One-dimensional (1D) van der Waals (vdW) materials offer nearly defect-free strands as channel material in the field-effect transistor (FET) devices and probably, a better interconnect than conventional copper with higher current density and resistance to electro-migration with sustainable down-scaling. We report a new halide based "truly" 1D few-chain atomic thread, PdBr2, isolable from its bulk which crystallizes in a monoclinic space group C2/c. Liquid phase exfoliated nanowires with mean length (20±1)μm transferred onto SiO2/Si wafer with a maximum aspect ratio of 5000 confirms the lower cleavage energy perpendicular to chain direction. Moreover, an isolated nanowire can also sustain current density of 200 MA/cm2 which is atleast one-order higher than typical copper interconnects. However, local transport measurement via conducting atomic force microscopy (CAFM) tip along the cross direction of the single chain records a much lower current density due to the anisotropic electronic band structure. While 1D nature of the nanoobject can be linked with non-trivial collective quantum behavior, vdW nature could be beneficial for the new pathways in interconnect fabrication strategy with better control of placement in an integrated circuit (IC).
@article{arxiv.2209.03296,
title = {Ultrahigh breakdown current density of van der Waals One Dimensional $\mathrm{PdBr_2}$},
author = {Bikash Das and Kapildeb Dolui and Rahul Paramanik and Tanima Kundu and Sujan Maity and Anudeepa Ghosh and Mainak Palit and Subhadeep Datta},
journal= {arXiv preprint arXiv:2209.03296},
year = {2023}
}