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Cornell University Scientists Solve Biggest Problem of Perovskite Solar Cells: Durability.
A group of scientists from Cornell University in the United States has developed a technology capable of solving one of the biggest challenges of solar energy: the fragility of perovskite solar cells.
The new solution consists of a two-dimensional protective layer that not only protects the cell against environmental degradation but also achieves a record efficiency of 25.3% in converting sunlight into electricity.
The results were published in the scientific journal Joule and mark an important advance towards the commercial viability of this lighter and more accessible alternative to traditional silicon.
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Reinforced Protection for the Sensitive Structure of the Solar Cell
Perovskite solar cells are seen as the next generation of photovoltaic energy, but their instability under light, humidity, and heat has limited their application on an industrial scale.
The innovation led by Professor Qiuming Yu and PhD student Shripathi Ramakrishnan introduces a 2D layer that acts as a kind of shield for the fragile 3D structure of the solar cell.
This special coating significantly increases the durability of the material, which is essential for real-world applications in solar panels.
With this protection, the devices resist accelerated aging, maintaining 95% of their performance even after nearly 50 days in extreme conditions simulating the natural environment.
Chemical Approach Redefines Perovskite Stability
Until now, most attempts to enhance the durability of perovskite solar cells used methylammonium (MA) as a structural base.
Although it provided good conductivity and efficiency, this compound showed rapid degradation when exposed to solar radiation.
“With MA, you have good efficiency and charge transport, but the solar cell degrades quickly within a few hundred hours of continuous operation,” detailed Ramakrishnan.
To overcome this limitation, scientists turned to formamidinium (FA), a more resistant material. However, the larger size of FA introduced an internal strain that complicated the formation of a stable layer.
The solution was to use carefully selected organic ligands to align the molecular structure of the cell without causing excessive distortions.
Crystal Lattice Compatibility: The Key to Success
The concept of “crystal lattice compatibility” was essential for the development of this next-generation solar cell. The idea was to balance opposing forces: while the FA tends to expand the structure’s lattice, the 2D ligand tends to compress it.
By selecting a ligand that did not impose excessive compression, the team was able to accommodate the FA cation in a stable and functional manner.
“The basic idea is that a ligand in a 2D perovskite tries to shrink the lattice, while the FA cage cation works to expand it, and you have these two opposing forces at play. We specifically chose a ligand that does not overly compress the cage, allowing for slight expansion to accommodate the larger FA cation,” explained Ramakrishnan.
Laboratory Tests Confirm High Efficiency and Resilience
The new configuration was analyzed using advanced techniques such as synchrotron X-ray diffraction and photoluminescence mapping.
The results confirmed the device’s high performance, which not only resisted environmental adversities but also showed excellent energy conversion capabilities.
According to the scientists, this perovskite solar cell model achieved an efficiency of 25.3%, a highly competitive rate even compared to the most modern commercial silicon cells.
More Accessible and Sustainable Solar Energy on the Horizon
For Professor Yu, the discovery could significantly accelerate the advancement of photovoltaic technologies:
“Silicon took about 50 years to get to where we are with solar energy. Perovskite has not yet had 50 years, but we can speed up this progress by understanding it at the molecular level and applying what we have learned.”
With this innovation, perovskite solar cells become an even more promising alternative to diversify the global energy matrix.
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