“I do think that the industry will follow in those footsteps, as the PV industry is a ‘follower industry.” When the big players start with something, the others follow,” Radovan Kopecek, the co-founder and director of German research institute the International Solar Energy Research Center Konstanz (ISC Konstanz), told pv magazine. “An immediate transition to copper is technically and economically feasible. Copper screen printing can be implemented quickly, and we have received many inquiries about it.”
According to Kopecek, project developers are “absolutely” ready to embrace copper-metallised products, adding that when the technology is properly implemented, performance does not differ from that of silver-metallised modules. “However, I do not expect the industry to abandon silver completely,” he said. “Silver will remain at around 2 mg to 3 mg per watt, as it is still needed for firing through, as a diffusion barrier, and to establish contact with the emitter.”
Ning Song, from the University of New South Wales (UNSW) in Australia, explained that even if adopting a high-copper paste results in a small efficiency drop, the price trade-off should be acceptable to manufacturers. “That trade-off is acceptable if it does not introduce new reliability risks. Ultimately, the decision depends on how well the efficiency loss can be offset at the module and system level,” she told pv magazine.
Song’s team is currently working to identify practical pathways to reduce silver usage in PV cells, both through incremental improvements to existing screen-printed metallisation and longer-term exploration of alternative paste systems. “In the short term, aggressive silver thrifting within existing screen-printing processes is the most commercially ready option, as it minimises disruption to current manufacturing lines,” she stated.
“From a purely technical perspective, the most promising long-term solution is the one that delivers the best combination of low contact resistance, minimal recombination losses at the contacts, high conductivity, sufficient ductility to enable narrow, well-shaped grid lines with reduced optical shading, and robust long-term reliability,” she said. “That is regardless of the specific metal used.”
Author: Lior Kahana
This article was originally published in pv magazine and is republished with permission.






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