Application prospect of gallium nitride

What is gallium nitride?
Gallium nitride is a wide-bandgap composite semiconductor product. According to the 3rd party'' s estimation, after using GaN tools, the standard mobile phone battery charger can reduce weight by as much as 40% or outcome even more power under the same dimension conditions. It applies to consumer, industrial, automobile, and also various other electronic items. The target applications of this collection include the built-in power supply of customer electronic products, such as battery chargers, computer outside power adapters, LED lights vehicle drivers, tvs, and other family home appliances.

Application possibility of gallium nitride
For GaN materials, the density of heteroepitaxial flaws is fairly high due to the fact that the solitary substratum crystal has actually not been fixed for a lengthy time, however the device level has been functional. In 1994, Niya Chemical made 1200mcd LED; in 1995, it made Zcd blue light (450nmLED) as well as green light 12cd (520nmLED); In 1998, Japan formulated a seven-year strategy to develop LEDs utilizing wide band gap nitride products. The goal is to develop high-energy ultraviolet LEDs sealed in fluorescent tubes and sending out white light by 2005. The power intake of this white LED is just 1/8 of that of incandescent lights as well as 1/2 of that of fluorescent lamps, and its life is 50-100 times that of standard fluorescent lights. This confirms that the development of GaN products has been rather successful as well as has actually gone into the functional stage. The generation of InGaN system alloys, InGaN/AlGaN double joint LED, InGaN single quantum well LED, InGaN numerous quantum well LED, etc have actually been created efficiently. InGaNSQWLED6cd high-brightness pure environment-friendly tea and also 2cd high-brightness blue LEDs have actually been produced. In the future, it can be achieved by incorporating with AlGaP and AlGaAs collection red LEDs to create a bright full-color display screen. In this method, the white light source combined with 3 primary shades also opens up brand-new application areas, as well as the age identified by high reliability and long-life LED will come. LEDs will certainly change fluorescent lights and also light bulbs. LED will certainly end up being the leading product. GaN transistors will certainly develop swiftly with material growth and tool modern technology and also come to be a brand-new generation of high-temperature regularity as well as high-power gadgets.

Negative aspects and troubles of gallium nitride
On the one hand, theoretically, because of its power band structure, the reliable mass of the provider is large, as well as the transportation residential or commercial property is poor, so the low electric field mobility is low, as well as the high-frequency performance is bad. On the various other hand, GaN solitary crystals grown by heteroepitaxy (using sapphire and also SiC as substrates) are not really satisfying (which impedes the development of GaN gadgets). For instance, the misplacement thickness reaches 108 ~ 1010/cm2 (although the crystal framework of sapphire and also SiC is similar to GaN, there are still reasonably large latticework mismatch and thermal mismatch); The background carrier (electron) focus of undoped GaN at area temperature is as high as 1017cm-3 (perhaps pertaining to N job, substitutional Si, substitutional O, etc), as well as reveals n-type conductivity; Although it is very easy to attain n-type doping (doping Si can obtain n-type GaN with electron focus of 1015 ~ 1020/cm3 as well as area temperature wheelchair > 300 cm2/V. s), the p-type doping degree is too reduced (primarily doped with Mg), the resulting hole concentration is just 1017 ~ 1018/cm3, flexibility

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