Leading-edge PV equipment supplier, SoLayTec has secured an order from US-based PV manufacturer, Mission Solar Energy for its InPassion ALD tool that will be used in production for N-type silicon bifacial solar cell production.
SoLayTec noted that this was the first order it had received for a US-based manufacturer and demonstrates that backside aluminum oxide (Al2O3) surface passivation technology is becoming the de facto choice to boost conversion efficiencies on N-type mono solar cells.
Roger Görtzen, co-founder of SoLayTec said: “At the start of our operations SoLayTec mostly aimed towards PERC solar cell technology based on mono and multi crystalline silicon. This turned out to be successful and in addition our customers now start to use ALD Al2O3 of SoLayTec for multiple high efficiency solar cell concepts like IBC, PERT and bifacial. At the upcoming conference WCPEC-6 in Kyoto Japan, in November 2014, our research partner IMEC will present the latest world record n-PERT (Passivated Emitter, Rear Totally diffused) cells with solar cell efficiency of 21.5% for large area c-Si n-type PERT solar cells. SoLayTec’s ALD layers are proven to reach 0.3% higher efficiency compared to thermally grown WetOxide.”
Mission Solar is currently expanding capacity from 100MW to 200MW.
Leading Taiwanese merchant solar cell producers have also adopted ALD technology to produce next generation PERC solar cells.
“When we started supplying our machines for mass production, the main focus for SoLayTec was reaching the highest throughput and best uptime. Also essential is the cost reduction of the expensive TMA precursor material. Most recently, we have implemented the most cost effective TMA recipe at one of our main customers in Asia. At this stage the ALD Al2O3 from SoLayTec consumes a factor 4-5 less compared to competing technologies like PECVD AlOx,” added Görtzen.