Application prospect of gallium nitride

What is gallium nitride?
Gallium nitride is a wide-bandgap composite semiconductor material. According to the 3rd party'' s computation, after utilizing GaN tools, the common smart phone battery charger can decrease weight by as much as 40% or outcome more power under the very same size problems. It puts on customer, commercial, automobile, as well as other electronic items. The target applications of this collection include the integrated power supply of consumer digital products, such as battery chargers, computer exterior power adapters, LED lighting drivers, televisions, and other house appliances.

Application possibility of gallium nitride
For GaN materials, the thickness of heteroepitaxial problems is rather high due to the fact that the single substrate crystal has actually not been solved for a lengthy time, yet the device degree has actually been useful. In 1994, Niya Chemical made 1200mcd LED; in 1995, it made Zcd blue light (450nmLED) and also thumbs-up 12cd (520nmLED); In 1998, Japan created a seven-year strategy to establish LEDs utilizing vast band gap nitride products. The objective is to develop high-energy ultraviolet LEDs sealed in fluorescent tubes and also emitting white light by 2005. The power consumption of this white LED is only 1/8 of that of incandescent lamps and 1/2 of that of fluorescent lamps, as well as its life is 50-100 times that of typical fluorescent lights. This proves that the advancement of GaN products has been rather successful as well as has gone into the functional phase. The generation of InGaN system alloys, InGaN/AlGaN double junction LED, InGaN solitary quantum well LED, InGaN several quantum well LED, and so on have actually been established effectively. InGaNSQWLED6cd high-brightness pure environment-friendly tea and 2cd high-brightness blue LEDs have been produced. In the future, it can be accomplished by integrating with AlGaP and AlGaAs collection red LEDs to form a bright full-color display screen. This way, the white light combined with 3 key colors likewise opens up brand-new application areas, and the period defined by high reliability and long-life LED will certainly come. LEDs will certainly change fluorescent lights as well as light bulbs. LED will become the leading item. GaN transistors will certainly establish quickly with material development and tool modern technology and become a brand-new generation of high-temperature regularity and high-power tools.

Disadvantages and issues of gallium nitride
On the one hand, in theory, due to its energy band structure, the efficient mass of the service provider is big, as well as the transportation home is poor, so the reduced electrical field flexibility is low, and also the high-frequency performance is bad. On the other hand, GaN solitary crystals expanded by heteroepitaxy (utilizing sapphire and also SiC as substratums) are not really satisfactory (which hinders the advancement of GaN devices). As an example, the misplacement thickness gets to 108 ~ 1010/cm2 (although the crystal structure of sapphire and also SiC resembles GaN, there are still relatively big latticework inequality and also thermal mismatch); The background carrier (electron) focus of undoped GaN at room temperature level is as high as 1017cm-3 (perhaps related to N job, substitutional Si, substitutional O, and so on), as well as reveals n-type conductivity; Although it is easy to attain n-type doping (doping Si can acquire n-type GaN with electron focus of 1015 ~ 1020/cm3 as well as room temperature level wheelchair > 300 cm2/V. s), the p-type doping level is too reduced (primarily doped with Mg), the resulting hole concentration is only 1017 ~ 1018/cm3, flexibility

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