外延生长氮化镓表面液态镓有序化的温度依赖性

IF 2.3 4区物理与天体物理 Q3 PHYSICS, APPLIED

Applied Physics Express Pub Date : 2024-02-20 DOI:10.35848/1882-0786/ad237b

Takuo Sasaki, Takuya Iwata, Kanya Sugitani, Takahiro Kawamura, Toru Akiyama and Masamitu Takahasi

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引用次数: 0

摘要

在 MBE 条件下，利用原位 X 射线散射探测了 GaN（0001）和（000 ）表面镓（Ga）叠层的三维有序性。在氮化镓（0001）上形成了有序的双层镓，但在衬底温度<450 ℃时有序性降低，这与非平衡外延生长的机制一致。在氮化镓（000 ）上形成的单层镓是横向无序的，并且与温度无关，同时还有过量的镓滴。第一原理分子动力学计算证实了每个镓层的垂直和横向 B 因子。

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Temperature dependence of liquid-gallium ordering on the surface of epitaxially grown GaN

The three-dimensional ordering of the gallium (Ga) adlayers on GaN(0001) and (000 ) surfaces was probed using in situ X-ray scattering under MBE conditions. An ordered bilayer of Ga forms on GaN(0001) but the ordering decreases at substrate temperatures of <450 °C, consistent with the mechanism of non-equilibrium epitaxial growth. Monolayer Ga that forms on GaN(000 ) is laterally disordered and has no temperature dependence, along with droplets of excess Ga. The vertical and lateral B-factors for each Ga layer were confirmed using first-principles molecular dynamics calculations.

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来源期刊

Applied Physics Express 物理-物理：应用

CiteScore

4.80

自引率

8.70%

发文量

310

审稿时长

1.2 months

期刊介绍： Applied Physics Express (APEX) is a letters journal devoted solely to rapid dissemination of up-to-date and concise reports on new findings in applied physics. The motto of APEX is high scientific quality and prompt publication. APEX is a sister journal of the Japanese Journal of Applied Physics (JJAP) and is published by IOP Publishing Ltd on behalf of the Japan Society of Applied Physics (JSAP).