News Article
Imec and Meco advance silicon solar cell cost and efficiency
New large area i-PERC-type cells measuring 156 x 156mm2 achieve 20.5 percent average efficiency using nickel/copper plating on p-type Czochralski Silicon (Cz-Si) material
At the European Photovoltaic Solar Energy Conference and Exhibition in Paris, imec and Meco presented 156 x 156mm2 i-PERC-type silicon solar cells with industry-applicable Nickel/Copper (Ni/Cu) plating for the front contacts. Together, the companies achieved an excellent average efficiency of 20.5 percent on more than 100 cells, and a maximum efficiency of 20.7 percent as confirmed by ISE callab. A low standard deviation of 0.1 percent and an average fill factor of 80 percent validated the high quality of the front contacts.
New large area cells (156 x 156mm2) achieve 20.5 percent average efficiency using Nickel/Copper plating on p-type Czochralski Silicon (Cz-Si) material.
"Not only do these results show a considerable performance improvement compared to state-of-the-art screen-printed PERC cells, but our Cost-of-Ownership analysis also indicates a clear advantage on the financial level," states Jozef Szlufcik, Department director silicon photovoltaics at imec. "Our results show that Ni/Cu plating is one of the few new technologies that can simultaneously improve the efficiency of PERC solar cells, while reducing processing cost." The cells were processed on imec's solar cell pilot line using Meco's inline plating tool to deposit the Ni/Cu front contacts. The metallisation process of the Ni/Cu stack included Ultraviolet laser ablation, sequential in-line plating of the metal layers and contact annealing. We now have the advantage of using Meco's industrial plating techniques and tools that were not available to earlier Ni/Cu adopters," says Richard Russell, Metallisation module leader at imec. "This gives us the opportunity to develop a more robust and cheaper process than was previously possible." "We are elated to have achieved these excellent results in the framework of imec's industrial affiliation program on advanced silicon photovoltaics aiming at a reduction of the cost/Watt-peak (Wp)," adds Martijn Zwegers, Product manager solar at Meco. "Collaborating within imec's industrial ecosystem enables us to accommodate our advanced plating tools to industrial processing."