Science & Technology

Researchers have discovered another way to isolate lead in perovskite solar cells

This film is intended to prevent lead from escaping from damaged perovskite solar cells.Credit: National Institute of Renewable Energy

Scientists at the National Institute of Renewable Energy (NREL) and Northern Illinois University (NIU) have succeeded in preventing lead from escaping from damaged perovskite solar cells. Research efforts are their latest research to address concerns about potential lead poisoning.

Light absorption layer Perovskite Sun cell Contains a small amount of lead. Encapsulating solar cells alone does not prevent lead leakage even if the device is damaged by harsh weather conditions such as hail storms. Instead, chemical absorption is key.

Researchers report that more than 99.9% of leaks can be captured. Their findings are published in the journal in an article entitled “Lead Absorbent Tape on Devices for Sustainable Perovskite Solar Cells”. Natural sustainability..

The authors are Fei Zhang, Jinhui Tong and Kai Zhu from NREL. NIU’s XunLi, Jianxin Wang and TaoXu.

“It’s worth developing an approach that can be applied to a variety of perovskite solar cell configurations,” Zhu said.

In 2020, some of the same researchers as Zhu reported a successful experiment to isolate lead if the perovskite cell was damaged. They developed lead-absorbing films, applied them to both sides of the cell, then crushed them with a hammer and cut them with a knife. Then the damaged cell was submerged in water. Scientists have discovered that the film prevented more than 96% of lead from leaking into the water.

Researchers elsewhere have followed key concerns and developed a resin that can be incorporated into perovskite solar cells. However, as NREL and NIU scientists pointed out, “these additional changes can complicate device manufacturing and configuration and limit device performance and scale-up.”

Instead, as the author stated in the paper, a better suggestion is to develop a durable, highly efficient lead-absorbing component that can be “conveniently attached” to perovskite solar cells as an accessory. ..

Scientists at NREL and NIU believe they have found a solution by using a tape-like chemical absorption approach that can be easily placed on either side of a perovskite solar cell. In a series of tests, the tape captured almost all lead leaks without compromising cell performance or operation. The tape consisted of a standard ethylene-vinyl acetate (EVA) film and a pre-laminated di (2-ethylhexyl) methanediphosphonic acid layer.

After damaging the perovskite Solar cell, Scientists conducted a series of tests to quantify how much lead escapes into the water. In one experiment, the average concentration of lead in water that fell on a damaged device was about 19.14 ppm. The tape lowered that number to 2.13ppb. Applying this number to the context, the Environmental Protection Agency believes that water can be safely drunk when the lead content is less than 15 ppb.

“Because EVA is widely used as a cost-effective and durable encapsulation material for silicon-based solar panels, the integration of lead-absorbing materials and EVA provides stand-alone components ready for industry. , Perovskite solar cells“Xu said.

Scientists Find Ways to Stabilize Promising Materials for Solar Panels

For more information:
Xun Li et al, On-Device Lead Absorbent Tape for Sustainable Perovskite Solar Cells, Natural sustainability (2021). DOI: 10.1038 / s41893-021-00789-1

Quote: Researchers have obtained a perovskite solar cell from on October 29, 2021 (October 29, 2021). Discovered another way to isolate lead in

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Researchers have discovered another way to isolate lead in perovskite solar cells Researchers have discovered another way to isolate lead in perovskite solar cells

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