The article Perovskite solar cells: Tiny crystal seeds solve hidden errors first appeared in the online magazine BASIC thinking. With our newsletter UPDATE you can start the day well informed every morning.
Perovskite solar cells have long been considered a beacon of hope. But when scaling up, valuable percentages were usually lost. Researchers have now succeeded in reducing the loss of efficiency using tiny crystal seeds.
Researcher at the Qingdao Institute of Bioenergy and Bioprocess Technology (QIBEBT) of the Chinese Academy of Sciences published recently developed a new approach to perovskite solar cells. Using so-called CSV pre-seeding, they repaired microscopic defects on the hidden interfaces of the cells. The loss of efficiency when scaling to industrial dimensions was less than three percent and is lower than many previous reports.
Inverted perovskite solar cells arrange the layers so that the hole transport layer lies beneath the light-absorbing material. To improve adhesion, the scientists modified the substrate with self-assembled monolayers (SAM). These layers often have a water-repellent effect, which usually makes uniform wetting with the liquid perovskite solution considerably more difficult.
Perovskite solar cells: Rod-shaped crystals as a guide
The researchers used specially developed, rod-shaped nanocrystals with the chemical formula PDPbI_4-DMSO for the process. This rod-shaped structure improves the spreading of the solution on the SAM surface and controls the growth of the perovskite layer. They act like signposts on a construction site where the crystals grow faster and more orderly.
When heated, the material releases the embedded dimethyl sulfoxide molecules (DMSO) in a controlled manner. This process of lattice-bonded solvent annealing creates a local gas zone directly at the interface. It acts like a protective haze under which the crystal grains arrange themselves stably and close defects in the material.
The researchers combined CSV pre-seeding with an industrial slot die coating to produce a mini-module with an area of 49.91 square centimeters. The device achieved an energy conversion efficiency of 23.15 percent. Compared to small laboratory cells, the efficiency fell by less than three percent, which exceeds many previous research reports.
New principle for semiconductor technology
The process closes cavities at the interface and ensures smoother transitions between the individual crystal grains. This creates a dense layer that is much more resistant to stress caused by light or heat. This technology overcomes the long-standing bottleneck in the mass production of high-performance perovskite modules.
Beyond photovoltaics, the concept establishes a versatile approach to other semiconductors. By specifically adapting organic cations, the chemical building blocks that determine the properties of the material, a broad library of CSV materials can be designed. This enables precise control of interfaces in various optoelectronic components.
The new principle opens doors for the development of more efficient light-emitting diodes (LEDs) or sensors based on soft-grid semiconductors. The strategy allows control over deep layers of material that were previously difficult to access. The discovery thus paves the way for industrial production of high-tech components that follows a similar principle to fast printing processes.
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As a Tech Industry expert, I am intrigued by the potential of perovskite solar cells and the recent discovery of how tiny crystal seeds can fix hidden defects in these cells. This breakthrough has the potential to greatly improve the efficiency and longevity of perovskite solar cells, making them a more viable option for widespread use in the renewable energy sector.
Perovskite solar cells have already shown great promise in terms of their high efficiency and low cost compared to traditional silicon solar cells. However, they have been plagued by issues such as stability and defects that can limit their performance over time. The ability to use tiny crystal seeds to address these defects is a significant advancement that could make perovskite solar cells even more competitive with other forms of solar technology.
I believe that continued research and development in this area will be crucial for unlocking the full potential of perovskite solar cells and accelerating their adoption in the market. The tech industry should closely monitor these advancements and explore how they can be leveraged to drive further innovation in the renewable energy sector.Overall, I am optimistic about the future of perovskite solar cells and the role they can play in transitioning towards a more sustainable energy system.
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