Trina Solar announces that its State Key Laboratory (SKL) of PV Science and Technology (PVST) has fabricated a PERC cell with 23,39% efficiency solely using standard manufacturing equipment. To their best of their knowledge, this is the highest efficiency confirmed by an ISO/IEC 17025 certified calibration laboratory for such an industrial cell.
The cell has an area of 252 cm2, is bifacial and has nine busbars as used in many Trina modules. The cell was calibrated at ISFH CalTeC in Germany under full area illumination (with full front metallization taken into account) on a brass chuck contacting the whole rear area. The only difference to mass production is that, during deposition of the antireflection coating, parameters were adjusted as slightly as possible so the cell has the improved light trapping properties during calibration in air as the cell has when encapsulated in a module.
The company says that although higher PERC cell efficiencies are announced from time to time, they usually exclude the details about metallisation, or whether passivating contacts were used. This makes it difficult to assess progress in the field. Trina Solar is open about its manufacturing details.
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