perovskite Archives - usatoday24

Perovskite is the “holy grail” of solar energy, but its industrial manufacturing was hell. This new technique changes everything at once

May 25, 2026 by usatoday24

Solar energy has a clear favorite to lead the future: tandem solar cells. The idea is brilliant and simple on paper, since if you combine traditional silicon with a top layer of revolutionary perovskite, you create a “super panel.” Perovskite swallows high-energy, short-wave light, and silicon finishes the job with longer waves. So the result is capturing much more solar spectrum and generating more electricity than with traditional plates. The valley of industrial death. The problem is that the photovoltaic industry had been banging its head against a wall for years. Perovskite was a wonder in the “Petri dish” of the laboratory, but manufacturing those very thin layers on a large scale, uniformly and quickly, was a true technical nightmare. Technology ran the risk of remaining an eternal promise, until a bridge built between Karlsruhe and Valencia showed that the problem was not the material, but the method. The 10 minute record. A team of researchers from the Karlsruhe Institute of Technology (KIT) in Germany and the University of Valencia, supported by institutions in France and Argentina, has just published a historic milestone in the magazine Nature Energy. They have designed an ultra-fast, solvent-free vacuum process that deposits the layer of perovskite at a pace never seen before. They have managed to manufacture tandem cells with a very high efficiency of 24.3% and the conversion process lasts just 10 minutes. To understand why this turns the industry upside down, you have to look at the factory numbers. As Professor Ulrich Paetzold (KIT) explainsIn the industry, not only efficiency matters, but also that the process is robust and scalable. This new method achieves a deposition rate of 47 nanometers per minute, that is, a speed ten times greater than that of conventional thermal evaporation methods. In addition, it consumes very little material and allows sources to be reused, drastically reducing costs. The “magic” of sublimation. The technique is called Closed Space Sublimation (CSS). We could say that it is like a microscopic oven: the precursor materials evaporate and collide directly against the silicon cell, which is placed just a few millimeters away. There they react on site to form the structure of the perovskite almost magically. Sofía Chozas-Barrientos, researcher at the University of Valencia, emphasizes that this system It allows you to do without solvents and save a lot of time. However, the recipe needed to be refined. For the tandem to work, the perovskite The upper part must act as a spectral filter (have a wider bandgap), and this is achieved by adding bromine. The drama was that, when trying to introduce bromine, it literally vanished during the process. The solution, according to researcher Alexander Dierckswas to create a mixed organic source by mixing methylammonium iodide and methylammonium bromide in an exact ratio of 3 to 1. Thus they managed to retain the bromine and nail an ideal band efficiency of 1.64 eV. Ready for the real world. The point is that good solar panels are not smooth; They are full of textures (with micropyramid shapes) to better catch the light. And this CSS process has worked perfectly on smooth, nanostructured and microstructured silicon, without having to touch a single button in the machine’s settings. Microscopes confirmed impeccable coverage in all topographies. As Professor Henk Bolink summarizesfrom the University of Valencia, a process that only works on smooth laboratory surfaces is of no use in industry. The fact that this sublimation achieves uniform layers on textured silicon is what makes this advancement real, viable and marketable. The future, on the roofs. Closing the gap between the laboratory and the factory is the great challenge of our energy era. With this Spanish-German milestone, the mass production of tandem solar technology finally removes the “unviable” label. The perovskite revolution no longer has to wait decades; is ready to make the leap to factories and, very soon, to rooftops around the world. Image | Eurekalert Xataka | Where you see an old bullet from the 17th century, Germany sees a magnificent source of perovskite for solar panels

Germany has found a source of perovskite for solar panels in an unusual place: bullets from the 17th century

