The conversion efficiency of heterojunction silicon solar cells developed by Japanese companies exceeds 21%

It is reported that Japan's KANEKA and Belgium's IMEC recently announced that they have jointly developed a 6-inch (about 15 cm) square heterojunction silicon solar cell with copper (Cu) instead of silver (Ag) as the collector material, achieving a conversion efficiency of more than 21%.

Heterojunction silicon solar cells refer to solar cells whose pn junctions are made of silicon materials in different states, such as microcrystalline silicon and crystalline silicon. This time, KANEKA and IMEC used copper plating technology in the collector formation technology, replacing the silver screen printing technology that had been used before.