在超时间瞬态纳米显微镜下表征多层MoSe2的纳米尺度时空缺陷

IF 6.6 2区 物理与天体物理 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Hwi Je Woo, Sung-Gyu Lee, Hansung Kim, Suyong Jung, Eun Seong Lee, Junghoon Jahng
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引用次数: 0

摘要

我们直接表征了多层二硒化钼(MoSe2)在真实空间和时间——纳米飞秒尺度上的纳米尺度时空不均匀性,归因于局部机械结构,如应变和表面/亚表面缺陷,这在半导体和光电应用中是至关重要的。这种卓越的精度是通过超时间瞬态纳米显微镜的发展实现的,该技术结合了边带耦合广义锁定放大技术,允许表征亚波长映射区域内每个像素的局部时空缺陷。利用该技术,我们表征了多层MoSe2的纳米尺度应变诱导时空缺陷,包括表现出激子-激子湮灭率显著降低的纳米气泡,这可能归因于由于应变诱导的能带畸变而抑制了激子双分子相互作用的概率。此外,我们还可视化了地形上隐藏的时空缺陷,如晶格不匹配,这些缺陷会诱导捕获载流子的中隙状态,从而减缓复合过程。我们提出,这种解决范德华材料复杂时空不均匀性的超时间方法为其光电特性提供了重要见解,并为创新材料设计和表征开辟了新的途径。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Characterizing nanoscale spatiotemporal defects of multi-layered MoSe2 in hyper-temporal transient nanoscopy
We directly characterize nanoscale spatiotemporal inhomogeneities of multi-layered molybdenum diselenide (MoSe2) in real space and time – the nanometre–femtosecond scale, attributing to local mechanical structures such as strain and surface/subsurface defects, which are critical in semiconductor and optoelectronic applications. This remarkable precision is achieved through the development of a hyper-temporal transient nanoscopy incorporating a sideband-coupled generalized lock-in amplification technique, allowing for characterization of local spatiotemporal defects at each pixel within a subwavelength mapping region. By utilizing this technique, we characterize the nanoscale strain-induced spatiotemporal defects of multi-layered MoSe2, including nano-bubbles that exhibit a noticeable reduction in exciton-exciton annihilation rates, which may attribute to the suppressed probability of bimolecular interaction of excitons due to the strain-induced band distortion. Moreover, we visualize topographically hidden spatiotemporal defects such as lattice mismatches, which induce mid-gap states that traps charge carriers and thereby slow down recombination process. We propose that this hyper-temporal approach to resolving intricate spatiotemporal inhomogeneities in van der Waals materials provides significant insights into their optoelectronic properties and opens new avenues for innovative material design and characterization.
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来源期刊
Nanophotonics
Nanophotonics NANOSCIENCE & NANOTECHNOLOGY-MATERIALS SCIENCE, MULTIDISCIPLINARY
CiteScore
13.50
自引率
6.70%
发文量
358
审稿时长
7 weeks
期刊介绍: Nanophotonics, published in collaboration with Sciencewise, is a prestigious journal that showcases recent international research results, notable advancements in the field, and innovative applications. It is regarded as one of the leading publications in the realm of nanophotonics and encompasses a range of article types including research articles, selectively invited reviews, letters, and perspectives. The journal specifically delves into the study of photon interaction with nano-structures, such as carbon nano-tubes, nano metal particles, nano crystals, semiconductor nano dots, photonic crystals, tissue, and DNA. It offers comprehensive coverage of the most up-to-date discoveries, making it an essential resource for physicists, engineers, and material scientists.
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