Probing n-ZnMgO/p-Si nanowire junctions: Insights into composition, strain, and defects via Raman spectroscopy and electrical measurements

IF 5.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds Pub Date : 2024-11-29 DOI:10.1016/j.jallcom.2024.177851

E. Zielony, G. Szalewska, M.A. Pietrzyk

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Abstract

This article focuses on investigating physical properties of n-ZnMgO/p-Si heterojunctions containing ZnMgO nanowires (NWs) with ZnMgO/ZnO/ZnMgO quantum wells (QWs) grown by molecular beam epitaxy. Detailed analysis of chemical composition, crystal lattice strain, and defects in the structures was conducted via Raman spectroscopy, deep level transient spectroscopy (DLTS), and capacitance-versus-temperature characteristics, C(T). Additionally, current-voltage (I-V) curves were included to demonstrate the rectifying properties of the studied n-ZnMgO/p-Si NW junctions. The samples varied in the thicknesses of the ZnO QWs and the ZnMgO barriers. Raman spectra provided information on strain within the crystal lattice of the nanowires. The values of the biaxial in-plane strain were calculated for the selected samples, and the origin of this strain was discussed in detail. A broadened part of spectrum in the range of 480-600 cm^-1 was ascribed to the contribution of

A_{1} (LO)

mode, which is associated with lattice defects such as oxygen vacancies, zinc interstitials, or their complexes. The presence of deep traps in the junctions was revealed by the DLTS method. Measurements of C(T) characteristics of the p-n junctions disclosed the presence of deep-level traps in the structures as well.

Abstract Image

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探测n-ZnMgO/p-Si纳米线结：通过拉曼光谱和电测量对成分，应变和缺陷的见解

本文主要研究了分子束外延生长ZnMgO/ZnO/ZnMgO量子阱中含有ZnMgO纳米线（NWs）的n-ZnMgO/p-Si异质结的物理性质。通过拉曼光谱、深能级瞬态光谱（DLTS）和电容-温度特性（C(T)）对结构中的化学成分、晶格应变和缺陷进行了详细分析。此外，还包括电流-电压（I-V）曲线来证明所研究的n-ZnMgO/p-Si NW结的整流性能。样品的ZnO量子阱和ZnMgO势垒厚度不同。拉曼光谱提供了纳米线晶格内应变的信息。计算了所选试样的双轴面内应变值，并详细讨论了该应变的来源。光谱在480-600 cm-1范围内变宽的部分归因于A1LO模式的贡献，这与晶格缺陷（如氧空位、锌间隙或它们的配合物）有关。DLTS方法揭示了在连接处存在深阱。对p-n结的C(T)特性的测量也揭示了结构中深层圈闭的存在。

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

Journal of Alloys and Compounds 工程技术-材料科学：综合

CiteScore

11.10

自引率

14.50%

发文量

5146

审稿时长

67 days

期刊介绍： The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.