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A battery structure composed of four solar sub-cells has created a new solar energy conversion efficiency world record. The battery's conversion efficiency is as high as 44.7%. The battery structure was designed and built by researchers from the Fraunhofer Institute for Solar Energy Systems, Soitec, CEA-Leti and the Helmholtz Center in Berlin.
The team's researchers came from France and Germany. In May this year, the team has announced that their solar cell efficiency is 43.6%. On this basis, team researchers have managed to increase their battery conversion efficiency to 44.7%. The measured illuminance of the battery efficiency was 297 suns. This means that 44.7% of the solar spectrum from ultraviolet to infrared energy is converted to electrical energy.
Four-junction solar cells can be used for photovoltaic or concentrating photovoltaic power generation, and several types of III-V semiconductor materials (composed of Group III-V groups of the periodic table) are added to solar cells. These materials are stacked on one another. Above. The individual subcells absorb light energy in different wavelength ranges of the solar spectrum.
Frank Dimroth, head of the department responsible for the development work Fraunhofer D and project leader, said: The four solar cell sub-cells have been crystallizing this expertise in the past years. In addition to using improved materials and optimizing the structure, a new program called Wafer Bonding is called the core role. With this technology, we can connect two semiconductor crystals together, otherwise the two crystals cannot be on top of each other. Links, while also ensuring high crystal properties. In this way, we can produce the best semiconductor combination to create the highest efficiency solar cell.
Soitec's CEO André-Jacques Auberton-Hervé believes that the four-cell battery architecture design based on Soitec's connection technology and expertise will make a huge contribution to the competitiveness of Soitec's CPV system. Soitec (in the name of Concentrix Solar, formerly Fraunhofer) produced the CPV system. Soitec currently installs concentrator photovoltaic systems in 18 different countries, including Italy, France, South Africa and California.
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