Introducing a Groundbreaking Laser-Diode Floating Zone Method
A collaborative effort between German and Japanese scientists has led to a significant breakthrough in semiconductor crystal production, a key component for electric vehicles and solar energy systems. Researchers from the Fraunhofer Institute for Laser Technology ILT in Aachen, Germany, and the National Institute of Advanced Industrial Science and Technology (AIST) in Tsukuba Science City, Japan, have developed an innovative laser-based method that streamlines the production of high-purity semiconductor crystals, crucial for powering the future.
A Leap Forward with Laser Technology
This new technique dubbed the laser-diode floating zone (LDFZ) method, utilizes a formidable 20 kW laser alongside a specially designed optical system perfected by the Fraunhofer ILT team. This method stands out by eliminating the traditional need for crucibles, thereby significantly reducing the likelihood of crystal contamination. By applying heat directly through radiation, the process transforms polycrystalline material into single crystals of unmatched purity.
The precision control provided by the laser beam allows for the targeted application of heat, ensuring the production of larger and purer semiconductor crystals. The optical system, engineered to handle the demands of high laser power through water cooling, guarantees uniform heating of the crystals during their growth phase.
Advancements and Achievements
With this new 20 kW system, the team aims to increase the diameter of the crystals produced dramatically. Early experiments have yielded promising crystals up to 30 mm in diameter – a record for crucible-free methods. These advancements are expected to make substantial contributions to the semiconductor crystal production field, with detailed results eagerly anticipated.
Dr. Martin Traub, project leader at Fraunhofer ILT, shared his enthusiasm for the system’s successful deployment, highlighting the innovative use of video conferencing for installation and testing during pandemic-related restrictions. The LDFZ method has already shown its potential by producing gallium oxide crystals with diameters reaching 12 mm at lower laser powers.
Conclusion: Paving the Way for a Brighter Future
This collaboration marks a pivotal development in semiconductor technology, offering enhanced performance and efficiency for power electronics in electric vehicles and renewable energy solutions. The laser-diode floating zone method represents a technological achievement and a promising path forward for the sustainable technologies that will drive our future.
