Dynamic Memory Cells Using MoS2 Field-Effect Transistors Demonstrating Femtoampere Leakage Currents

Chaitanya U. Kshirsagar, Weichao Xu, Yang Su, Matthew C. Robbins, Chris H. Kim, Steven J. Koester

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

Two-dimensional semiconductors such as transition-metal dichalcogenides (TMDs) are of tremendous interest for scaled logic and memory applications. One of the most promising TMDs for scaled transistors is molybdenum disulfide (MoS2), and several recent reports have shown excellent performance and scalability for MoS2 MOSFETs. An often overlooked feature of MoS2 is that its wide band gap (1.8 eV in monolayer) and high effective masses should lead to extremely low off-state leakage currents. These features could be extremely important for dynamic memory applications where the refresh rate is the primary factor affecting the power consumption. Theoretical predictions suggest that leakage currents in the 10-18 to 10-15 A/μm range could be possible, even in scaled transistor geometries. Here, we demonstrate the operation of one- and two-transistor dynamic memory circuits using MoS2 MOSFETs. We characterize the retention times in these circuits and show that the two-transistor memory cell reveals MoS2 MOSFETs leakage currents as low as 1.7 × 10-15 A/μm, a value that is below the noise floor of conventional DC measurements. These results have important implications for the future use of MoS2 MOSFETs in low-power circuit applications.

Original languageEnglish (US)
Pages (from-to)8457-8464
Number of pages8
JournalACS nano
Volume10
Issue number9
DOIs
StatePublished - Sep 27 2016

Bibliographical note

Funding Information:
This work was partially supported by the Defense Threat Reduction Agency Basic Research award no. HDTRA1-14-1- 0042 and the National Science Foundation (NSF) under award no. ECCS-1102278. Portions of this work were carried out in the Characterization Facility at the University of Minnesota, which has received capital equipment funding from NSF through the MRSEC program under award no. DMR-1420013.

Publisher Copyright:
© 2016 American Chemical Society.

Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.

Keywords

  • 2D materials
  • memory
  • MoS
  • MOSFET
  • transition-metal dichalcogenides

How much support was provided by MRSEC?

  • Shared

Reporting period for MRSEC

  • Period 3

PubMed: MeSH publication types

  • Journal Article

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