journal article·2023-05-09Open access

Tuning the Sharing Modes and Composition in a Tetrahedral GeX2 (X = S, Se) System via One-Dimensional Confinement

Yangjin Lee, Young Woo Choi, Kihyun Lee, Chengyu Song, Peter Ercius, Marvin L. Cohen, Kwanpyo Kim, Alex Zettl

ACS Nano· Volume 17· Issue 9

Abstract

High Resolution Image Download MS PowerPoint Slide The packing and connectivity of tetrahedral units are central themes in the structural and electronic properties of a host of solids. Here, we report one-dimensional (1D) chains of GeX 2 (X = S or Se) with modification of the tetrahedral connectivity at the single-chain limit. Precise tuning of the edge- and corner-sharing modes between GeX 2 blocks is achieved by diameter-dependent 1D confinement inside a carbon nanotube. Atomic-resolution scanning transmission electron microscopy directly confirms the existence of two distinct types of GeX 2 chains. Density functional theory calculations corroborate the diameter-dependent stability of the system and reveal an intriguing electronic structure that sensitively depends on tetrahedral connectivity and composition. GeS 2(1– x ) Se 2 x compound chains are also realized, which demonstrate the tunability of the system’s semiconducting properties through composition engineering.
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Research context

OpenAlex topics: 2D Materials and Applications · Graphene research and applications · Quantum Dots Synthesis And Properties

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Affiliations

Department of Physics, University of California at Berkeley, Berkeley, California 94720, United States

Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States

Department of Physics, Yonsei University, Seoul 03722, Korea

Center for Nanomedicine, Institute for Basic Science, Seoul 03722, Korea

National Center for Electron Microscopy, The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States

Kavli Energy NanoSciences Institute at the University of California at Berkeley, Berkeley, California 94720, United States

Funding

National Research Foundation of Korea · Institute for Basic Science · U.S. Department of Energy · Yonsei University

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