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Leading Chinese module manufacturer JinkoSolar has developed a new n-type tunnel oxide passivated contact (TOPCon) perovskite tandem cell, with a power conversion efficiency of 33.24%, a new record for the company.

The cell, tested by the Shanghai Institute of Microsystem and Information Technology of the Chinese Academy of Sciences, is a significant improvement over the company’s previous record conversion efficiency of 32.33% for this type of cell. The company noted that “various materials and technology innovations” drove the improvements, including the use of “ultra-thin” polysilicon and what JinkoSolar called “novel light-trapping technology”.

“This milestone breakthrough once again highlights JinkoSolar’s determination to continuously push the boundaries through strong technological innovation capabilities,” said JinkoSolar CTO Dr Jin Hao. “It also lays a solid technical foundation for the company’s continuous development.”

The news follows considerable investment into the tandem solar cell field, with fellow Chinese manufacturer LONGi announcing a similar crystalline silicon-perovskite cell with a power conversion efficiency of 33.9% late last year. In its announcement, LONGi noted that the maximum theoretical power conversion efficiency for such tandem cells could be as high as 43%, so there is ample space for further innovation in this type of cell technology.