The data report was certified by China’s National PV Industry Measurement and Testing Center (NPVM), and breaks DAS Solar’s efficiency record for TOPCon 4.0 large-area (334cm2) cells, which it set at 26.33% in September 2023. The open-circuit voltage has surpassed 740mV, reaching 742mV, breaking the record set by DAS Solar with 735mV in December 2023. This achievement sets a record for the highest open-circuit voltage of crystalline silicon homojunction solar cells.
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Further efficiency improvements of the TOPCon technology expected
As a leader in N-type technology, DAS Solar is dedicated to continuous exploration and rigorous research in N-type technology, consistently surpassing industry standards in cell and module efficiency. "DAS Solar's R&D team has consistently improved the open-circuit voltage of TOPCon cells, progressing from 701mV with TOPCon1.0 to 742mV with TOPCon4.0 Plus. A perfect passivation structure in the cell underpins its ability to achieve high open-circuit voltage. The TOPCon technology is expected to progress towards its theoretical limit of 28.7% in the near future." said DAS Solar CTO, Song Dengyuan.
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TOPCon4.0 Plus establishes a design philosophy for high open-circuit voltage in cells, integrating four innovative features: a new charge carrier transport mechanism, a new cell structure design, innovative metallization technology, and the application of new materials. Equipped with the latest technology, achieving seamless integration of all technologies from TOPCon1.0 to 4.0 Plus while optimizing each manufacturing process. This results in a higher open-circuit voltage, improved cell efficiency, and effectively reduces the levelized cost of electricity (LCOE). (hcn)