April 11, 2026 by usatoday24

Solar energy is, with the permission of wind energy, the renewable energy that has stood out the most and best in the energy transition on a global scale. There are already solar parks everywhere: from fields that They fill the emptied Spain to deserts passing through the tibetan plateau and also in high seas either in lakes. And although the most common technology is crystalline silicon, perovskite is the great promise. There is a compelling reason to bet on perovskite: a record efficiency certified in a laboratory. up to 26%. However, a large-scale deployment of perovskite solar cells requires a large-scale, sustainable supply of high-purity lead iodide. We have come across lead: a toxic element whose mining is not exactly sustainable. On the not-so-good side, recycling it to the required purity levels is a technical challenge that a German research team at the Helmholtz Institute in Erlangen-Nuremberg has just solved. And in what way: have achieved converting 17th century musket balls into high-performance solar cells. The idea. It consists of a process of upcycling (upcycling) in two stages: first a non-aqueous electrochemical route and then purification through the crystallization of single crystals, quite different from traditional methods based on strong acids and large volumes of water. To demonstrate the robustness of their method, the team used lead bullets from the 16th and 17th centuries as raw material, a truly complicated material in that it contains carbon residues, metallic inclusions and oxidation patina. If the process can clean up this type of historical residue, it can handle virtually anything you throw at it (obviously any lead residue). Recycling bullets into solar cells transforms lead waste into a clean energy source. Why is it important. Perovskite solar cells require extraordinarily pure lead iodide, and achieving that level of purity from contaminated waste was until now a challenge without a practical solution that this research has solved: the team manufactured solar cells with their recycled material and obtained 21% efficiency, practically identical to the 22% of devices manufactured from industrial synthesis. Beyond the technical result, the process solves two problems at the same time: it offers a way to supply the enormous demand for lead iodide that will be generated by the take-off of perovskite solar cells without resorting to new mining and at the same time eliminates a toxic pollutant whose current management is expensive and environmentally problematic. Context. As we mentioned above, lead is an abundant waste: it comes from used car batteries, electronic scrap, construction materials or ammunition, among others. Lead recycling is dominated by car batteries, which have very high recovery rates in developed countries. The problem is in the rest: In 2018, only 48% of the world’s residual lead at the end of its useful life was recovered and in more dispersed flows such as electronics or construction, the recovery is even lower. Conventional recycling returns metallurgical-grade lead, useful for batteries and alloys, but far from what the solar industry requires. In addition, they are slow processes that generate toxic gases such as nitrogen oxides and large quantities of contaminated wastewater, up to 70 liters per kilogram of lead iodide produced. Traditional high-temperature purification methods are expensive and complex. More robust, adaptable and cleaner extraction and purification methods are needed for perovskite technology to truly scale. How they do it. The bullets are cleaned with dilute nitric acid, melted and molded into rods that act as electrodes in an electrochemical cell with acetonitrile and dissolved iodine. When current is applied, lead reacts directly with iodine and precipitates as lead iodide with 94% efficiency. Doing it this way, in a non-aqueous medium, is a deliberate decision to avoid introducing impurities that would accelerate the degradation of the perovskite. The resulting lead iodide still contains metallic impurities, so it is not suitable for solar cells. That is why it is subjected to a second purification stage through crystallization at a controlled temperature for about 70 hours. The process is exceptionally selective: as the crystal grows, it expels contaminating metals such as silver or copper, raising the purity of the material to levels comparable to or even higher than the highest quality commercial standard. Yes, but. The process works and the results are solid, but scale matters: at the laboratory level, productivity is just 0.05 grams per hour and each purification cycle lasts about 70 hours. The leap to an industrial scale requires solving the recovery of organic solvents, controlling the passivation of the electrodes and substantially improving the productivity of the process. The research team does not hide it: the chemistry is proven, but the distance from the laboratory to a real production plant is long and will determine whether we end up seeing perovskite panels made with recycled lead or if this remains like a shiny piece of paper in a drawer. In Xataka | Germany has had a crazy idea to solve one of the problems of renewables: covering a lake with solar panels In Xataka | 800 meters deep in a 175 million year old rock: Germany’s solution to nuclear waste Cover | By Branch and Soren H

