Metallisation paste advances boost efficiencies for REC modules

Singapore-based REC Solar and DuPont Microcircuit Materials, a key developer of metal pastes for the PV industry, have recently announced that DuPont’s new ‘Solamet PV18x’ series of metallisation pastes have been instrumental in raising the peak power performance (Pmax / Wp) of REC Solar’s multicrystalline modules to new record levels.

 “REC solar panels now deliver more power per square metre due to several design improvements, including the use of the newest frontside metallisation paste provided by our premier innovation supplier, DuPont,” said REC’s Senior Vice President, Operations and Technology, Ter Soon Kim.

The breakthrough is a result of a 4-year collaboration between DuPont and REC, who have been working on optimising the performance of metallisation pastes at REC’s manufacturing facility in Singapore.

DuPont has claimed that its customers have been able to achieve 265 Wp in routine production – the highest average production level reported thus far. The maximum power performance of REC’s ‘Peak Energy’ 60-cell module series currently stands at 260W.

While results are yet to be announced on average production figures, earlier projections from REC suggest that the fraction of their 60-cell modules with peak power of 250W or more may be up to 95% as of Q4 2013 – up from 55% just a year earlier.

REC solar module efficiency

Photo Courtesy: PVTech

REC had previously reported that its multi-crystalline cell efficiencies have gone up from 16.8% in 2011 to 17.1% in 2012, with financial statements suggesting ongoing efforts to improve module efficiencies by optimising performance of the front and rear-sides of the cell, which – in this case –were enabled by optimising the cell metallisation.

Metallisation is an important step in the cell manufacturing process and is critical to creating electrical contacts to the underlying silicon, thereby allowing power to be extracted from the cell. Metallisation is also important from a cost standpoint as it involves the use of pastes made of expensive metals such as silver and aluminium, all of which add to the final cost of a module.

Due to increasing pressures on the PV industry to cut costs, manufacturers have been pressed to find ways to reduce the amount of silver applied per cell while at the same time develop a metal paste that is compatible with higher-efficiency solar cell structures. DuPont has managed to strike this fine balance through its well-known Solamet series pastes, the latest of which offers a 3-3.5% relative efficiency improvement over conventional pastes.

DuPont Solamet PV18xPhoto Courtesy: DuPont

Such seemingly small but steady gains are key to maintaining the PV industry’s growth trajectory. According to Peter Brenner, Global PV Marketing Manager of DuPont, “Constant innovation in Solamet pastes has been instrumental in ensuring the efficiency improvements and cost effective measures that are moving the solar industry toward grid-parity”. Mr. Brenner also added that “[c]ollaborations with leading companies like REC are critical to the quick delivery of new and improved technologies that fuel further growth in the industry, and for our customers.”

© 2014 Solar Choice Pty Ltd

Nitin Nampalli

Nitin is a regular contributor to Solar Choice News with a focus on solar PV technology. He holds a Master of Engineering Science in Renewable Energy from UNSW and a Bachelor of Science degree in Microelectronic Engineering from Rochester Institute of Technology, New York. He is currently a PhD candidate researching solar photovoltaics at UNSW. In addition to his studies, he has also worked extensively in solar PV research.
Nitin Nampalli