作者: K. Taconis