Two efficiency records set for monolithic silicon triple solar cells: Page 3 of 3

September 02, 2019 //By Christoph Hammerschmidt
Two efficiency records set for monolithic silicon triple solar cells
Researchers at the Fraunhofer Institute for Solar Energy Systems ISE have succeeded in further increasing the efficiency of monolithic triple-junction solar cells made of III-V semiconductors and silicon. By combining several absorber materials, these multi-junction solar cells make much better use of the solar spectrum than conventional silicon solar cells.

On the way to industrial mass production of monolithic multi-junction solar cells, the Fraunhofer ISE researchers see challenges especially in a cost-effective process for the production of III-V semiconductor layers. They currently regard direct growth on silicon as the most promising approach. However, research is also being conducted into methods in which the GaAs substrates are recycled many times after the semiconductor layers have been transferred to silicon. For cost-efficient throughput in solar cell production, new equipment must also be developed to achieve deposition on larger substrates in a shorter time. The ISE researchers will pursue these approaches in the coming years.

In addition to Fraunhofer ISE, the partners involved were semiconductor equipment supplier Aixtron SE, TU Ilmenau and the university of Marburg.

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