MBE生长的富sc单晶ScGaN具有吸引人的铁电性能

IF 3.6 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2025-07-14 DOI:10.1063/5.0275515

Samuel Yang, Shubham Mondal, Jae Hun Kim, Zetian Mi

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引用次数: 0

摘要

近年来，随着Sc基铁电氮化物的快速和持续发展，有必要探索具有不断增加Sc成分的单晶薄膜，以获得大大增强的铁电、压电和光学性能。由于ScN在GaN中的溶解度比在AlN中的溶解度更高，ScN作为一种自然选择出现。因此，我们报道了单晶相纯ScGaN薄膜在GaN上的MBE生长，其中Sc成分高达48%。详细的表征表明，尽管与氮化镓存在较大的晶格失配，但可以获得较高的表面和晶体质量。观察到的矫顽力场范围为3 ~ 1.2 MV cm−1，是铁电性氮化物中最低的矫顽力场之一。此外，富sc ScGaN的疲劳特性表明，109个双极循环后仍存在非零极化。这些结果突出了富sc铁电氮化物在氮化物平台上利用出色的铁电、压电和光子特性的潜力。

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Sc-rich monocrystalline ScGaN grown by MBE exhibits attractive ferroelectric properties

The rapid and continuous evolution of Sc-based ferroelectric nitrides in recent years has necessitated the exploration of monocrystalline thin films with ever-increasing Sc composition to yield greatly enhanced ferroelectric, piezoelectric, and optical properties. ScGaN presents as a natural choice due to the predicted solubility of ScN being greater in GaN than in AlN. Thus, we report the MBE growth of monocrystalline phase-pure ScGaN films on GaN, with Sc compositions of up to 48%. Detailed characterization reveals that, despite large lattice mismatch with GaN, high surface and crystal quality can be obtained. Coercive fields ranging from 3 to 1.2 MV cm−1, among the lowest reported for ferroelectric nitrides, are observed. Moreover, the fatiguing characteristics of Sc-rich ScGaN show non-zero polarization remaining after 109 bipolar cycles. These results highlight the potential of Sc-rich ferroelectric nitrides to harness outstanding ferroelectric, piezoelectric, and photonic properties all on a nitride platform.

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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.