Plasma-Driven Selenization for Electrical Property Enhancement in Janus 2D Materials

Shih Ming He, Jia Yung Zhuang, Ciao Fen Chen, Ren Kuei Liao, Shun Tsung Lo, Yen Fu Lin*, Ching Yuan Su*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The recent emergence of Janus 2D materials like SnSSe, derived from SnS2, reveals unique electrical and optical features, such as asymmetrical electronic structure, enhanced carrier mobility, and tunable bandgap. Previous theoretical studies have discuss the electronic properties of Janus SnSSe, but experimental evidence is limited. This study presents a two-step method for synthesizing Janus SnSSe, involving hydrogen plasma treatment and in situ selenization. Optimized conditions (38 W, 1.5 min, 250 °C) are determined using Raman spectroscopy and AFM analysis. XPS confirmed SnSSe's elemental composition, while KPFM reveals a significant reduction in the work function (from 5.26 down to 5.14 eV) for the first time, indicating asymmetrically induced n-type doping. Finally, field-effect transistors (FETs) derived from SnSSe exhibited significantly enhanced mobility and on-current, as well as n-type doping, compared to SnS2-based FETs. These findings lay a crucial foundation for developing high-performance 2D electronic and optoelectronic devices.

Original languageEnglish
JournalSmall Methods
DOIs
StateAccepted/In press - 2024

Keywords

  • field-effect transistor
  • Janus 2D Materials
  • selenization
  • SnSSe
  • work function

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