Preparation and optical properties of higher manganese silicide, (Mn,Fe)Si γ , thin films

Kei Hayashi, Kentaro Ishii, Chihiro Kawasaki, Ryosuke Honda, Yuzuru Miyazaki

Research output: Contribution to journalArticlepeer-review

Abstract

In this article, the optical properties of thin films of higher manganese silicide (HMS) systems, MnSi γ and (Mn,Fe)Si γ , were investigated. Band structure calculations were performed using the Mn 11 Si 19 and (Mn 31/44 Fe 13/44 ) 11 Si 19 crystal structure models of HMS to predict the conduction types and band gaps of MnSi γ and Mn 0.7 Fe 0.3 Si γ , respectively. Using a pulsed laser deposition method, p-type MnSi γ and n-type Mn 0.7 Fe 0.3 Si γ thin films with a-axis orientation were grown on R-sapphire substrates. The measured direct band gaps were 0.81(1) eV for the MnSi γ thin film and 0.83(2) eV for the Mn 0.7 Fe 0.3 Si γ thin film. These results demonstrate the potential of (Mn,Fe)Si γ -based near-infrared absorption solar cells.

Original languageEnglish
Pages (from-to)700-704
Number of pages5
JournalApplied Surface Science
Volume458
DOIs
Publication statusPublished - 2018 Nov 15

Keywords

  • Electronic structure
  • Epitaxial growth
  • Fe substitution
  • Higher manganese silicide
  • Optical absorption
  • Pulsed laser deposition

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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