Electron transport in pure and doped hematite

Peilin Liao, Maytal Caspary Toroker, Emily A. Carter

Research output: Contribution to journalArticle

181 Scopus citations

Abstract

Hematite (α-Fe2O3) is a promising candidate for photoelectrochemical splitting of water. However, its intrinsically poor conductivity is a major drawback. Doping hematite to make it either p-type or n-type enhances its measured conductivity. We use quantum mechanics to understand how titanium, zirconium, silicon, or germanium n-type doping affects the electron transport mechanism in hematite. Our results suggest that zirconium, silicon, or germanium doping is superior to titanium doping because the former dopants do not act as electron trapping sites due to the higher instability of Zr(III) compared to Ti(III) and the more covalent interactions between silicon (germanium) and oxygen. This suggests that use of n-type dopants that easily ionize completely or promote covalent bonds to oxygen can provide more charge carriers while not inhibiting transport.

Original languageEnglish (US)
Pages (from-to)1775-1781
Number of pages7
JournalNano Letters
Volume11
Issue number4
DOIs
StatePublished - Apr 13 2011

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

Keywords

  • Iron oxides
  • electron transport
  • n-type doping

Fingerprint Dive into the research topics of 'Electron transport in pure and doped hematite'. Together they form a unique fingerprint.

  • Cite this