The band structure and carrier recombination mechanism of α/β-phase tellurium homojunction investigated by infrared photoluminescence

IF 3.5 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2025-01-14 DOI:10.1063/5.0245121

Xiaoyun Ye, Liangqing Zhu, Jun Shao, Rui Hu, Liyan Shang, Xiren Chen, Yawei Li, Jinzhong Zhang, Kai Jiang, Junhao Chu, Zhigao Hu

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引用次数: 0

Abstract

During the synthesis of tellurium (Te) crystals, the coexistence of multiple crystalline phases (α-Te, β-Te, and γ-Te) with diverse structures commonly occurs, leading to instability and complexity in the performance of Te-based optoelectronic devices. This study employs physical vapor deposition to synthesize Te crystals of various sizes and morphologies, followed by spatially and temperature-dependent evaluation using Raman mapping and infrared photoluminescence (PL) spectroscopy. Spatially resolved results reveal that the size and morphology of Te crystals significantly influence the energy and peak profiles of Raman and PL spectra. Statistical analysis of spatially random sampling indicates the PL peak energies of Te crystals follow a lognormal distribution in terms of their occurrence frequencies, reflecting the complex interplay of multiple factors during crystal growth. This results in the coexistence of α-Te and β-Te phases, forming α/β-Te heterophase homojunction (HPHJ). Meanwhile, temperature-dependent PL results, obtained for the range of 3–290 K, reveal multi-peak competitive behavior in the PL spectra, accompanied by S-shaped shifts in peak energy. These features can be rationally explained by an interface transition-recombination mechanism based on the I-type α/β-Te HPHJ model. It also confirms infrared PL spectroscopy is an effective method for identifying the crystalline phase composition of Te crystals.

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红外光致发光研究了α/β相碲同结的能带结构和载流子复合机理

在碲（Te）晶体的合成过程中，经常会出现不同结构的多个晶相（α-Te、β-Te和γ-Te）共存的情况，这导致了碲基光电器件性能的不稳定性和复杂性。本研究采用物理气相沉积方法合成了不同尺寸和形态的Te晶体，然后利用拉曼映射和红外光致发光（PL）光谱对其进行了空间和温度依赖的评价。空间分辨结果表明，Te晶体的尺寸和形貌对拉曼光谱和PL光谱的能量和峰分布有显著影响。空间随机采样的统计分析表明，Te晶体的PL峰值能量在出现频率上服从对数正态分布，反映了晶体生长过程中多种因素的复杂相互作用。这导致α- te相和β-Te相共存，形成α/β-Te异相同质结（HPHJ）。与此同时，在3-290 K范围内获得的温度相关的PL结果显示，PL光谱中存在多峰竞争行为，伴随着峰值能量的s形位移。这些特征可以用基于i型α/β- HPHJ模型的界面过渡-重组机制来合理解释。验证了红外PL光谱法是鉴定Te晶体相组成的有效方法。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.