Laser scribing on HOPG for graphene stamp printing on silicon wafer

TL;DR

This paper introduces a laser scribing method on HOPG to produce graphene stamps for printing onto silicon wafers, offering a simpler and more flexible alternative for microelectronics fabrication.

Contribution

It presents a novel laser scribing technique on HOPG for creating graphene stamps and compares direct and glue-assisted printing methods, demonstrating improved flexibility and ease of implementation.

Findings

Glue-assisted printing yields larger graphene sheets (40x40 microns).

Laser scribing enables precise patterning of HOPG for graphene transfer.

The method is easier and more adaptable than existing techniques.

Abstract

Highly oriented pyrolytic graphite (HOPG) was scribed by pulsed laser beam to produce square patterns. Patterning of HOPG surface facilitates the detachment of graphene layers during contact printing. Direct HOPG-to-substrate and glue-assisted stamp printing of a few-layers graphene was compared. Printed graphene sheets were visualized by optical and scanning electron microscopy. The number of graphene layers was measured by atomic force microscopy. Glue-assisted stamp printing allows printing relatively large graphene sheets (40x40 microns) onto a silicon wafer, which can be important for microelectronics fabrication. The presented method is easier to implement and is more flexible than the majority of existing ways of placing graphene sheets onto a substrate.