Charge Carrier Lifetimes in Cr-Fe-Al-O Thin Films

Helge S. Stein, Sönke Müller, Klaus Schwarzburg, Dennis Friedrich, Alfred Ludwig, Rainer Eichberger

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


The effect of compositional variation on charge carrier lifetimes of Cr1Fe0.84Al0.16O3, a promising material for solar water splitting recently identified using combinatorial materials science, is explored using ultrafast time-resolved optical reflectance. The transient signal can be described by a biexponential decay, where the shorter time constant varies over 1 order of magnitude with changing Cr content while the longer one stays constant. Intrinsic performance limitations such as a low charge carrier mobility on the order of 10-3 cm2/(Vs) are identified. Charge carrier lifetime and mobility are discussed as screening criteria for solar water splitting materials.

Original languageEnglish
Pages (from-to)35869-35875
Number of pages7
JournalACS Applied Materials and Interfaces
Issue number42
StatePublished - 24 Oct 2018
Externally publishedYes


  • Cr-Fe-Al-O
  • TRMC
  • charge carrier lifetime
  • combinatorial materials science
  • photoelectrochemistry
  • ultrafast spectroscopy


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