The basic principle of epitaxial growth is that a gaseous substance, InGaAlP, is controlled to be transported to the surface of the substrate to grow a specific single crystal film on a substrate substrate (mainly sapphire and SiC, Si) heated to a suitable temperature. At present, the LED epitaxial wafer growth technology mainly adopts an organometallic chemical vapor deposition method.
Introduction to MOCVD:
Metal-Organic Chemical Vapor Deposition (MOCVD), a new technology for preparing compound semiconductor single-film films proposed by Rockwell Corporation in 1968. This equipment integrates precision machinery, semiconductor materials, vacuum electronics, fluid mechanics, optics, chemistry, and computer multidisciplinary. It is a state-of-the-art optoelectronic special equipment with high degree of automation, high price, and high technology integration. It is mainly used for GaN ( The epitaxial growth of GaN-based semiconductor materials and the fabrication of blue, green or ultraviolet light-emitting diode chips are among the most promising specialized devices in the optoelectronics industry.
LED chip manufacturing process:
Epitaxial wafer→cleaning→plating transparent electrode layer→transparent electrode pattern lithography→corrosion→debonding→platform pattern lithography→dry etching→degraction→annealing→SiO2 deposition→window pattern lithography→SiO2 corrosion→degglomerate→ N-pole pattern lithography → pre-cleaning → coating → stripping → annealing → P-pole pattern lithography → coating → stripping → grinding → cutting → chip → finished product testing.
In fact, the production process of the epitaxial wafer is very complicated. After the epitaxial wafer is finished, the next step is to make the electrode (P pole, N pole) of the LED epitaxial wafer, and then start cutting the LED epitaxial wafer with a laser machine (previously cutting LED epitaxial wafers are mainly made of diamond knives. After being fabricated into chips, nine points are taken at different positions on the wafer for parameter testing, as shown in the figure:
1. Test the voltage, wavelength and brightness mainly. The wafer that meets the normal shipping standard parameters will continue to do the next step. If the nine-point test does not meet the relevant requirements, the wafer is placed on one side. deal with.
2. After the wafer is cut into chips, 100% of the visual inspection (VI/VC) is performed by the operator using a microscope magnified 30 times.
3. The chip is then fully automated, selected, tested, and classified using a fully automated sorter based on different voltage, wavelength, and brightness prediction parameters.
4. Finally, the LED chip is inspected (VC) and labeled. The chip area should be at the center of the blue film. There are up to 5,000 chips on the blue film, but the number of chips on each blue film must be no less than 1000. The chip type, batch number, quantity and photoelectric measurement statistics are recorded on the label. Attached to the back of the glossy paper. The chip on the blue film will be the same as the first visual inspection standard, ensuring that the chips are neatly arranged and of good quality. This makes LED chips (currently known as square chips on the market).
In the LED chip manufacturing process, some defective or electrode-worn chips are separated, these are the latter crystals. At this time, there are some wafers on the blue film that do not meet the normal shipping requirements. Become a side piece or a piece of hair.
Just mentioned that nine points are taken at different positions on the wafer for parameter testing. For wafers that do not meet the relevant requirements, these wafers cannot be directly used as LED chips, and therefore do not do anything. After the inspection, it was sold directly to the customer, which is the LED wafer on the market (but there are also good things in the big wafer, such as square chips).
5G Industrial Router features Application field
With the continuous progress and development of science and technology, a new generation of communication technology -5G is gradually entering our lives. In the industrial field, the application of 5G technology is also constantly advancing, bringing new opportunities and challenges to industrial production. Industrial routers, as one of the key devices for 5G applications, play a crucial role. This paper will introduce the definition, characteristics, application fields, development trends and other aspects of 5G industrial routers in detail.
What is 5G Industrial Router
Simply put, 5G industrial router is a special type of router equipment based on 5G technology, which is used to connect industrial equipment and systems to achieve high-speed transmission and exchange of data. Compared with traditional routers, 5G industrial routers have higher bandwidth and lower latency, which can better meet the requirements of real-time data transmission and high stability in industrial production environments.
Features of 5G industrial routers
First of all, high bandwidth is a significant feature of 5G industrial routers. The introduction of 5G technology enables industrial routers to support large-scale data transmission and processing, providing more powerful data communication capabilities for modern industrial production. Second, low latency is another important feature of 5G industrial routers. The advantage of low latency enables industrial routers to achieve real-time data transmission and processing, improving the efficiency and response speed of industrial production. In addition, 5G industrial routers also have the characteristics of high stability, high reliability and high security, and can cope with complex industrial environments and demanding data communication needs.
5G industrial router application field
First of all, the Internet of Things field is one of the important areas of 5G industrial router application. As the popularity and application range of Internet of Things devices continue to expand, the requirements for data communication are becoming higher and higher, and 5G industrial routers can provide reliable data connection and transmission services for Internet of Things devices. Secondly, the field of industrial automation is also one of the main application areas of 5G industrial routers. In industrial production, the transmission and processing of real-time data is crucial to improve production efficiency and quality, and 5G industrial routers can meet the needs of high-speed and low-latency data transmission to help achieve the goal of industrial automation. In addition, 5G industrial routers can also be widely used in intelligent transportation, smart cities, intelligent manufacturing and other fields.
With the continuous development of 5G technology, 5G industrial routers will also usher in a new development trend. First, with the popularity of iot devices, the demand for 5G industrial routers will further grow. Secondly, the introduction of virtualization and network slicing technology makes industrial routers have higher flexibility and scalability, in addition, the improvement of security will also become an important direction of the development of 5G industrial routers to cope with increasingly complex network threats and security challenges.
5G Industrial Router,Industrial Lte Router Poe,Industrial Security Router,Industrial 5G Cellular Router
Shenzhen MovingComm Technology Co., Ltd. , https://www.movingcommiot.com