揭示 Janus MoSSe 和 Janus 合金 MoS2(1-x)Se2x 中缺陷的影响

IF 9.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

npj 2D Materials and Applications Pub Date : 2024-10-11 DOI:10.1038/s41699-024-00504-6

Jennifer Schmeink, Jens Osterfeld, Osamah Kharsah, Stephan Sleziona, Marika Schleberger

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引用次数: 0

摘要

我们通过综合分析研究了 Janus MoSSe 和 Janus 合金 MoS2(1-x)Se2x 中结构缺陷和置换缺陷的影响。不同的拉曼特征与各种缺陷类型和密度有关，反映了从 MoSe2 到 Janus 合金再到理想 Janus MoSSe 的演变过程。通过相应的化学计量和结构变化，带隙可在室温下从 1.50 eV 调整到 1.68 eV。场效应器件中的电特性分析揭示了缺陷对电导率、迁移率（高达 2.42 × 10-3 cm2 V-1 s-1）和阈值电压的影响。与 Janus 合金相比，Janus MoSSe 的 n 型掺杂减少了 5.3 × 1011 cm-2，这表明功函数增加，缺陷减少。我们的发现加深了对二维 Janus 材料中缺陷物理学的理解，并为先进（光）电子应用中量身定制的缺陷工程策略铺平了道路。

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Unraveling the influence of defects in Janus MoSSe and Janus alloys MoS2(1−x)Se2x

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Unraveling the influence of defects in Janus MoSSe and Janus alloys MoS2(1−x)Se2x

We investigate the effect of structural and substitutional defects in Janus MoSSe and the Janus alloys MoS2(1−x)Se2x by a comprehensive analysis. Distinct Raman signatures are associated with various defect types and densities, mirroring the evolution from MoSe2 to Janus alloys to ideal Janus MoSSe. By the corresponding stoichiometrical and structural changes, the band gap can be tuned from 1.50 eV up to 1.68 eV at room temperature. Electrical characterization in a field effect device uncovers the impact of defects on conductivity, mobility (up to 2.42 × 10−3 cm2 V−1 s−1), and threshold voltages. A decrease of n-type doping of 5.3 × 1011 cm−2 in Janus MoSSe compared to the Janus alloy points towards an increased work function and a reduction of defects. Our findings deepen the understanding of defect physics in 2D Janus materials and pave the way for tailored defect engineering strategies for advanced (opto-)electronic applications.

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来源期刊

npj 2D Materials and Applications Engineering-Mechanics of Materials

CiteScore

14.50

自引率

2.10%

发文量

审稿时长

15 weeks

期刊介绍： npj 2D Materials and Applications publishes papers on the fundamental behavior, synthesis, properties and applications of existing and emerging 2D materials. By selecting papers with the potential for impact, the journal aims to facilitate the transfer of the research of 2D materials into wide-ranging applications.