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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