Mini perovskite solar module with stabilized efficiency of 11.9% – pv magazine International

An international research group has developed a perovskite solar panel on an area of ​​192 square centimeters. The researchers say the panel has one of the highest efficiencies reported to date at this size.

Researchers fabricated a perovskite solar module on a substrate with a total substrate size of 20 cm × 20 cm and a stabilized power conversion efficiency of 11.9%.

“This is one of the highest reported in the literature so far at this size,” said researcher Luigi Angelo Castriotta. photo magazine. “We believe that by optimizing laser processes, we can improve module efficiency by around 50 percent.”

The scientists used the P1, P2 and P3 models to interconnect the perovskite solar cells, so that they could then be transformed into mini photovoltaic modules.

P1 isolate substrate connections between adjacent cell while P2 and P3 isolate the active part and the top electrode of adjacent cells, respectively,” the researchers explained, noting that their approach involves the reduction of cell-module losses that arise due to laser processes.

The P3 stage is often a source of undesirable effects such as back contact delamination, spalling, or poor electrical insulation, due to residue remaining in the trench. These problems are likely due to interactions between the laser and the material that have not been fully understood to date.

The solar panel reaches an output power of 2.3 W on a 192 cm2 region.

“Optimizations of all modules started from studying optimization P1, P2 and P3, followed by refinement of cell area width and adjustment of geometric fill factor”, have the scientists said, adding that the proposed fabrication technique could be applied to modules fabricated with flat die coating, blade coating or other deposition techniques.

They described the mini perovskite module in “Reducing Losses in Perovskite Large Area Solar Technology: Laser Design Optimization for Highly Efficient Modules and Minipanelswhich was recently published in Advanced Energy Materials. The research group includes scientists from the University of Rome Tor Vergata and the Institute of the Structure of Matter ISM – CNR in Italy, Greatcell Italy, and Technical University Dresden in Germany.

In March 2021, the University of Rome Tor Vergata presented a perovskite solar module with a total active area of ​​42.8 cm2 and an aperture area of ​​50 cm2. The panel was constructed with 20% efficient perovskite cells connected in 14 series. It was able to maintain 90% of the initial efficiency after 800 hours of thermal stress at 85 C.

Later in June, it unveiled a perovskite solar module with cells made from cesium methylammonium formamidinium triple cation (CsMAFA).

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