Optical response of WSe2-based vertical tunneling junction

IF 2.1 4区物理与天体物理 Q3 PHYSICS, CONDENSED MATTER

Solid State Communications Pub Date : 2024-11-24 DOI:10.1016/j.ssc.2024.115756

K. Walczyk , G. Krasucki , K. Olkowska-Pucko , Z. Chen , T. Taniguchi , K. Watanabe , A. Babiński , M. Koperski , M.R. Molas , N. Zawadzka

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引用次数: 0

Abstract

Layered materials have attracted significant interest because of their unique properties. Van der Waals heterostructures based on transition-metal dichalcogenides have been extensively studied because of potential optoelectronic applications. We investigate the optical response of a light-emitting tunneling structure based on a WSe₂ monolayer as an active emission material using the photoluminescence (PL) and electroluminescence (EL) experiments performed at low temperature of 5 K. We found that the application of the bias voltage allows us to change both a sign and a value of free carriers concentrations. Consequently, we address the several excitonic complexes emerging in PL spectra under applied bias voltage. The EL signal was also detected and ascribed to the emission in a high-carrier-concentration regime. The results show that the excitation mechanisms in the PL and EL are different, resulting in various emissions in both types of experimental techniques.

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基于 WSe2 的垂直隧道结的光学响应

层状材料因其独特的性能而备受关注。基于过渡金属二卤化物的范德华异质结构具有潜在的光电应用前景，因此受到了广泛的研究。我们利用在 5 K 低温条件下进行的光致发光（PL）和电致发光（EL）实验，研究了基于 WSe2 单层作为活性发射材料的发光隧道结构的光学响应。因此，我们解决了在施加偏置电压的情况下，PL 光谱中出现的几种激子复合物的问题。我们还检测到了 EL 信号，并将其归因于高载流子浓度机制下的发射。结果表明，聚光和电致发光的激发机制不同，从而导致这两种实验技术产生了不同的发射。

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

Solid State Communications 物理-物理：凝聚态物理

CiteScore

3.40

自引率

4.80%

发文量

287

审稿时长

51 days

期刊介绍： Solid State Communications is an international medium for the publication of short communications and original research articles on significant developments in condensed matter science, giving scientists immediate access to important, recently completed work. The journal publishes original experimental and theoretical research on the physical and chemical properties of solids and other condensed systems and also on their preparation. The submission of manuscripts reporting research on the basic physics of materials science and devices, as well as of state-of-the-art microstructures and nanostructures, is encouraged. A coherent quantitative treatment emphasizing new physics is expected rather than a simple accumulation of experimental data. Consistent with these aims, the short communications should be kept concise and short, usually not longer than six printed pages. The number of figures and tables should also be kept to a minimum. Solid State Communications now also welcomes original research articles without length restrictions. The Fast-Track section of Solid State Communications is the venue for very rapid publication of short communications on significant developments in condensed matter science. The goal is to offer the broad condensed matter community quick and immediate access to publish recently completed papers in research areas that are rapidly evolving and in which there are developments with great potential impact.