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After 16 brutal thermal cycles, the cells were found to be efficient, while standard cells failed faster.
In space, satellites face brutal temperature shifts from hot sunlight to freezing shadows.
For the next generation of solar panels, this thermal fatigue is a huge technical challenge. 
Now, a team of chemists at Ludwig Maximilian University of Munich has found a way to knit these solar cells together at the molecular level, creating a shield that keeps them from shattering in the void.
After 16 brutal thermal cycles (-80°C to +80°C), the cells retained 84 percent of their original power, while standard cells failed faster.
Perovskite solar cells are popular because they are inexpensive to manufacture and perform incredibly well. However, these cells have one major physical flaw that makes them easy to break.
When temperatures shift rapidly, the cell’s layers expand and contract at different rates.
In Low Earth Orbit (LEO), temperatures swing rapidly between -80°C (-112°F) and +80°C (176°F), causing internal layers to expand and contract at different rates. 
This thermal cycling generates severe mechanical stress, leading to microscopic cracks, layer peeling (delamination), and a swift decline in power output. 
Led by Dr. Erkan Aydin at LMU Munich, researchers have developed a dual-reinforcement strategy to shield perovskite solar cells from the brutal temperature swings of LEO. 
It combines two molecular approaches. The team stabilized both the internal grain structure and the interfaces where the solar cell meets its substrate. 
The Aydin team’s reinforcement strategy uses a dual-action molecular “glue” to fortify the solar cell’s weakest points. 
Infusing the perovskite layer with alpha-lipoic acid creates a polymer network that weaves through the material’s grain boundaries, preventing internal cracking. 
Simultaneously, they apply a specialized molecule, DMSLA, that uses a sulfonium group to form a powerful chemical anchor between the perovskite and the electrode. 
This combined approach acts as a flexible, protective net that keeps the cell’s layers intact even as they expand and contract under thermal stress.
“We can think of these molecules as a flexible, anchored net,” explained Aydin. “They keep the perovskite light-absorbing layer integrated with the substrate, allowing it to adapt to temperature changes while preventing delamination.”
The dual-molecular-anchored net technique boosted the efficiency of perovskite solar cells to 26 percent. Interestingly, it outperformed standard models while improving their survival rate in extreme environments.
Under rigorous testing — cycling between -80°C (-112°F) and +80°C (176°F) — these reinforced cells retained 84 percent of their power, successfully overcoming the thermal expansion and delamination that typically destroys such materials in space. 
The study reveals that while the initial cycles are the most damaging, this molecular reinforcement provides the long-term structural integrity needed for high-altitude platforms and deep-space missions.
“Our work shows it’s possible to improve the mechanical stability of perovskite solar cells in a targeted manner when you address the critical interfaces and grain boundaries in the material. This brings us one step closer to the practical use of this technology,” said Aydin.
The research team in Munich is now focused on refining these “space-ready” solar cells to withstand the most hostile environments known to science.
It could lead the way for high-performance, lightweight photovoltaics that can thrive on everything from orbital satellites and stratospheric aircraft to the next generation of flexible solar modules.
The findings were published in the journal Nature Communications.
Mrigakshi is a science journalist who enjoys writing about space exploration, biology, and technological innovations. Her work has been featured in well-known publications including Nature India, Supercluster, The Weather Channel and Astronomy magazine. If you have pitches in mind, please do not hesitate to email her.
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