Publications

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

Stein, H.S. and Müller, S. and Schwarzburg, K. and Friedrich, D. and Ludwig, Al. and Eichberger, R.

ACS APPLIED MATERIALS AND INTERFACES
Volume: 10 Pages: 35869-35875
DOI: 10.1021/acsami.8b04900
Published: 2018

Abstract
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. © 2018 American Chemical Society.

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