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arXiv 2009.02142physics.app-ph
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三族氮化物异质结构纳米线的极化和空间电荷限制电流

Polarization and Space Charge Limited Current in III-Nitride Heterostructure Nanowires

Michael A. Mastro, Hong-Youl Kim, Jaehui Ahn, Blake Simpkins, Pehr Pehrsson, Jihyun Kim, Jennifer K. Hite, Charles R. Eddy

摘要:

未掺杂的AlGaN/GAN纳米线表现出p型导电性,其仅基于空穴载流子响应于(000-1)AlGaN/GAN面处的负极化场的形成。基于该纳米线的晶体管显示出从欧姆到空间电荷限制传导的低电压转变。数值模拟表明,在三角形截面上存在着高度非对称的应变,在(000-1)面处的压电激发极化电荷中产生了双峰。此外,在(000-1)AlGaN/GAN界面处的电荷与来自三个表面的耗尽之间存在强烈的相互作用,以及与两个半极性{-110-1}面处的相反极化场的相互作用。的电荷分布和所得的导电制度是高度依赖于配置的多层结构,是不服从的分析模型。

英文摘要:

An undoped AlGaN/GaN nanowire demonstrated p-type conductivity based solely on the formation of hole carriers in response to the negative polarization field at the (000-1) AlGaN/GaN facet. A transistor based on this nanowire displayed a low-voltage transition from Ohmic to space charge limited conduction. A numerical simulation showed that a highly asymmetric strain exists across the triangular cross-section, which creates a doublet peak in the piezoelectric induced polarization sheet charge at the (000-1) facet. Additionally, there is a strong interplay between the charge at the (000-1) AlGaN/GaN interface with depletion from the three surfaces as well as an interaction with the opposing polarization fields at two semi-polar {-110-1} facets. The charge distribution and resultant conduction regime is highly interdependent on configuration of the multi-layer structure, and is not amenable to an analytical model.

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