“Working experience and research in the Nakamura research team is very helpful for their future work in the industry. These research experiences are actual and used in the work.†When talking about the experience of the Nakamura research team, Chen Dr. Zhen said.
After leaving the laboratory in Nakamura, Dr. Chen Zhen joined a US LED company and produced prototype LED devices on silicon substrates. "When we saw that the brightness of the first prototype device reached 50% of sapphire, we judged that the technical route of silicon substrate is feasible. Later I learned that China's crystal energy photoelectric is also making silicon substrate LED devices. It has been industrialized as early as 2009. As a technician, I deeply understand the difficulty of long LED materials on silicon substrates, and China has produced such a remarkable technology, and is ahead of other global manufacturers, plus For the pursuit of LED technology, I joined the crystal energy."
The next technique is competition for use <br> <br> current from the substrate material, in addition to Cree silicon carbide substrate, polycrystalline silicon substrate can be employed (Si), the vast majority of chip manufacturers in the world A sapphire substrate is used. Several major international companies are also vigorously following up on silicon substrate high-power LED chip technology. For example, Toshiba purchased Puri technology and cut it into silicon substrate. Samsung announced that its next year's technology route and products are silicon substrate chips. Various market signs and technology trends indicate that silicon substrates will be the next competitive technology in the LED field.
When talking about how the silicon substrate can open up a new world in the case of a sapphire substrate monopolizing half of the country, Dr. Chen Zhen is very familiar with introducing the advantages of silicon to reporters. He said that the first is the advantage of the substrate material itself. Silicon substrate materials are characterized by low cost, large size, and electrical conductivity. Silicon substrates are more suitable for large-scale epitaxy than sapphire. When the sapphire substrate technology is changed from 2 inches to 6 inches and 8 inches, the technical barriers are very high, and the production cost is not lowered. Silicon substrates, on the other hand, can be fabricated in large sizes, from 2" to 6" or even larger, to avoid edge effects and greatly increase yield. The silicon integrated circuit industry continues to increase the substrate size, from 8 inches to 10 inches, and even 12 inches. In addition, the advantages of the device structure. The silicon substrate LED is a vertical structure and emits light on one side, so that the spot of the LED of the silicon substrate is good, the direction is easy to control, the current is fast, and it is suitable for driving at a large current. Good thermal conductivity allows for better heat dissipation in the fabricated LED devices.
For the low-power silicon substrate LED chip, one metal wire can be used for packaging, and the electrode occupies less light-emitting area and higher reliability, so it has a relatively large market for small chips that need dense arrangement in digital and display fields. The advantage of the product has entered the Volkswagen and other brands for the backlight of the dashboard.
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