High-throughput screening of thin-film semiconductor material libraries I: system development and case study for...

Area of Science:

• Materials Science
• Electrochemistry
• Optoelectronics

Background:

• Characterizing thin-film semiconductor libraries is crucial for discovering new electronic materials.
• Existing methods for photoelectrochemical analysis can be time-consuming and lack high-throughput capabilities.

Purpose of the Study:

• To develop and validate an automated optical scanning droplet cell (OSDC) for high-throughput quantitative photoelectrochemical characterization of thin-film semiconductor libraries.
• To demonstrate the system's performance in screening a TiWO thin film.

Main Methods:

• Utilized an automated optical scanning droplet cell (OSDC) with integrated electrodes and a precise positioning system.
• Employed a Xe lamp and monochromator coupled via a poly(methyl methacrylate) (PMMA) optical fiber for illumination.
• Defined measurement areas using a polytetrafluoroethylene (PTFE) capillary tip and recorded various photoelectrochemical parameters.

Main Results:

• The OSDC successfully recorded intensity-dependent photopotentials and -currents, potentiodynamic and potentiostatic photocurrents, and photocurrent spectra.
• Precise determination and calibration of irradiation intensities and measurement areas were achieved.
• Demonstrated effective screening of a TiWO thin film, validating the system's performance.

Conclusions:

• The developed OSDC system enables efficient, high-throughput quantitative characterization of thin-film semiconductor materials.
• This automated approach accelerates the screening process for material libraries, facilitating the discovery of advanced electronic materials.