Fraunhofer ISE achieves 26 percent efficiency for double-sided contacted solar cell

German Fraunhofer Institute for Solar Energy Systems ISE reports a new efficiency world record of 26 percent for double-sided contacted silicon solar cells. The record cell was based on the TOPCon (Tunnel Oxide Passivating Contact) technology developed at Fraunhofer ISE, which combines very low surface recombination losses with efficient charge carrier transport.
According to the scientists, the efficiency of solar cells made of crystalline silicon has already come very close to the theoretical physical limit of the semiconductor material silicon (29.4 percent) in recent years. However, the previous record efficiencies of around 26 percent are limited to solar cells in IBC design (interdigitated back contact), i.e. solar cells with both metal contacts on the back. The industry standard, however, is solar cells with contacts on both sides.

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