Lab-made perovskite solar panel lasts nine months and loses 25% of its efficiency – pv magazine USA

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The researchers built and deployed an array of nine perovskite solar panels that showed little generation loss due to high temperatures and performed better over time than the researchers expected.

Dr. Chikao and other researchers at Japan’s National Institute of Advanced Industrial Science and Technology first created an optical absorption layer using a perovskite crystal structure in 1999. Nearly twenty-five years later , researchers are still working to stabilize solar degradation.

This time around, researchers from several universities in the Mediterranean built and deployed a perovskite solar panel that took about nine months. The panels degraded approximately 25% from their original output, before suffering catastrophic encapsulation failure. This led to mechanical failure of the panel, as the elements quickly wore down the perovskites.

Hand assembled perovskite solar panel.

The paper, Integration of perovskite solar panels based on two-dimensional materials in an autonomous solar farmdetails how the collaboration went to build a brand new 0.5m2 perovskite solar panels. The panels were made up of 40 individual “modules” (the authors use the term modules, we’ll use the term “cell”), with the array peaking at 261 watts output, while the individual cells varied in output from 25 to 35 watts. The authors reported that the 360 ​​solar cells, measured at 1 solar irradiation, had an efficiency of 12.5% ​​± 1.6.

The authors have also provided an additional document that details all the ingredients that go into making one of their solar panels, even including the electricity consumed during manufacturing (approximately 11.25 kWh). The panels were named “GRAPE” because the “PE” rovskite was supplemented with the “GRA”phene.

Solar panel rolling equipment pressing perovskite panel.

After rolling out in June, the panel peaked above 250 watts of output – as can be seen in the lower right, image C. The panel saw an immediate drop in output, followed by a steady month , then a slowdown, but fairly stable. decrease in peak production – down 20% – in January/February. At this point, the degradation of the outlet accelerated sharply and was followed by a complete failure of the stratification, allowing the entry of oxygen and water.

The team suggests that the lamination failure was due to their use of the low-temperature (85°C) laminate chosen to seal the solar cells into the panel frame. A low-temperature laminate was chosen as a means of avoiding damage to temperature-sensitive perovskites in the lamination process, since perovskite degradation is accelerated at higher temperatures.

A very interesting observation is that production losses were about zero when temperatures increased to 50°C, and beyond. According to the author, “unlike many semiconductors, in which the optical band gap (Eg) decreases almost linearly with increasing temperature associated with solar cell operation, halide perovskites have a positive correlation between optical bandgap and temperature.

The authors explain that the gains from increasing the optical bandgap were likely offset by a number of uncertain factors, which should be examined in future research. Usually at 50°C, one would expect the efficiency of a silicon solar panel to be down 7.5-15% from its peak output.

The nine solar panels were deployed in Heraklion, Crete.

Visible failure points in solar panels.

Nature Energy CC 4.0 JFW

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