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arXiv 1406.0872cond-mat.mtrl-sci
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一种新型全金属重元素Half-Heusler透明空穴导体的设计与发现

Design and discovery of a novel Half-Heusler transparent hole conductor made of all-metallic heavy elements

Feng Yan, Xiuwen Zhang, Yonggang Yu, Liping Yu, Arpun Nagaraja, Thomas O. Mason, Alex Zunger

摘要:

光学透明的金属导体代表了一种罕见的通常禁忌的物理性质,然而对于两种功能都至关重要的应用来说,它们是非常需要的。传统上,这种稀有材料是在含有金属氧化物的化合物的一般化学邻域中寻找的,这些金属氧化物被认为是宽禁带绝缘体,可能被掺杂以诱导导电性。聚焦于18价电子ABX化合物家族,我们从理论上寻找了化合物的电子结构同时导致光学透明的能力,这导致了一种稳定的、以前从未合成过的、由全金属重原子化合物制成的TaIrGe化合物的预测,该化合物是V-IX-IV组中的“最佳类别”。然后实验室合成发现它在预测的晶体结构和p型透明导体中是稳定的,在室温下测量到3.36 eV的强直接吸收和2730 cm 2/Vs的显著高(尽管不是预测的)空穴迁移率。这种方法为未来在意想不到的化学基团中搜索透明导体开辟了道路。

英文摘要:

Metallic conductors that are optically transparent represent a rare breed of generally contraindicated physical properties that are nevertheless critically needed for application where both functionalities are crucial. Such rare materials have traditionally been searched in the general chemical neighborhood of compounds containing metal oxides, expected to be wide gap insulators that might be doped to induce conductivity.Focusing on the family of 18 valence electron ABX compounds we have searched theoretically for the ability of the compound's electronic structure to simultaneously lead to optical transparency, in parallel with the ability of its intrinsic defect structures to produce uncompensated free holes.This led to the prediction of a stable, never before synthesized TaIrGe compound made of all-metal heavy atom compound as the "best of class" from the V-IX-IV group. Laboratory synthesis then found it to be stable in the predicted crystal structure and p-type transparent conductor with measured strong direct absorption of 3.36 eV and remarkably high (albeit not predicted) hole mobility of 2730 cm2/Vs at room temperature. This methodology opens the way to future searches of transparent conductors in unexpected chemical groups.

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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