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An international research team led by Professor Martin-Green of the University of New South Wales in Australia has published the 65th edition of the "Solar Cell Efficiency Table" in the journal Progress in Photovoltaics.
The scientists said they had added 17 new results to the new table since June.
"The first is one of the most important entries - further improvements in the efficiency of silicon solar cells," Green said. "In version 64, the efficiency of the commercial-size cell produced by Longi has increased to 27.3%, and both polar contacts on the back of the cell are formed by the heterojunction (HJT) method, and in version 64, the efficiency of the same size cell produced by Longi has also increased to 27.4%. The two contacts on the back of the battery adopt a hybrid method, and the N-type contact adopts the TOPCon method.
"Another new result," he continued, "is that a similar rear-contact battery from Longi achieved 27.0%, but using the TOPCon method with both polar contacts on the back." "The third new result is Trina Solar's traditional front-to-rear contact cell, where the top P-type contact is formed by boron diffusion and the rear N-type contact is formed by TOPCon, with a result of 25.9%. The last new silicon result is a large 1.8 square meter solar module from Langi that has a silicon result of 25.4% by aperture area.
The table also includes several new achievements in lead halide peritectic batteries.
"What is perhaps most striking is the 26.9% efficiency of Oxford PV's large 1.6-square-meter module, which is also based on the aperture area, using a combination of cells with a phosphate cell deposited on top of each silicon cell, and this series cell approach is likely to eventually make the module far more efficient than 30%," explains Green. "The remarkable feature of this result is that, for the first time, it significantly exceeds the 25.4% efficiency achieved by similar-sized components using silicon cells alone, which is one of the necessary conditions for this approach to be commercialized," Green explained.
In addition, Renshine's large 0.7 square meter module using only peroxide cells is reported to have an efficiency of 17.2 percent, while smaller 215 square meter and 20 square meter peroxide "mini-modules" produced by other groups have an efficiency of 20.6 percent and 23.2 percent, respectively. The 64 SQM peroxide/peroxide series battery mini-module has an efficiency of 24.8%.
"Other notable perlite results include new records of 34.6% and 30.1% for Longi's 1 square centimeter and 212 square centimeter perlite/silicon tandem cells, and 25.1% for ultra-small perlite/organic tandem cells," Green said.
The final set of results is for batteries based on chromite (Group VI) compounds, which could become an alternative to peritectic stone if the stability of the latter cannot be greatly improved. First Solar has increased the efficiency of small-area cadmium telluride cells to 23.1%, and the University of New South Wales Sydney has set new efficiency limits of 13.2% and 10.7% for small Cu2ZnSnS4 and Sb2(S,Se)3 cells. The Chinese Academy of Sciences has set a figure of 12% for the Cu2ZnSn(S,Se)4 small module.
In the 64th edition of the table, released in June, the researchers added nine new results. Since the first table was published in 1993, the research team has made significant progress in all battery categories.
The research team includes scientists from the European Commission's Joint Research Center, the Fraunhofer Institute for Solar Energy Systems and the Institute for Solar Energy Research (ISFH) in Germany, the National Institute of Industrial Technology in Japan, and the National Renewable Energy Laboratory in the United States.
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