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					</table><p>Researchers at the Helmholtz-Zentrum Berlin (<a href="https://www.helmholtz-berlin.de/index_en.html" target="_blank" rel="noopener">HZB</a>) said that they have produced perovskite solar cells to achieve efficiencies of well above 24%, which are resistant to drop under rapid temperature fluctuations between -60 and +80 degrees Celsius over one hundred cycles.</p>
<p>The experiment findings correspond to about one year of outdoor use.</p>
<p>Perovskite semiconductors promise highly efficient and low-cost solar cells. However, the researchers said that the semi-organic material is very sensitive to temperature differences, which can quickly lead to fatigue damage in normal use.</p>
<p>The team of researchers identified that adding a dipolar polymer compound to the precursor perovskite solution helps to counteract this.</p>
<p>Additionally, the materials are cheap, can be processed into thin films with minimal energy input, and achieve significantly higher efficiencies than those of conventional silicon solar cells.</p>
<p><strong> </strong>&#8220;We optimized the device structure and process parameters, building upon previous results, and finally could achieve a decisive improvement with b-poly(1,1-difluoroethylene) or b-pV2F for short,&#8221; says Guixiang Li, a Ph.D. candidate.</p>
<p>b-pV2F molecules resemble a zigzag chain occupied by alternating dipoles.</p>
<p>Another researcher explained that this polymer wraps around the individual perovskite microcrystals in the thin film like a soft shell, creating a cushion against thermomechanical stress.</p>
<p>Scanning electron microscope images show that in the cells with b-pV2F, the tiny granules nestle a little closer.</p>
<p>In addition, the researchers informed that the dipole chain of b-pV2F improves the transport of charge carriers and thus increases the efficiency of the cell.</p>
<p>Solar modules are expected to provide stable output for at least 20 years in outdoor conditions while exposed to large temperature fluctuations. Silicon photovoltaics manage this efficiently, whereas the semi-organic perovskites lose performance relatively fast.</p>
<p>A researcher said that the sunlight could heat the inside of a photovoltaic cell to 80 degrees Celsius in the dark; the cell then cools down immediately to the outside temperature.</p>
<p>This triggers significant mechanical stresses in the thin layer of perovskite microcrystals, creating defects and even local phase transitions, so the thin film loses its quality.</p>
<p>The team, along with a few international partners, investigated a chemical variation that significantly improves the stability of the perovskite thin film in different solar cell architectures.</p>
<p>&#8220;Even under these extreme stresses, they still achieved 96 % efficiency in the end,&#8221; the researcher quoted above said.</p>
<p>If they can reduce the losses a little further, perovskite solar modules could still produce most of their original output after 20 years, a goal that is now coming within reach.</p>
<p>Recently, researchers at the Helmholtz-Zentrum Berlin (HZB) <a href="https://mercomindia.com/tandem-solar-cell-achieves-world-conversion-efficiency/" target="_blank" rel="noopener">said</a> they had achieved 32.5% conversion efficiency in tandem solar cells, the highest ever for this technology and a world record.</p>
<p>The teams from HZB had claimed to <a href="https://mercomindia.com/conversion-efficiency-perovskite-silicon-solar-cell/" target="_blank" rel="noopener">achieve</a> a record value in late 2021 with an efficiency of 29.8% in a tandem solar cell made of perovskite and silicon. The result was certified by Fraunhofer ISE CalLab. The researchers<a href="https://mercomindia.com/new-perovskite-silicon-tandem-solar-cell/" target="_blank" rel="noopener"> improved</a> upon their earlier conversion efficiency record of 29.15%.</p>
<div class="saboxplugin-wrap" itemtype="http://schema.org/Person" itemscope itemprop="author"><div class="saboxplugin-tab"><div class="saboxplugin-gravatar"></div><div class="saboxplugin-authorname"><a href="https://cms.mercomindia.com/author/gautamee-hazarika/" class="vcard author" rel="author"><span class="fn">Gautamee Hazarika</span></a></div><div class="saboxplugin-desc"><div itemprop="description"><div class="designboxt">
<p><img class="alignleft" style="border-radius: 50%;height: 50px;margin-top: -4px;border: 1px solid #00b451" src="https://mercomindia.s3.ap-south-1.amazonaws.com/wp-content/uploads/2022/10/Picture1.jpg" width="50" /></p>
<p><strong style="text-decoration: underline">Gautamee,</strong> Staff reporter at Mercom India<br />
<a href="https://mercomindia.com/author/gautamee-hazarika/" target="_blank" rel="noopener">More articles from Gautamee.</a><br />
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<a href="gautamee@mercomindia.com" target="_blank" rel="noopener">gautamee@mercomindia.com</a></p>
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<div class="authorboxn"><img class="alignleft" src="https://mercomindia.s3.ap-south-1.amazonaws.com/wp-content/uploads/2022/10/Picture1.jpg" width="102" height="102" /><a href="https://mercomindia.com/author/gautamee-hazarika/" rel="noopener">Gautamee</a> is a reporter at Mercom India. Prior to Mercom, Gautamee was working as a multimedia news journalist at ThePrint in New Delhi. She has received her Bachelors in English Honors and Masters in English Literature from St.Stephen&#8217;s College, University of Delhi.<a href="https://mercomindia.com/author/gautamee-hazarika/" rel="noopener">More articles from Gautamee</a></div>
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Perovskite Solar Cells Retain Efficiency During Temperature Fluctuations

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