High-throughput screening of thin-film semiconductor material libraries I: system development and case study for Ti-W-O.
An automated optical scanning droplet cell (OSDC) enables high-throughput quantitative characterization of thin-film semiconductor material libraries. Photoelectrochemical data on small selected measurement areas are recorded including intensity-dependent photopotentials and -currents, potentiodynamic and potentiostatic photocurrents, as well as photocurrent (action) spectra. The OSDC contains integrated counter and double-junction reference electrodes and is fixed on a precise positioning system. A Xe lamp with a monochromator is coupled to the cell through a thin poly(methyl methacrylate) (PMMA) optical fiber. A specifically designed polytetrafluoroethylene (PTFE) capillary tip is pressed on the sample surface and defines through its diameter the homogeneously illuminated measurement area. The overall and wavelength-resolved irradiation intensities and the cell surface area are precisely determined and calibrated. System development and its performance are demonstrated by means of screening of a TiWO thin film.
Analytical Chemistry-Center for Electrochemical Sciences (CES), Ruhr-Universität Bochum, Universitätsstr. 150, 44780 Bochum (Germany).
Kirill
K
Sliozberg
Dominik
D
Schäfer
Thomas
T
Erichsen
Robert
R
Meyer
Chinmay
C
Khare
Alfred
A
Ludwig
Wolfgang
W
Schuhmann
D004563:Electrochemistry; D055096:Optical Devices; D010100:Oxygen / Q000737:chemistry*; D019904:Polymethyl Methacrylate / Q000737:chemistry; D012666:Semiconductors; D014025:Titanium / Q000737:chemistry*; D014414:Tungsten / Q000737:chemistry*
D019904:Polymethyl Methacrylate; D014025:Titanium; D010100:Oxygen; D014414:Tungsten
combinatorial chemistry; high-throughput screening; material library; photoelectrochemistry; water splitting