The research focused on lead halide perovskites, crystals used in LEDs, solar cells, and medical imaging.
Researchers at Michigan State University have developed a novel method to control the location and timing of crystal growth precisely. This could help many advanced technologies, such as solar panel s, LED lighting, and medical imaging.
The development involved hitting gold nanoparticles with just one laser pulse.“With this method, we can essentially grow crystals at precise locations and times,” said Dr. Md Shahjahan, a research associate at MSU and first author of the paper. “It’s like having a front-row seat to watch the very first moments of a crystal’s life under a microscope, only here we can also steer how it develops,” Shahjahan added in the press release on October 14. A birds-eye view of Harel’s laser lab at MSU. Paul Henderson, Finn Gomez / College of Natural ScienceUse of fast laser pulses A solid material is a crystal when constituent particles are arranged in a continuous, highly ordered, three-dimensional structure.Crystals are a key part of many technologies, powering everything from smoke alarms and TVs to ultrasounds and sonar.Growing high-quality crystals presents a major challenge because the formation process is unpredictable. When using conventional, crystals tend to nucleate and grow in random times and places. Nowadays, the advancing technological devices demand exceptionally high-quality crystals placed precisely. This lack of control is a major obstacle to improving materials and devices.The team tackled this challenge using fast laser pulses. The research focused on lead halide perovskites, crystals used in LEDs, solar cells, and medical imaging.They skipped the typical complicated growth steps and aimed the laser at a tiny target: gold nanoparticles smaller than one thousandth the width of a human hair.The key discovery was that the laser light striking these nanoparticles generated heat. This heat then initiated the crystallization process for materials like lead halide perovskites.The scientists could even watch the process happen instantly thanks to their special, high-speed microscopes.Diverse applicationsThis novel method of crystal creation offers researchers unprecedented control, allowing them to “draw” crystals much like a laser engraves metal or wood. The capability is expected to transform diverse fields, from clean energy solutions to advanced quantum technologies.“We’re just beginning to scratch the surface of what’s possible. This is opening a new chapter in how we design and study materials,” said Elad Harel, associate professor in the Department of Chemistry and senior author of the study. Apart from technological applications, the findings provide fresh insights into how crystals form — a tricky and often mysterious area of chemistry.With the success of the gold nanoparticles, the team is now focused on future experiments with big potential. The next steps include using multiple, different-colored lasers to create more intricate crystal patterns and attempting to synthesize entirely new materials that are impossible to make conventionally. Ultimately, they plan to create more complex patterns and test the crystals in real-world devices.The study was supported with funding from the U.S. Department of DefenseThe findings were reported in the journal ACS Nano on October 14.
Crystal Growth Energy &Amp Environment Halide Perovskites Inventions And Machines Laser LED Lighting Solar Panel
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