Interfacial Band Engineering of MoS2/Gold Interfaces Using Pyrimidine-Containing Self-Assembled Monolayers: Toward Contact-Resistance-Free Bottom-Contacts

Research output: Contribution to journalLetterResearchpeer-review

Authors

  • Andreas Petritz
  • Gerburg Schider
  • Markus Krammer
  • Esther Karner-Petritz
  • Alexander Fian
  • Herbert Gold
  • Michael Gärtner
  • Andreas Terfort
  • Egbert Zojer
  • K. Zojer
  • Barbara Stadlober

Organisational units

External Organisational units

  • Institute of Nanostructured Materials and Photonics, Joanneum Research
  • Technische Universität Graz
  • Goethe University Frankfurt
  • Joanneum Research Forschungsgesellschaft mbH
  • Institute for Surface Technologies and Photonics, Joanneum Research Forschungsgesellschaft mbH

Abstract

Bottom-contact architectures with common electrode materials such as
gold are crucial for the integration of 2D semiconductors into existing
device concepts. The high contact resistance to gold—especially for bottom
contacts—is, however, a general problem in 2D semiconductor thin-film
transistors. Pyrimidine-containing self-assembled monolayers on gold
electrodes are investigated for tuning the electrode work functions in order
to minimize that contact resistance. Their frequently ignored asymmetric and
bias-dependent nature is recorded by Kelvin probe force microscopy through
a direct mapping of the potential drop across the channel during device
operation. A reduction of the contact resistances exceeding two orders of
magnitude is achieved via a suitable self-assembled monolayer, which vastly
improves the overall device performance.

Details

Original languageEnglish
Article number2000110
Pages (from-to)2000110-1-6
Number of pages6
JournalAdvanced Electronic Materials
Volume6
Publication statusPublished - 18 Mar 2020