From localization to quantum-dot chains in self-formed core–shell InGaN nanowires emitting in the red

IF 3.5 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2025-01-21 DOI:10.1063/5.0252308

Rongli Deng, Haibin Lin, Qichuan Hu, Dan Wang, Bo Wu, Richard Nötzel

引用次数: 0

Abstract

Self-formed core–shell InGaN nanowires (NWs) grown by plasma-assisted molecular beam epitaxy on p-Si (111) are studied by temperature-dependent and time-resolved photoluminescence (PL) spectroscopy. Clear localization and associated photocarrier redistribution can be evidenced by the S-shape temperature dependence of the PL peak energy and inflection of the PL linewidth. An unexpected maximum of the integrated PL intensity as a function of temperature is observed. This maximum is identified as proof that the localized states behave as chains of quantum dots with reduced radiative lifetime due to the combination of strong two-dimensional lateral quantum confinement in the NW core with localization. This is underlined by the time-resolved PL measurements exhibiting a fast, sub-ns, single-exponential decay, in addition evidencing negligible quantum-confined Stark effect for efficient light sources emitting in the red.

查看原文本刊更多论文

从定位到自形成核壳InGaN纳米线中的量子点链，发出红光

利用温度依赖性和时间分辨光致发光（PL）光谱研究了等离子体辅助分子束外延在p-Si（111）上生长的自形成核壳InGaN纳米线（NWs）。清晰的定位和相关的光载流子再分布可以通过PL峰能量的s形温度依赖性和PL线宽的弯曲来证明。观测到一个意想不到的最大值的综合PL强度作为温度的函数。这个最大值被认为是局域态表现为量子点链的证据，由于NW核心中强二维横向量子限制与局域化的结合而降低了辐射寿命。这一点在时间分辨PL测量中得到了强调，它显示出一个快速的、亚ns级的单指数衰减，此外，对于发射红光的高效光源来说，量子受限的斯塔克效应可以忽略不计。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

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.