关于 TiO2 (001) 基质上金红石型 GeO2 薄膜的透射电子显微镜研究

IF 3.5 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2024-11-18 DOI:10.1063/5.0236711

Hitoshi Takane, Shinya Konishi, Ryo Ota, Yuichiro Hayasaka, Takeru Wakamatsu, Yuki Isobe, Kentaro Kaneko, Katsuhisa Tanaka

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引用次数: 0

摘要

金红石型二氧化 GeO2（r-GeO2）具有∼4.7 eV 的超宽带隙，已成为下一代功率电子和光电器件的一种有前途的材料。我们利用透射电子显微镜（TEM）观察分析了 r-TiO2 (001) 衬底上的 r-GeO2 薄膜的原子级结构特性。双束 TEM 显示，r-GeO2 薄膜的穿线位错密度为 3.6 × 109 cm-2，薄膜中存在边缘型、螺旋型和混合型位错。边缘型位错的布尔矢量为 [100] 和/或 [110]。通过电子能量损失光谱测定，r-GeO2 薄膜的带隙为 4.74 ± 0.01 eV。

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Transmission electron microscopic study on rutile-type GeO2 film on TiO2 (001) substrate

Rutile-type GeO2 (r-GeO2) with an ultrawide bandgap of ∼4.7 eV has emerged as a promising material for next-generation power-electronic and optoelectronic devices. We performed transmission electron microscopy (TEM) observation to analyze the structural properties of r-GeO2 film on r-TiO2 (001) substrate at an atomic level. The r-GeO2 film exhibits a threading dislocation density of 3.6 × 109 cm−2 and there exist edge-, screw-, and mixed-type dislocations in the film as demonstrated by two-beam TEM. The edge-type dislocations have Burgers vectors of [100] and/or [110]. The bandgap of the r-GeO2 film is 4.74 ± 0.01 eV as determined by electron energy loss spectroscopy.

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来源期刊

Applied Physics Letters 物理-物理：应用

CiteScore

6.40

自引率

10.00%

发文量

1821

审稿时长

1.6 months

期刊介绍： Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology. In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics. APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field. Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.