Reactivity-Guided Janus Graphene With Asymmetric Interfacial Electrostatics for Tunable Charge Transport.

Authors

Shishi Liu, Zhuting Hao, Mira Kreßler, Oguzhan Yücel, Lotte Polling, Adrián Dewambrechies, Wesley Pietsch, Philip Nickl, Felix Fels, Kevin Pagel, Markus R Heinrich, Patryk Kusch, Kirill Bolotin, Xin Chen, Siegfried Eigler

Published in

Advanced materials (Deerfield Beach, Fla.). Pages e75239. Oct 06, 2026. Epub Oct 06, 2026.

Abstract

Breaking out-of-plane symmetry in graphene is essential to realize electrostatic control in next-generation electronic devices. While Janus graphene, which bears chemically distinct top and bottom faces, is a promising architecture, establishing a controllable fabrication route and directly linking asymmetric chemistry to electronic transport remains challenging. In this study, we present a resist-free, interface-selective laser-writing strategy that facilitates stepwise bottom-to-top covalent functionalization of graphene and enables controlled access to top-, bottom-, and asymmetric dual-side configurations. Raman spectroscopy verifies that this Janus configuration reaches a substantial degree of functionalization, exhibiting a Raman-derived defect distance (L_D) of approximately 1.5 nm. Kelvin probe force microscopy reveals configuration-dependent electrostatic responses, with a change of contact potential difference of approximately 225 mV for Janus graphene. Back-gated field-effect transistors further reveal pronounced changes in charge transport, with the residual carrier density increasing to 5.92 × 10¹² cm^-2 in Janus graphene. Notably, comparison of the investigated configurations reveals a configuration-dependent relationship between interfacial electrostatics and charge transport. Furthermore, lithographically pre-patterned substrates enable spatially programmable Janus architectures via single-step laser writing, providing a scalable platform for engineering symmetry-broken two-dimensional electronic materials.

PMID:
42839713
Bibliographic data and abstract were imported from PubMed on 07 Oct 2026.

Read full publication at:
Please sign in to see all details.

Stats

1-terrible, 9-excellent. How would you rate this publication? Sign in in to submit your rating.

Post a comment

You need to be signed in to post comments. You can sign in here.

Comments

There are no comments yet.