Scientists from the National University of Singapore, Zhejiang Jinko Solar Co. Ltd., and partner institutes have introduced a new molecular approach to improve next-generation solar cells, according to findings published in Nature Energy.
The team used a compound called 2-mercaptobenzothiazole in perovskite layers, a step that is now gaining attention for enhancing the performance of advanced tandem solar technologies.
Solar energy has long been seen as one of the cleanest ways to produce electricity. It does not pollute the air and depends on sunlight, a resource available in abundance. Most solar panels used today rely on silicon. These panels are dependable, but researchers continue to search for materials that can lower costs and improve efficiency.
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Perovskite has emerged as one of the most promising alternatives. In recent years, it has gained global attention because of its strong ability to absorb sunlight. It also offers the potential for lower production costs. However, perovskite comes with a drawback. It is less stable than silicon and tends to degrade faster when exposed to heat, moisture, or intense light.
To address this, scientists have been developing tandem solar cells. These devices combine silicon and perovskite layers, stacking them together to capture more sunlight and convert it into electricity more effectively.
Despite their potential, tandem solar cells have faced challenges. Efficiency and long-term stability have remained key concerns.
One major issue lies in how the perovskite layer forms during manufacturing. When perovskite is deposited on silicon wafers, it tends to crystallize too quickly. This happens because silicon conducts heat very efficiently.
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Rapid crystallization leads to defects in the material. Tiny gaps, known as voids, can form within the layer. At the same time, the chemical components inside the perovskite may separate unevenly. These flaws reduce the efficiency of the solar cell and affect its durability.
Researchers needed a way to slow down and control this crystallization process. This is where the newly introduced molecule plays a crucial role.
The team found that 2-mercaptobenzothiazole acts as a regulator during perovskite layer formation. It slows crystallization, allowing the material to form more uniformly and in a more controlled manner.
The researchers explained that thin silicon wafers used in these cells transfer heat very quickly during fabrication. This rapid heat flow accelerates crystallization and degrades the quality of the perovskite film.
They added that the molecule interacts with the perovskite components in two different ways. This dual interaction helps control crystal growth, resulting in a smoother, more stable structure.
By slowing down crystallization, the researchers achieved several improvements. The perovskite layer became more uniform. Defects like voids were reduced. Chemical separation inside the material was also controlled. These changes directly impacted performance.
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The team reported that their approach reduced energy losses inside the solar cell. Specifically, it reduced what scientists call non-radiative recombination, in which energy is lost rather than converted into electricity.
They also reduced the trap-assisted recombination rate significantly from 3.2 × 10⁵ to 4.3 × 10⁴ cm s⁻¹. This means fewer charge carriers were lost during operation, leading to higher efficiency.
The improved tandem solar cells achieved a certified power conversion efficiency of 32.76%. This is a high value compared to many existing solar technologies.
Efficiency, in simple terms, is the percentage of sunlight that a solar cell can convert into usable electricity. A higher percentage means better performance.
But efficiency alone is not enough. Stability matters just as much. The researchers tested their solar cells under continuous operation for more than 1,700 hours, roughly over two months.
Even after this long period, the cells retained 91% of their original efficiency. This shows that the molecular approach not only improves performance but also enhances durability.
Solar Cell Efficiency: Why This Matters
This development addresses a problem that many scientists had overlooked. The interaction between silicon wafers and perovskite layers during manufacturing was not fully understood before. This study highlights how heat transfer affects crystallization and overall device performance.
By solving this issue, the researchers have opened new possibilities. Their method can potentially be applied to other types of tandem solar cells as well. It is not limited to just one specific design.
This could make it easier to scale up production and move closer to commercial use.
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Silicon-perovskite tandem solar cells are often seen as the future of solar energy. They combine the stability of silicon with the high efficiency of perovskites.
However, durability and manufacturing challenges have slowed their adoption. This new approach offers a practical solution.
By using a simple molecular additive, scientists have improved both efficiency and stability without making the process overly complex. The research team believes their work provides important insights for integrating perovskite technology into existing silicon-based systems.
As the world looks for cleaner energy sources, improving solar technology remains a top priority. Small innovations like this can have a big impact. A tiny molecule, carefully introduced, has helped solve a major challenge in advanced solar cells.
If such improvements continue, highly efficient and long-lasting tandem solar panels may soon become a common sight. And that could bring us one step closer to a more sustainable energy future.
