Solar ♦ news digest
Energy Laboratory (NREL) “Best Research Cell Efficiencies” reference chart.
This certified result bests the previous CdTe record of 20.4 percent conversion efficiency, which was set by First Solar in February of 2014, and represents the seventh substantial update to CdTe record efficiency since 2011. The achievement also places First Solar’s CdTe research cell efficiency above copper indium gallium diselenide based solar cells (CIGS) at 20.9 percent, and well above multicrystalline silicon (mSi), which peaked at 20.4 percent in 2004.
“We have just begun to reveal the true unrealized potential of CdTe PV,” said Raffi Garabedian, First Solar’s Chief Technology Officer. “Our Advanced Research team continues to deliver extraordinary results by creating practical devices capable of commercial scale production. Not only have we have now demonstrated the highest single junction thin film cell on record, but just as important, our record cells are based on the same scalable manufacturing processes and commodity materials that we have proven through years of volume production.”
Garabedian noted that while competing technologies are using increasingly costly materials and cell processes in order to deliver moderate performance gains, First Solar is establishing a rapid path to industry-leading energy densities, while simultaneously improving manufacturing metrics.
“Our significant investment in development of CdTe thin-film technology has enabled a rapid rate of improvement and gives us tremendous confidence in the future,” said Markus Gloeckler, First Solar Vice President for Advanced Research. “We have made outstanding improvements in all aspects of our thin-film solar cells and are aggressively pursuing the commercialization of these advanced technologies in our product.”
At an analyst briefing last March, First Solar presented a technology roadmap anticipating a 22 percent research cell efficiency milestone in 2015. This announcement indicates First Solar is steadily tracking to achieve that goal ahead of schedule.
First Solar has continued to transfer its success in the R&D lab into its commercially produced modules, increasing its average production module
Issue VI 2014
www.compoundsemiconductor.net 109
efficiency to 14 percent in the second quarter of 2014, up 0.5 percent from the first quarter of the year, and up 0.7 percent from FY2013. The company’s lead line was producing modules with 14.1 percent average efficiency at the end of the second quarter of 2014.
Sheets of stapled
semiconductors could make ultra thin solar cells
Researchers combine tungsten diselenide with molybdenum disulphide to create ‘designer’ optoelectronic material
Researchers at the Vienna University of Technology have used two ultra-thin layers to create a new semiconductor structure suited for photovoltaic energy conversion.
Several months ago, Marco Furchi, Thomas Mueller, and Andreas Pospischil (pictured l-r) produced an ultra-thin layer of the photoactive crystal tungsten diselenide. Now, they have combined this semiconductor with another layer made of molybdenum disulphide, creating a material that shows potential for a new kind of solar cell technology, they say, that is extremely thin, semi-transparent, and flexible.
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