Dual-gated MoS2/WSe2van der Waals tunnel diodes and transistors

Tania Roy, Mahmut Tosun, Xi Cao, Hui Fang, Der Hsien Lien, Peida Zhao, Yu Ze Chen, Yu Lun Chueh, Jing Guo, Ali Javey

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308 Citations (Scopus)

Abstract

Two-dimensional layered semiconductors present a promising material platform for band-to-band-tunneling devices given their homogeneous band edge steepness due to their atomically flat thickness. Here, we experimentally demonstrate interlayer band-to-band tunneling in vertical MoS2/WSe2van der Waals (vdW) heterostructures using a dual-gate device architecture. The electric potential and carrier concentration of MoS2and WSe2layers are independently controlled by the two symmetric gates. The same device can be gate modulated to behave as either an Esaki diode with negative differential resistance, a backward diode with large reverse bias tunneling current, or a forward rectifying diode with low reverse bias current. Notably, a high gate coupling efficiency of ∼80% is obtained for tuning the interlayer band alignments, arising from weak electrostatic screening by the atomically thin layers. This work presents an advance in the fundamental understanding of the interlayer coupling and electron tunneling in semiconductor vdW heterostructures with important implications toward the design of atomically thin tunnel transistors.

Original languageEnglish
Pages (from-to)2071-2079
Number of pages9
JournalACS Nano
Volume9
Issue number2
DOIs
Publication statusPublished - 2015 Feb 24

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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    Roy, T., Tosun, M., Cao, X., Fang, H., Lien, D. H., Zhao, P., Chen, Y. Z., Chueh, Y. L., Guo, J., & Javey, A. (2015). Dual-gated MoS2/WSe2van der Waals tunnel diodes and transistors. ACS Nano, 9(2), 2071-2079. https://doi.org/10.1021/nn507278b