Fabrication of nanopatterned metal layers on silicon by nanoindentation / nanoscratching and electrodeposition

TL;DR

This paper presents a novel maskless method for creating nanopatterned metal layers on silicon using nanoindentation, nanoscratching, and electrodeposition, enabling precise metal pattern fabrication without traditional masks.

Contribution

The work introduces a resistless, maskless technique combining nanomechanical surface modification with electrodeposition to produce nanopatterned metal layers on silicon substrates.

Findings

Successfully fabricated Ni lines 200 nm wide and several microns long.

Demonstrated localized control of metal deposition through microstructure modification.

Enabled patterning without traditional lithography masks.

Abstract

The present work illustrates a novel approach for the maskless and resistless fabrication of nanopatterned metal layers on Si substrates, based on the combination of nanomechanical surface modification techniques (such as nanoindentation and nanoscratching) and electrodeposition. Single crystal (100) n-doped Si substrates were first cleaned from native oxide. Nanoindentation and nanoscratching were then used to locally change the substrate microstructure and create regions with reduced electrical conductivity. The substrates were finally mounted as cathode electrodes in a three electrode electrochemical cell to potentiostatically deposit a Ni layer. Electrodeposition was prevented in regions with modified microstructure, enabling the formation of a patterned Ni layer. The fabrication of several patterns including continuous Ni lines of 200 nm width and several microns length was obtained.