On-chip synthesis of quasi two-dimensional semimetals from multi-layer chalcogenides

Published

September 23, 2024

Author(s)

Jun Cai, Huairuo Zhang, Yuanqiu Tan, Zheng Sun, Rahul Tripathi, Peng Wu, Sergiy Krylyuk, Caleb Suhy, Jing Kong, Albert Davydov, Zhihong Chen, Joerg Appenzeller

Abstract

Reducing the dimensions of materials from three to two, or quasi-two, provides a fertile platform for exploring emergent quantum phenomena and developing next-generation electronic devices. However, growing high-quality, ultrathin, quasi two-dimensional (2D) materials in a templated fashion on an arbitrary substrate is challenging. Here, we demonstrate a simple and reproducible on-chip approach for synthesizing non-layered, nanometer thick, quasi-2D semimetals. In one implementation, this method starts with thin semiconducting InSe flakes of below 20 nm in thickness with nickel deposited on top, followed by a low-temperature annealing step that results in a controlled conversion of the layered InSe to a non-layered, crystalline semimetal via reaction with the laterally diffusing nickel. Atomic resolution spectroscopy reveals the converted semimetal to be Ni3In2Se2 with a Kagome-lattice structure. Moreover, we show that this synthesis method is generalizable by converting 2D layered chalcogenides such as SnS and SnSe employing Ni and Co to non-layered semimetals, paving the way for engineering novel types of devices.

Citation

Advanced Materials

Volume

36

Pub Type

Journals

Download Paper

https://doi.org/10.1002/adma.202410815

Local Download

Keywords

2D materials, contacts, shandite compounds, solid-state reaction

Citation

Cai, J. , Zhang, H. , Tan, Y. , Sun, Z. , Tripathi, R. , Wu, P. , Krylyuk, S. , Suhy, C. , Kong, J. , Davydov, A. , Chen, Z. and Appenzeller, J. (2024), On-chip synthesis of quasi two-dimensional semimetals from multi-layer chalcogenides, Advanced Materials, [online], https://doi.org/10.1002/adma.202410815, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=958034 (Accessed October 25, 2025)