IMAGE: Slot-die coating method used for large-scale fabrication of perovskite photo voltaic cells.
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Credit score: © 2020 KAUST

Superior ink formulations could possibly be the important thing to turning perovskite photo voltaic cells (PSCs) from heroes of educational labs into commercially profitable merchandise. Researchers at KAUST have developed a perovskite ink tailored for a mass manufacturing course of referred to as slot-die coating, producing PSCs that captured photo voltaic power with excessive effectivity. The ink is also coated onto silicon to create perovskite/silicon tandem photo voltaic cells that seize much more of the Solar’s power.

“PSCs have proven lots of promise in lab-scale work over the previous decade,” says Anand Subbiah, a postdoc in Stefaan De Wolf’s lab. “As a group, we have to begin wanting on the stability and scalability of PSC know-how,” he says.

PSCs made in analysis labs are usually made by spin-coating, which is unsuited to mass manufacture. Slot-die coating, in distinction, is a producing method used industrially for nearly 70 years. “The method includes constantly and exactly forcing an ink by way of a slender slit that’s moved throughout the substrate to type a steady movie,” Subbiah says. “This high-throughput method would enable for roll-to-roll fabrication, just like printing newspapers.”

To provide high-efficiency slot-die coated PSCs, the staff confronted a number of challenges. A few of the best-performing spin-coated PSCs mix the perovskite with a poly(triarylamine) (PTAA) transport layer, however PTAA is hydrophobic and extremely repellent to liquid perovskite ink. Including a surfactant to the ink formulation overcame the repellence, leading to higher high quality interface and movies and higher system efficiency, Subbiah says. The staff additionally switched the ink to a lower-boiling solvent, lowering ink drying time with out the necessity for additional processing steps.

General, the staff’s optimized slot-die coated PSCs captured photo voltaic power with as much as 21.8 p.c effectivity, a major enchancment over the 18.3 p.c beforehand recorded for PSCs made this manner.

Much more considerably, from a business standpoint, was that the ink may readily be coated onto textured silicon to supply a perovskite/silicon tandem photo voltaic cell, Subbiah says. “We have been additionally capable of make the very first slot-die coated silicon-perovskite monolithic tandem photo voltaic cell, recording a 23.8 p.c effectivity,” he says.

“The event of scalable deposition methods for perovskite photo voltaic cells is important to deliver this know-how from the analysis labs to the market,” De Wolf says. “Our subsequent steps are making large-area units and modules utilizing our developed know-how and testing their stability within the lab and the outside, whereas persevering with to enhance efficiency.”


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