Charge Carrier Lifetimes in Cr-Fe-Al-O Thin Films.
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.
['Stein|Helge S|HS|', 'Müller|Sönke|S|', 'Schwarzburg|Klaus|K|', 'Friedrich|Dennis|D|', 'Ludwig|Alfred|A|http://orcid.org/0000-0003-2802-6774', 'Eichberger|Rainer|R|http://orcid.org/0000-0001-9521-0024']
charge carrier lifetime combinatorial materials science Cr−Fe−Al−O TRMC photoelectrochemistry ultrafast spectroscopy