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arXiv 1603.09015cond-mat.mtrl-sci
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低温生长InPBi材料中主要施主的确定

The identification of the dominant donors in low temperature grown InPBi materials

G. N. Wei, D. Xing, Q. Feng, W. G. Luo, Y. Y. Li, K. Wang, L. Y. Zhang, W. W. Pan, S. M. Wang, S. Y. Yang, K. Y. Wang

摘要:

结合磁输运测量和第一性原理计算,我们系统地研究了Bi掺杂对0<x<2.41%的非掺杂InP 1-xBix外延层电学性质的影响。霍尔棒测量揭示了一个占主导地位的n型导电性的InPBi样品。电子浓度随着x的增加先降低,然后随着Bi组分的增加而增加,而电子迁移率则与电子浓度成反比。第一性原理计算表明,这两个磷反位和空位缺陷是占主导地位的施主负责高电子浓度。随着Bi组分x的增加,它们的缺陷浓度表现出不同的行为,导致InPBi合金中电子浓度与Bi组分之间存在非线性关系。

英文摘要:

Combined with magnetotransport measurements and first-principles calculations, we systematically investigated the effects of Bi incorporation on the electrical properties of the undoped InP1-xBix epilayers with 0<x<2.41%. The Hall-bar measurements reveal a dominant n-type conductivity of the InPBi samples. The electron concentrations are found to decrease firstly as x increases up to x=1.83%, and then increase again with further increasing Bi composition, whiles the electron mobility shows an inverse variation to the electron concentration. First-principle calculations suggest that both the phosphorus antisites and vacancy defects are the dominant donors responsible for the high electron concentration. And their defect concentrations show different behaviors as Bi composition x increases, resulting in a nonlinear relationship between electron concentration and Bi composition in InPBi alloys.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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