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arXiv 1502.03748cond-mat.mtrl-sci
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SnS的n型离子置换:几何掺杂作为一种新的掺杂途径

n-type conversion of SnS by isovalent ion substitution: Geometrical doping as a new doping route

Fan-Yong Ran, Zewen Xiao, Yoshitake Toda, Hidenori Hiramatsu, Hideo Hosono, Toshio Kamiya

摘要:

一硫化锡(SnS)是一种天然的具有层状晶体结构的p型半导体,但用传统的异价离子取代法还不能得到可靠的n型SnS。在这项工作中,载流子的极性转换为n型实现了等价离子取代多晶SnS薄膜在玻璃基板上。用Pb 2+取代Sn 2+将多数载流子从空穴转化为电子,自由电子密度范围为1012 ~ 1015 cm-3,最大电子迁移率为7.0 cm 2/(Vs)。基于光电发射光谱和pn异质结的电学特性,通过费米能级(EF)的位置进一步证实了n型导电。密度泛函理论计算表明,Pb取代引起了几何尺寸效应,增大了层间距离,降低了Sn和Pb化合物的形成能。

英文摘要:

Tin monosulfide (SnS) is a naturally p-type semiconductor with a layered crystal structure, but no reliable n-type SnS has been obtained by conventional aliovalent ion substitution. In this work, carrier polarity conversion to n-type was achieved by isovalent ion substitution for polycrystalline SnS thin films on glass substrates. Substituting Pb2+ for Sn2+ converted the majority carrier from hole to electron, and the free electron density ranged from 1012 to 1015 cm-3 with the largest electron mobility of 7.0 cm2/(Vs). The n-type conduction was confirmed further by the position of the Fermi level (EF) based on photoemission spectroscopy and electrical characteristics of pn heterojunctions. Density functional theory calculations reveal that the Pb substitution invokes a geometrical size effect that enlarges the interlayer distance and subsequently reduces the formation energies of Sn and Pb interstitials, which work as electron donors.

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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