Scientists consider 3 ways to expand perovskite solar cells

January 16, 2021

Scientists consider 3 ways to expand perovskite solar cells

Perovskite solar cells have improved their efficiency record in 10 years, and now their technology has become more stable. Researchers at the US Department of Energy's National Renewable Energy Laboratory (NREL) believe that the main challenges of perovskite solar cells are poor scalability issues. How to mass-produce and push technology outside the laboratory, they carefully summarized several potential extended deposition methods.

The perovskite solar cell's growth record of conversion efficiency is faster than any solar cell technology, and it has now reached 22.7%. Because the process is much cheaper, they show considerable commercial potential in the laboratory and are the next generation of solar cells. The cutting-edge rookie.

However, as researchers increased the area of ​​battery modules, the efficiency of perovskite solar cells began to decline, and there were many declining factors, such as non-uniform coating of chemical substances in batteries. The most commonly used method in the laboratory to fabricate perovskite solar cells is spin coating. The researchers deposit chemical substances on the substrate. Perovskite materials are formed during chemical crystallization.

However, this method wastes more than 90% of the chemical, perovskite ink, and the spin coating method works best in areas less than 4 square inches. There is no simpler method for larger surfaces.

To this end, NREL researchers proposed three other potential scalable deposition methods: blade coating, Slot-die coating, and Ink-jet printing. .

The doctor blade method uses a blade to push the chemical solution onto the substrate to form a wet film. This process is suitable for roll-to-roll manufacturing. The flexible substrate moves on the lower roller of the stationary blade, similar to newspaper printing. This technology wastes the perovskite. Ink is less than spin coating.

The precision slot coating method has not been sufficiently studied in comparison with other technologies and is currently less efficient than the blade coating method, but in the future, its reproducibility may be better than the blade coating method, and is more suitable for roll-to-roll production.

The inkjet printing method uses a small nozzle to disperse the leading ink. At present, this technology has been applied to small solar cells, but whether it is suitable for mass production depends on the printing speed.

Several studies have estimated that perovskite solar cells can generate electricity at a lower cost than other photovoltaic technologies (though these data are currently only hypotheses), but a conclusion drawn from these studies is that the highest cost of perovskite module input will come from the With electrode materials, there is a series of innovation opportunities in this field.

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