Photoreflectance spectroscopy of BiOCl epitaxial thin films

IF 1.5 4区物理与天体物理 Q3 PHYSICS, APPLIED

Japanese Journal of Applied Physics Pub Date : 2023-12-28 DOI:10.35848/1347-4065/ad0306

T. Nishiwaki, Z. Sun, D. Oka, T. Fukumura, T. Makino

引用次数: 0

Abstract

We have observed a new optical transition in the photoreflectance spectra of indirect-gap BiOCl thin films, which were grown on SrTiO₃ substrates. The position of this transition is close in energy to its bulk critical point (CP) energy. Moreover, these are significantly lower than a higher-lying direct-type CP from an energetic point of view. The spectral line shape analysis for our observed signal suggests the presence of an excitonic effect of this compound. We determined its dependence of the optical anomaly on temperature ranging from 80 K to RT. We adopted the Varshni model for this analysis. At last, we compared photonic properties of BiOCl with those of an element and binary semiconductors.

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生物OCl 外延薄膜的光反射光谱学

我们在间接隙 BiOCl 薄膜的光反射光谱中观察到了一个新的光学转变，该薄膜是在钛酸锶（SrTiO3）基底上生长的。该转变的能量位置接近其主体临界点（CP）能量。此外，从能量的角度来看，它们明显低于更高的直接型临界点。对我们观测到的信号进行的光谱线形分析表明，这种化合物存在激子效应。我们确定了光学异常与温度的关系，温度范围从 80 K 到 RT。我们采用了 Varshni 模型进行分析。最后，我们将 BiOCl 的光子特性与元素和二元半导体的光子特性进行了比较。

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

Japanese Journal of Applied Physics 物理-物理：应用

CiteScore

3.00

自引率

26.70%

发文量

818

审稿时长

3.5 months

期刊介绍： The Japanese Journal of Applied Physics (JJAP) is an international journal for the advancement and dissemination of knowledge in all fields of applied physics. JJAP is a sister journal of the Applied Physics Express (APEX) and is published by IOP Publishing Ltd on behalf of the Japan Society of Applied Physics (JSAP). JJAP publishes articles that significantly contribute to the advancements in the applications of physical principles as well as in the understanding of physics in view of particular applications in mind. Subjects covered by JJAP include the following fields: • Semiconductors, dielectrics, and organic materials • Photonics, quantum electronics, optics, and spectroscopy • Spintronics, superconductivity, and strongly correlated materials • Device physics including quantum information processing • Physics-based circuits and systems • Nanoscale science and technology • Crystal growth, surfaces, interfaces, thin films, and bulk materials • Plasmas, applied atomic and molecular physics, and applied nuclear physics • Device processing, fabrication and measurement technologies, and instrumentation • Cross-disciplinary areas such as bioelectronics/photonics, biosensing, environmental/energy technologies, and MEMS