Photoluminescence efficiency of MBE-grown MoSe2 monolayers featuring narrow excitonic lines and diverse grain structures

IF 3.6 3区物理与天体物理 Q2 OPTICS

Journal of Luminescence Pub Date : 2025-09-30 DOI:10.1016/j.jlumin.2025.121576

Mateusz Raczyński , Julia Kucharek , Kacper Oreszczuk , Aleksander Rodek , Tomasz Kazimierczuk , Rafał Bożek , Takashi Taniguchi , Kenji Watanabe , Wojciech Pacuski , Piotr Kossacki

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引用次数: 0

Abstract

Recent studies have demonstrated that using hexagonal boron nitride (h-BN) as a substrate for the growth of transition metal dichalcogenides can significantly reduce excitonic linewidths. However, many other optical parameters still require optimization. In this work, we present a detailed study of the low-temperature photoluminescence efficiency of MBE-grown MoSe₂ monolayers on h-BN substrates, comparing them to state-of-the-art exfoliated monolayers encapsulated in h-BN. We demonstrate that a quantitative comparison between samples requires accounting for interference effects and Purcell enhancement or suppression of the emission. By accounting for these effects in both photoluminescence and Raman signals, we show that the overall intrinsic luminescence efficiency is proportional to the sample coverage. Consequently, we find that exciton diffusion and edge effects are not visibly affecting the spectroscopic properties of MBE-grown samples, even for nanometer-sized crystals.

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具有窄激子线和不同晶粒结构的mbe生长MoSe2单层膜的光致发光效率

最近的研究表明，使用六方氮化硼（h-BN）作为过渡金属二硫族化合物生长的衬底可以显着减少激子线宽。然而，许多其他光学参数仍需要优化。在这项工作中，我们详细研究了mbe在h-BN衬底上生长的MoSe2单层膜的低温光致发光效率，并将它们与h-BN封装的最先进的剥离单层膜进行了比较。我们证明了样品之间的定量比较需要考虑干扰效应和珀塞尔增强或抑制发射。通过考虑光致发光和拉曼信号中的这些效应，我们发现整体的固有发光效率与样品覆盖率成正比。因此，我们发现激子扩散和边缘效应对mbe生长样品的光谱特性没有明显的影响，即使是纳米尺寸的晶体。

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 Luminescence 物理-光学

CiteScore

6.70

自引率

13.90%

发文量

850

审稿时长

3.8 months

期刊介绍： The purpose of the Journal of Luminescence is to provide a means of communication between scientists in different disciplines who share a common interest in the electronic excited states of molecular, ionic and covalent systems, whether crystalline, amorphous, or liquid. We invite original papers and reviews on such subjects as: exciton and polariton dynamics, dynamics of localized excited states, energy and charge transport in ordered and disordered systems, radiative and non-radiative recombination, relaxation processes, vibronic interactions in electronic excited states, photochemistry in condensed systems, excited state resonance, double resonance, spin dynamics, selective excitation spectroscopy, hole burning, coherent processes in excited states, (e.g. coherent optical transients, photon echoes, transient gratings), multiphoton processes, optical bistability, photochromism, and new techniques for the study of excited states. This list is not intended to be exhaustive. Papers in the traditional areas of optical spectroscopy (absorption, MCD, luminescence, Raman scattering) are welcome. Papers on applications (phosphors, scintillators, electro- and cathodo-luminescence, radiography, bioimaging, solar energy, energy conversion, etc.) are also welcome if they present results of scientific, rather than only technological interest. However, papers containing purely theoretical results, not related to phenomena in the excited states, as well as papers using luminescence spectroscopy to perform routine analytical chemistry or biochemistry procedures, are outside the scope of the journal. Some exceptions will be possible at the discretion of the editors.