Solliance achieves 26.3% efficiency for perovskite-silicon solar cell

Solliance, the European thin-film solar research partnership, last week announced 26.3% efficiency for a tandem perovskite silicon solar cell.

Solliance said it has developed a perovskite solar cell with 93 % average near infrared transparency. It added that Energy research Centre of the Netherlands (ECN) has demonstrated 26.3% efficiency when this perovskite cell is mechanically stacked on its 6 inch2 industrially processed crystalline silicon cell. This is 3.6 percentage points above the efficiency of the directly illuminated silicon cell laminate.

"This result shows how feasible it is to achieve significant efficiency gain even over high-end crystalline silicon technology and based on industrial process technology," commented Gianluca Coletti of ECN.

The bottom cell contributed 9.9 percentage points to the efficiency of the tandem.

"The active area of the tested small semi-transparent perovskite cell is 0.09 cm2; the power conversion efficiency is 16.4 %," Sjoerd Veenstra, programme manager Perovskite Solar Cells at Solliance, explained, adding that the performance measurement of the four terminal hybrid tandem was according to the generally accepted procedure.

"Now that the device was proven with spin coated layers, we use pilot scale equipment provided by our industrial partners to scale it to a viable industrial production process," said Veenstra.

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