The perovskite had been failing inside for years. The solution was in the octopuses

February 1, 2026 by usatoday24

For more than a decade, perovskite cells have been the great promise—and great frustration—of clean energy. In the laboratory they already compete with silicon, but they always failed in the same way: they degraded too quickly. Now, a discovery breaks with what is established. The solution has not come from a complex industrial machine, but from a molecule that octopuses and squid have been using for millions of years to protect themselves from chemical damage. The sabotage that comes from within. According to the study published in Advanced Energy Materialsthe problem is not just air or humidity, but a chemical reaction that is activated within the device itself. When sunlight hits the perovskite, highly energetic electrons are generated. These electrons can react with residual oxygen trapped during manufacturing—a process typically performed in air—to form superoxide radicals (O₂·⁻), extremely reactive chemical species. These radicals attack the organic cations that keep the perovskite crystalline structure stable, initiating its decomposition. The entry point. The damage does not begin on the visible surface of the panel, but in a key region known as the buried interface, the point of contact between the perovskite and the tin dioxide (SnO₂) layer, responsible for extracting the electrons generated by light. As emphasized Nanowerknot even the best external encapsulation can stop this process: oxygen is already present inside the device from the first moment. To further complicate the problem, tin dioxide itself contains oxygen-rich defects that, under illumination and heat, migrate into the perovskite and accelerate its degradation from within. Taurine to the rescue. Faced with this scenario, the team of researchers from the Daegu Gyeongbuk Institute of Science and Technology and the Korea Institute of Science and Technology opted for an unusual route in photovoltaic development: seeking inspiration in biology. The answer came in the form of an ultrathin layer of taurine, a sulfur amino acid present in octopuses, squid and other marine organisms. According to Interesting Engineeringin nature taurine protects cells from oxidative damage, just the same type of threat that was degrading perovskites. Located at the interface between tin dioxide and perovskite, the molecule functions as a smart chemical shield. A defense cycle that does not end. The study details, based on density functional theory (DFT) calculations and laboratory experiments, a two-step protection mechanism that is especially relevant. First, taurine intercepts superoxide radicals as they form. Its chemical structure, called zwitterionic—with positive and negative charges in different parts of the molecule—allows it to electrostatically attract these radicals and convert them into hydrogen peroxide, a much less aggressive species for perovskite. Secondly, the process addresses an additional problem: the molecular iodine generated during the degradation of the material. This iodine tends to form compounds that further accelerate the collapse of the structure. Taurine reduces that iodine back to iodide ions, chemically stable and much less harmful. Most notable, as Nanowerk points outis that after completing these reactions, taurine is regenerated. It is not consumed or degraded in the process, but rather returns to its original state, creating a closed radical neutralization cycle that can be repeated throughout the operational life of the device. From theory to real power. The benefits are not limited to durability. The presence of taurine also improves the electrical functioning of the cell. By chemically binding to both tin dioxide and perovskite, it acts as a molecular bridge that reduces defects at the interface, those small sinks where electrons are lost as heat. In practice, this translates into fewer electronic defects, nearly doubled electron mobility in the tin dioxide layer, and charges that survive longer. The best device achieved efficiency 24.8%, with 1.18 volts in open circuit and a high fill factor. Figures very close to current records, but with an important difference: it lasts much longer. In stability tests, taurine-treated cells retained 97% of their efficiency after 450 hours of continuous operation at 65°C. Under real ambient conditions, they maintained 80% of their performance for more than 130 hours, more than five times longer than conventional cells subjected to the same tests. The story has some scientific irony. While industry refined increasingly complex solutions, biology had already been solving the same problem for millions of years. If this strategy can be scaled and adapted to industrial manufacturing, the future of solar energy could depend as much on engineering as it does on biology. Sometimes, to move towards the Sun, it is enough to look at the bottom of the sea. Image | Unsplash and freepik Xataka | The dark side of solar energy: we are creating a 250 million ton mountain of garbage

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