Imec Si PV cell exhibit 20.1% efficiency

Imec, RENA, a supplier for wet chemical production tools, and SoLayTec, have developed a 160?m, 156 x 156mm industrial PERC-type silicon solar cell that achieved an efficiency of 20.1 per cent and open circuit voltages up to 655mV. The solar cells were created on Imec's silicon solar cell pre-pilot line using RENA's InPilot tool for rear-side polishing and emitter removal, and SoLayTec's spatial ALD tool for Al2O3 deposition. When applying Cu-plated contacts at the front instead of silver screen printed contacts, a top efficiency of 20.6 per cent was reached.

"Routinely achieving average conversion efficiencies around 20 per cent, Imec's industrial PERC pre-pilot line enables the development and validation of novel solar cell processes and concepts, and serves as an excellent platform for system suppliers to benchmark their new tools," said Joachim John, photovoltaic R&D projects responsible at Imec. "This supports the acceleration of process implementation in next generation high-throughput solar cell manufacturing."

Roger Gortzen, manager marketing and sales and co-founder of SoLayTec: "Achieving a factor three less TMA precursor usage without effecting the cell efficiency on Imec's silicon PV processing facilities proves that our novel ALD Al2O3 passivation process, aiming at lower cost of ownership without effecting the cell efficiency, is ready to be implemented in an industrial environment."

Franck Delahaye, product manager solar at RENA: "Collaborating at Imec with partners across the value chain enables us to benchmark our tools on the highest performance levels. This way, we can verify the impact of our single tools on the overall cell performance and make sure to offer solutions with a strong positive leverage on the costs per watt. Further, this deepens our understanding of the respective interaction between the process steps and strengthens our ability to support and lead overall process integration at our customer's facilities."