A reversible and stable doping technique to invert the carrier polarity of MoTe2

Sikandar Aftab, Ms Samiya, Ali Raza, Muhammad Waqas Iqbal, Hafiz Mansoor Ul Haque, Karna Ramachandraiah, Saqlain Yousuf, Seong Chan Jun, Atteq Ur Rehman, Muhammad Zahir Iqbal

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

Two-dimensional (2D) materials can be implemented in several functional devices for future optoelectronics and electronics applications. Remarkably, recent research on p–n diodes by stacking 2D materials in heterostructures or homostructures (out of plane) has been carried out extensively with novel designs that are impossible with conventional bulk semiconductor materials. However, the insight of a lateral p–n diode through a single nanoflake based on 2D material needs attention to facilitate the miniaturization of device architectures with efficient performance. Here, we have established a physical carrier-type inversion technique to invert the polarity of MoTe2-based field-effect transistors (FETs) with deep ultraviolet (DUV) doping in (oxygen) O2 and (nitrogen) N2 gas environments. A p-type MoTe2 nanoflake transformed its polarity to n-type when irradiated under DUV illumination in an N2 gaseous atmosphere, and it returned to its original state once irradiated in an O2 gaseous environment. Further, Kelvin probe force microscopy (KPFM) measurements were employed to support our findings, where the value of the work function changed from ∼4.8 and ∼4.5 eV when p-type MoTe2 inverted to the n-type, respectively. Also, using this approach, an in-plane homogeneous p–n junction was formed and achieved a diode rectifying ratio (If/Ir) up to ∼3.8 × 104. This effective approach for carrier-type inversion may play an important role in the advancement of functional devices.

Original languageEnglish
Article number285701
JournalNanotechnology
Volume32
Issue number28
DOIs
Publication statusPublished - 2021 Jul 9

Bibliographical note

Publisher Copyright:
© 2021 IOP Publishing Ltd.

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • General Chemistry
  • General Materials Science
  • Mechanics of Materials
  • Mechanical Engineering
  • Electrical and Electronic Engineering

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