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Current issue

ELEKTRO 1/2018 was released on January 16th 2018. Its digital version will be available on February 12th 2018.

Topic: Electrotechnology; Materials for electrical engineering; Wiring material

Main Article
A new electrical insulating fluid and its possible deployment in practice

SVĚTLO (Light) 6/2017 was released on December 11th 2017. Its digital version will be available on january 11th 2018.

Lighting installations
The lighting of university building Centrale Supélec in Saclay in France
The light for our future

Daylight
Application and judgment light guides Solatube®

Efficiency of Silicon Solar Cells Climbs

24.03.2017 | IEEE Spectrum | spectrum.ieee.org

In research published recently in Nature Energy, researchers at Kaneka Corp., a resin and plastics manufacturer based in Osaka, describe the first silicon solar cell to achieve a record-breaking 26.3 percent efficiency—a 0.7 percent increase over the previous record. That may not seem like a lot, but it’s really a big step when you consider that silicon solar cells’ theoretical maximum efficiency is just 29 percent.

In producing its new 180.43-square-centimeter monocrystalline silicon prototype cell, Kaneka further developed and improved on several of the technologies promoted by New Energy and industrial Technology Development Organization (NEDO). Chief among them is Kaneka’s proprietary heterojunction technology. It reduces recombination, or resistive loss, where instead of exiting the device to produce electricity, positive and negative charges in the solar cell combine and produce heat.

More efficient solar cells

In addition, the company improved the energy-collection efficiency of the solar cell’s interdigitated electrodes. But even more important, Kaneka moved the grid of electrodes from the front of the cell—the light-receiving area—to the back, boosting the amount of sunlight entering the cell, thereby reducing losses in the optics.

Read more at IEEE Spectrum

Image Credit: Kunta Yoshikawa/Kaneka/Nature Energy

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