Researchers at KAUST have developed a perovskite ink tailor-made for a roll to roll friendly mass manufacturing process called slot-die coating, producing PSCs that captured solar energy with high efficiency. The ink could also be coated onto silicon to create perovskite/silicon tandem solar cells.
High-throughput roll-to-roll fabrication would make printing solar cells in a similar process to printing newspapers.
Some of the best-performing spin-coated PSCs combine the perovskite with a poly(triarylamine) (PTAA) transport layer, but PTAA is hydrophobic and highly repellent to liquid perovskite ink. Adding a surfactant to the ink formulation overcame the repellence, resulting in better quality interface and films and better device performance, Subbiah says. The team also switched the ink to a lower-boiling solvent, reducing ink drying time without the need for further processing steps.
Optimized slot-die coated PSCs captured solar energy at 21.8 percent efficiency, a significant improvement over the 18.3 percent previously recorded for PSCs made this way.
The ink could readily be coated onto textured silicon to produce a perovskite/silicon tandem solar cell. The frstslot-die coated silicon-perovskite monolithic tandem solar cell had a 23.8 percent efficiency.
“The development of scalable deposition techniques for perovskite solar cells is essential to bring this technology from the research labs to the market,” De Wolf says. “Our next steps are making large-area devices and modules using our developed technology and testing their stability in the lab and the outdoors, while continuing to improve performance.”
The University of Washington and many others are working on roll-to-roll solar cell production.
Newspaper-like roll to roll printing is the goal for printing solar power.
Separate Research is Making Perovskite Solar More Durable
SOURCES – Soochow University, University of Washington, KAUST
Written By Brian Wang, Nextbigfuture.com
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