"We believe producing microLEDs on large-area 300 mm silicon wafers is a world's first, and opens this technology to huge potential-volume-manufacturing capabilities," said Giorgio Anania, Aledia CEO and cofounder. "The larger size allows 60-100 smartphone displays to be made on a single 300 mm wafer, versus approximately four-to-six using the present LED industry-standard, 4" sapphire substrate. Thanks to Aledia's unique nanowire LED technology (3D LED), this can be done with commercially available processes and equipment, since it uses standard-thickness (780 µm) silicon wafers."
Traditional planar, "2D" microLEDs are produced by depositing flat layers of gallium-nitride (GaN) crystal on sapphire wafers of 100-150 mm diameter (4-6"), with the majority of production today being on 100 mm (4") wafers. Aledia's microLED technology grows GaN nanowires (GaN crystals of sub-micron diameter) on top of large-area silicon (called "3D"). This 3D nanowire technology does not create any of the stresses seen on 2D chips, which build up as the wafer size is increased, and so allows the use of very large-size wafers. In addition, this silicon-based technology allows production in conventional microelectronics fabs, called silicon foundries, which can be ramped up to high volume production with extremely high yield.
"We are very pleased to have helped Aledia push forward the state of the art of 3D LED manufacturing using our 300 mm silicon processing line. We believe large-area silicon wafers are the best manufacturing platform in the world today for displays, and give big advantages in manufacturability," said Emmanuel Sabonnadière, CEO of CEA-Leti. "3D nanowire micro-LEDs have the potential to make serious penetration into large display markets. CEA-Leti is very active today in supporting the display industry's transition to micro-LED technology."
"We believe the use of large-area silicon wafers and microelectronics foundries are the only way to deliver the huge volumes demanded by end-user markets," Anania said. "For example, if only the large-screen TVs of 60" in diagonal and larger transitioned to silicon nanowire technology to obtain better image quality and lower manufacturing costs, this would require 24 million 300 mm wafers per year, volumes that can only be delivered by the silicon industry and supply chains. Smartphones, laptops and tablets would be on top of that."
Aledia's technology is protected by 197 patent families, making Aledia the leading French startup company in France in filed patents.
This work is sponsored by the EC: Grant Agreement number: 954553 — SPEED — H2020-EIC-SMEInst-2018-2020
Aledia develops and manufactures microLED displays and components to equip the $120 billion worldwide display market with next-generation technology. Its proprietary 3D microLED technology uses GaN nanowires on large-area silicon that emit light and can be used to manufacture state-of-the-art displays that deliver better performance at competitive prices compared to current OLED technologies. These improvements include longer battery life on mobile devices, better outdoor readability and faster refresh rates, as well as sharper colors. The company is targeting markets for smartphones, laptops and tablets, augmented reality displays and large TVs. Based in the Grenoble area in France, Aledia has 130 employees. It was spun out of CEA-Leti, the French microelectronics R&D institute, in 2012. -
About CEA-Leti (France):
Leti, a technology research institute at CEA, is a global leader in miniaturization technologies enabling smart, energy-efficient and secure solutions for industry. CEA-Leti pioneers micro and nanotechnologies, tailoring differentiating applicative solutions for global companies, SMEs and startups. CEA-Leti tackles critical challenges in healthcare, energy and digital migration. From sensors to data processing and computing solutions, CEA-Leti's multidisciplinary teams deliver solid expertise, leveraging world-class pre-industrialization facilities. With a staff of more than 1,900, a portfolio of 3,100 patents, 10,000 sq. meters of cleanroom space and a clear IP policy, the institute is based in Grenoble, France, and has offices in Silicon Valley and Tokyo. CEA-Leti has launched 65 startups and is a member of the Carnot Institutes network. -
Source: LED Professional