High-Throughput Screening of Thin-Film Semiconductor Material Libraries II: Characterization of Fe-W-O Libraries

摘要

Metal oxides are promising materials for solar water splitting. To identify suitable materials within the ternary system FeWO, thin-film material libraries with combined thickness and compositional gradients were synthesized by combinatorial reactive magnetron sputtering. These libraries (>1000 different samples) were investigated by means of structural and functional high-throughput characterization techniques to establish correlations between composition, crystallinity, morphology, thickness, and photocurrent density in the compositional range between (Fe6W94)O-x and (Fe61W39)O-x. In addition to the well-known phase WO3, the binary phase W5O14 and the ternary phase Fe2O6W show enhanced photoelectrochemical activity. The highest photocurrent density of 65Acm(-2) was achieved for the composition (Fe15W85)O-x, which contains the W5O14 phase and has a thickness of 1060nm.