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arXiv 2602.23138cond-mat.mtrl-scicond-mat.mes-hall
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通过表面结合配体工程二维材料的平面各向异性

Engineering in-plane anisotropy in 2D materials via surface-bound ligands

Massachusetts Institute of Technology(麻省理工学院);Institute of Science Tokyo(东京科学大学);AGC Inc.(AGC株式会社);Vidyasirimedhi Institute of Science and Technology (VISTEC)(维拉亚梅迪科学与技术学院)
Tomoaki Sakurada, Woo Seok Lee, Yeongsu Cho, Rattapon Khamlue, Petcharaphorn Chatsiri, Nicholas Samulewicz, Tejas Deshpande, Annlin Su, Peter Müller, Tadashi Ka… 展开作者

Tomoaki Sakurada, Woo Seok Lee, Yeongsu Cho, Rattapon Khamlue, Petcharaphorn Chatsiri, Nicholas Samulewicz, Tejas Deshpande, Annlin Su, Peter Müller, Tadashi Kawamoto, Shun Omagari, Martin Vacha, Watcharaphol Paritmongkol, Heather J. Kulik, William A. Tisdale

AI总结:

通过表面结合配体工程二维材料的平面各向异性,实现混合半导体的光电性质调控,为先进材料设计提供新途径。

摘要:

二维材料表现出平面各向异性,使电子、光电和光子器件具有新功能,但其通常局限于自然存在的低对称性范德华化合物。在此,我们展示了一种方法,通过表面结合有机分子配体之间的立体相互作用,在一系列蓝色发光二维银苯基硫化物半导体中进行结构工程。通过有策略地卤化苯基配体的特定位置,我们展示了对有机AgSe平面在mithrene(银苯基硒酸盐,AgSePh)中的显著变化。密度泛函理论揭示了直接隙氟化衍生物中明显的平面电子各向异性,而氯化变种则表现出直接到间接带隙转变。此外,一些氟化变种显示出强烈极化的吸收和发光,并伴有光致发光量子产率的10倍增强。这项工作建立了一种灵活的方法,用于在混合半导体中调节光电性质,这种性质在单一无机材料中难以或不可能实现,为先进材料设计提供了新的机会。

英文摘要:

2D materials exhibiting in-plane anisotropy enable novel functionality in electronic, optoelectronic, and photonic devices, yet their availability is generally limited to naturally-occurring low-symmetry van der Waals compounds. Here, we demonstrate an approach to structural engineering in a family of blue-emitting 2D silver phenylchalcogenide semiconductors based on steric interactions among surface-bound organic molecular ligands. By strategically halogenating specific sites of phenyl ligands, we demonstrate dramatic changes to the inorganic AgSe plane in mithrene (silver phenylselenolate, AgSePh). Density functional theory revealed pronounced in-plane electronic anisotropy for direct-gap fluorinated derivatives, while a chlorinated variant exhibited a direct-to-indirect bandgap transition. Furthermore, some fluorinated variants displayed strongly polarized absorption and luminescence, accompanied by a 10x enhancement in photoluminescence quantum yield. This work establishes a versatile approach for tailoring optoelectronic properties in hybrid semiconductors that is difficult or impossible to achieve in all-inorganic materials alone, offering new opportunities in advanced material design.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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