April 7 - 11, 2025
Seattle, Washington
Symposium Supporters
2025 MRS Spring Meeting & Exhibit
QT05.05.04

Atomically Precise Graphene Nanoribbon Transistors with Long-Term Stability and Reliability

When and Where

Apr 9, 2025
4:30pm - 4:45pm
Summit, Level 4, Room 443

Presenter(s)

Co-Author(s)

Muhammed Yusufoglu1,Zafer Mutlu1

The University of Arizona1

Abstract

Muhammed Yusufoglu1,Zafer Mutlu1

The University of Arizona1
Atomically precise graphene nanoribbons (GNRs) synthesized from the bottom-up exhibit promising electronic properties for high-performance field-effect transistors (FETs). The feasibility of fabricating FETs with GNRs (GNRFETs) has been demonstrated, with ongoing efforts aimed at further improving their performance. However, their long-term stability and reliability remain unexplored, which is as important as their performance for practical applications. In this work, we fabricated short-channel FETs with nine-atom-wide armchair GNRs (9-AGNRFETs). We revealed that the on-state (ION) current performance of the 9-AGNRFETs deteriorates significantly over consecutive full transistor on and off logic cycles, which has neither been demonstrated nor previously considered. To address this issue, we deposited a thin ∼10 nm thick atomic layer deposition (ALD) layer of aluminum oxide (Al2O3) directly on these devices. The integrity, compatibility, electrical performance, stability, and reliability, of the GNRFETs before and/or after Al2O3 deposition were comprehensively studied. The results indicate that the observed decline in electrical device performance is most likely due to the degradation of contact resistance over multiple measurement cycles. We successfully demonstrated that the devices with the Al2O3 layer operate well up to several thousand continuous full cycles without any degradation. Our study offers valuable insights into the stability and reliability of GNR transistors, which could facilitate their large-scale integration into practical applications.

Keywords

2D materials | electrical properties | quantum materials

Symposium Organizers

Jun Xiao, University of Wisconsin-Madison
Judy Cha, Cornell University
Xiao-Xiao Zhang, University of Florida
Unai Atxitia Macizo, Consejo Superior de Investigaciones Científicas

Symposium Support

Platinum
Gordon and Betty Moore Foundation

Session Chairs

Ying Wang
Jun Xiao

In this Session