Highly stable two-dimensional silicon phosphides: Different stoichiometries and exotic electronic properties

Bing Huang, Houlong L. Zhuang, Mina Yoon, Bobby G. Sumpter, Su Huai Wei

Research output: Contribution to journalArticle

27 Scopus citations

Abstract

The discovery of stable two-dimensional, earth-abundant, semiconducting materials is of great interest and may impact future electronic technologies. By combining global structural prediction and first-principles calculations, we have theoretically discovered several semiconducting silicon phosphide (SixPy) monolayers, which could be formed stably at the stoichiometries of y/x≥1. Interestingly, some of these compounds, i.e., P-6m2Si1P1 and PmSi1P2, have comparable or even lower formation enthalpies than their known allotropes. The band gaps (Eg) of SixPy compounds can be dramatically tuned in an extremely wide range (0<Eg<3 eV) by simply changing the number of layers. Moreover, we find that carrier doping can drive the ground state of C2/mSi1P3 from a nonmagnetic state into a robust half-metallic spin-polarized state, originating from its unique valence band structure, which can extend the use of Si-related compounds for spintronics.

Original languageEnglish (US)
Article number121401
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume91
Issue number12
DOIs
StatePublished - Mar 3 2015
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Fingerprint Dive into the research topics of 'Highly stable two-dimensional silicon phosphides: Different stoichiometries and exotic electronic properties'. Together they form a unique fingerprint.

  • Cite this