News Column

New Findings on Combinatorics Discussed by Researchers at California Institute of Technology

June 4, 2014

By a News Reporter-Staff News Editor at Electronics Newsweekly -- Investigators discuss new findings in Combinatorics. According to news reporting originating from Pasadena, California, by VerticalNews correspondents, research stated, "Combinatorial synthesis and screening of light absorbers are critical to material discoveries for photovoltaic and photoelectrochemical applications. One of the most effective ways to evaluate the energy-conversion properties of a semiconducting light absorber is to form an asymmetric junction and investigate the photogeneration, transport and recombination processes at the semiconductor interface."

Our news editors obtained a quote from the research from the California Institute of Technology, "This standard photoelectrochemical measurement is readily made on a semiconductor sample with a back-side metallic contact (working electrode) and front-side solution contact. In a typical combinatorial material library, each sample shares a common back contact, requiring novel instrumentation to provide spatially resolved and thus sample-resolved measurements. We developed a multiplexing counter electrode with a thin layer assembly, in which a rectifying semiconductor/liquid junction was formed and the short-circuit photocurrent was measured under chopped illumination for each sample in a material library. The multiplexing counter electrode assembly demonstrated a photocurrent sensitivity of sub-10 ?A cm(-2) with an external quantum yield sensitivity of 0.5% for each semiconductor sample under a monochromatic ultraviolet illumination source. The combination of cell architecture and multiplexing allows high-throughput modes of operation, including both fast-serial and parallel measurements. To demonstrate the performance of the instrument, the external quantum yields of 1819 different compositions from a pseudoquaternary metal oxide library, (Fe-Zn-Sn-Ti)Ox, at 385 nm were collected in scanning serial mode with a throughput of as fast as 1 s per sample."

According to the news editors, the research concluded: "Preliminary screening results identified a promising ternary composition region centered at Fe0.894Sn0.103Ti0.0034Ox, with an external quantum yield of 6.7% at 385 nm."

For more information on this research see: Mapping quantum yield for (Fe-Zn-Sn-Ti)Ox photoabsorbers using a high throughput photoelectrochemical screening system. Acs Combinatorial Science, 2014;16(3):120-7. (American Chemical Society -; Acs Combinatorial Science -

The news editors report that additional information may be obtained by contacting C. Xiang, Joint Center for Artificial Photosynthesis, California Institute of Technology , Pasadena, California 91125, United States. Additional authors for this research include J. Haber, M. Marcin, S. Mitrovic, J. Jin and J.M Gregoire.

Keywords for this news article include: Pasadena, California, Electronics, United States, Combinatorial, Semiconductor, North and Central America.

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Source: Electronics Newsweekly

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