Liten research institute claims 24.25% efficiency for heterojunction cell

The French institute said the result has been certified by ISFH CalTeC, in Germany. The manufacturers claim they were able to increase cell performance by improving the plasma-enhanced chemical vapor deposition of amorphous silicon nanolayers and the conductive and anti-reflective transparent oxide layers.

The new energy technologies and nanomaterials (Liten) branch of the French Alternative Energies and Atomic Energy Commission claims to have achieved 24.25% peak efficiency for a silicon heterojunction solar cell. The French researchers said the result has been independently confirmed by ISFH CalTeC, in Germany.

The commercially produced cells were manufactured with industrial equipment at 2,400 units per hour. “The results are even more impressive given that the measurements were taken over the entire surface of the M2 format, 244 cm² of cells,” the research institute said.

The cell developers said they were able to increase performance by improving the plasma-enhanced chemical vapor deposition of amorphous silicon nanolayers and the conductive and anti-reflective transparent oxide layers. They also reduced wafer-handling damage during manufacturing.

“The test runs confirm that silicon heterojunction cell technology is viable both in terms of the technology and manufacturability,” the research team added.

In August, Hanergy set a new efficiency record for a silicon heterojunction module, at 24.85%. That edged out the previous record of 24.5% held by Japanese company Kaneka, which still holds the record for heterojunction cell efficiency, at 26.7% on a slightly smaller cell.

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