JA Solar has announced that it has achieved a record-breaking open-circuit voltage for a solar cell based on tunnel oxide passivated contact technology (TOPCon).
The German Institute for Solar Energy Research in Hamelin (ISFH) has independently certified the result, according to the Chinese PV module manufacturer.
JA Solar said the result was achieved for its Bycium+ solar cell, which achieved an energy conversion efficiency of 26.07%, an open-circuit voltage of 748.6 mV, a short-circuit current of 13.71 mA and a fill factor of 83.82%.
“The new record demonstrates a passivation level comparable to heterojunction (HJT) PV cells and surpasses the open-circuit voltage record of the back-contact (BC) cell,” the manufacturer said. “This milestone not only demonstrates the enormous potential of TOPCon technology, but also sets a new benchmark for the development of crystalline silicon PV cells.”
The company attributed the result to the passivation structure of its TOPCon cells, which it said minimizes surface, bulk and metal recombination. “By integrating innovations in metallization, new materials and processes, JA Solar has achieved a record-breaking open-circuit voltage,” the report said, without giving further technical details.
The previous world record open-circuit voltage for a TOPCon cell was achieved in January by the Chinese DAS Solar. At the time, the Chinese manufacturer said it achieved an open-circuit voltage of 742 mV, with a power conversion efficiency of 26.33%.
China’s National Measurement and Test Center for PV Industry (NPVM) confirmed the result.
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