A commercial bifacial HJT solar cell with 24.1% efficiency

The cell is being manufactured by Switzerland-headquartered Ecosolifer with a manufacturing line provided by heterojunction specialist Meyer Burger at a 100 MW factory located in Hungary. The claimed efficiency is yet to be confirmed by an independent party.

Solar cell manufacturer Ecosolifer AG has started commercial production of its bifacial heterojunction solar cells at its 100 MW factory in Csorna, Hungary.

“We are planning to move from one shift mode with 14 MW of capacity to a three shifts system for a total capacity of 100 MW by the end of the second quarter,” the company COO, Rikus Janken, told pv magazine.

According to Janken, the capacity of the factory, which is using a production line provided by Swiss equipment supplier Meyer Burger, may be further raised to 300 MW at a later stage depending on market development.

The cells produced at the facility, which are mostly to be distributed among European module makers, have now reached a conversion efficiency of 24.1%, according to Janken. This result, however, must still be confirmed by a third party. “These results were so far only measured internally with our own measurement equipment,” he further explained.

The average efficiency of the manufactured cell is around 23.5%, not including the bifacial power, Janken added.

According to the cell product sheet, the 156.75 x 156.75 mm device has a thickness of 20 mm and is based on a n-type monocrystalline wafer. Both the front and rear sides are busbarless, textured and have transparent conductive oxide (TCO) and antireflective coating.

The cell is available with four different power outputs. With the claimed 24.1% efficiency, the cell has an output of 5.86 W, while a second typology with power output ranging from 5.74 W and 5.85 W has an efficiency between 23.50% and 23.99%. A third version of the cell has an output of 5.61 W to 5.73 W and an efficiency between 23.0% and 23.49%. The cell with the lowest performance of between 22.50% and 22.99% is a device with output varying from 5.49 W and 5.60 W.

The cells are also said to have a low thermal coefficient (< 0.24 %/K) and bifaciality above 93%. “Thanks to these excellent parameters photovoltaic modules assembled from EcoSolifer’s heterojunction cell might have the lowest LCoE achievable on the market nowadays,” Janken stated.

The company had originally planned to begin the commercial production in the first quarter of 2018, while the first cells were set to come off the production line in the first half of last year. In August 2015, EcoSolifer signed an around CHF 23 million (approx. US$29.5 million) agreement with Switzerland-based Meyer Burger Technology Ltd for the delivery of the necessary HJT equipment.

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