نيتريد الغاليوم

(تم التحويل من نيتريد الگاليوم)
هذا المقال هو عن نيتريد الغاليوم، المركب الكيميائي. إذا كنت تريد الاستخدامات الأخرى، انظر Gan.
Gallium nitride
GaNcrystal.jpg
GaN Wurtzite polyhedra.png
الأسماء
اسم أيوپاك
Gallium nitride
المُعرِّفات
رقم CAS
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.042.830 Edit this at Wikidata
UNII
الخصائص
الصيغة الجزيئية GaN
كتلة مولية 83.730 g/mol[1]
المظهر yellow powder
الكثافة 6.1 g/cm3[1]
نقطة الانصهار
قابلية الذوبان في الماء Insoluble[5]
الفجوة الحزمية 3.4 eV (300 K, direct)
حركية الإلكترون 1500 cm2/(V·s) (300 K)[2]
التوصيل الحراري 1.3 W/(cm·K) (300 K)[3]
معامل الانكسار (nD) 2.429
البنية
البنية البلورية Wurtzite
الزمرة الفراغية C6v4-P63mc
ثابت العقد a = 3.186 Å, c = 5.186 Å[6]
هندسة
إحداثية 		Tetrahedral
الكيمياء الحرارية
الإنتالپية المعيارية
للتشكل ΔfHo298 		−110.2 kJ/mol[7]
المخاطر
نقطة الوميض غير قابل للاشتعال
مركبات ذا علاقة
فوسفيد الگاليوم
زرنيخيد الگاليوم
أنتيمونيد الگاليوم
نيتريد البورون
نيتريد الألومنيوم
نيتريد الإنديوم
مركـّبات ذات علاقة
 زرنيخيد الألومنيوم گاليوم
زرنيخيد الإنديوم گاليوم
فوسفيد زرنيخيد الگاليوم
نيتريد الألومنيوم گاليوم
نيتريد الإنديوم گاليوم
ما لم يُذكر غير ذلك، البيانات المعطاة للمواد في حالاتهم العيارية (عند 25 °س [77 °ف]، 100 kPa).
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مراجع الجدول

نيتريد الگاليوم الثلاثي Gallium nitride is a binary III/V direct bandgap semiconductor commonly used in blue light-emitting diodes since the 1990s. The compound is a very hard material that has a Wurtzite crystal structure. Its wide band gap of 3.4 eV affords it special properties for applications in optoelectronic,[8][9] high-power and high-frequency devices. For example, GaN is the substrate which makes violet (405 nm) laser diodes possible, without requiring nonlinear optical frequency-doubling.

Its sensitivity to ionizing radiation is low (like other group III nitrides), making it a suitable material for solar cell arrays for satellites. Military and space applications could also benefit as devices have shown stability in radiation environments.[10]

Because GaN transistors can operate at much higher temperatures and work at much higher voltages than gallium arsenide (GaAs) transistors, they make ideal power amplifiers at microwave frequencies. In addition, GaN offers promising characteristics for THz devices.[11] Due to high power density and voltage breakdown limits GaN is also emerging as a promising candidate for 5G cellular base station applications.


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الخواص

GaN crystal

GaN is a very hard (Knoop hardness 14.21 GPa[12]:4), mechanically stable wide-bandgap semiconductor material with high heat capacity and thermal conductivity.[13] In its pure form it resists cracking and can be deposited in thin film on sapphire or silicon carbide, despite the mismatch in their lattice constants.[13] GaN can be doped with silicon (Si) or with oxygen[14] to n-type and with magnesium (Mg) to p-type.[15] However, the Si and Mg atoms change the way the GaN crystals grow, introducing tensile stresses and making them brittle.[16] Gallium nitride compounds also tend to have a high dislocation density, on the order of 108 to 1010 defects per square centimeter.[17] The wide band-gap behavior of GaN is connected to specific changes in the electronic band structure, charge occupation and chemical bond regions.[18]

The U.S. Army Research Laboratory (ARL) provided the first measurement of the high field electron velocity in GaN in 1999.[19] Scientists at ARL experimentally obtained a peak steady-state velocity of 1.9 x 107 cm/s, with a transit time of 2.5 picoseconds, attained at an electric field of 225 kV/cm. With this information, the electron mobility was calculated, thus providing data for the design of GaN devices.


التحضير

GaN with a high crystalline quality can be obtained by depositing a buffer layer at low temperatures.[20] Such high-quality GaN led to the discovery of p-type GaN,[15] p-n junction blue/UV-LEDs[15] and room-temperature stimulated emission[21] (essential for laser action).[22] This has led to the commercialization of high-performance blue LEDs and long-lifetime violet-laser diodes, and to the development of nitride-based devices such as UV detectors and high-speed field-effect transistors.

LEDs

High-brightness GaN light-emitting diodes (LEDs) completed the range of primary colors, and made applications such as daylight visible full-color LED displays, white LEDs and blue laser devices possible. The first GaN-based high-brightness LEDs used a thin film of GaN deposited via metalorganic vapour-phase epitaxy (MOVPE) on sapphire. Other substrates used are zinc oxide, with lattice constant mismatch of only 2% and silicon carbide (SiC).[23] Group III nitride semiconductors are, in general, recognized as one of the most promising semiconductor families for fabricating optical devices in the visible short-wavelength and UV region.

Transistors

The very high breakdown voltages,[24] high electron mobility and saturation velocity of GaN has also made it an ideal candidate for high-power and high-temperature microwave applications, as evidenced by its high Johnson's figure of merit. Potential markets for high-power/high-frequency devices based on GaN include microwave radio-frequency power amplifiers (such as those used in high-speed wireless data transmission) and high-voltage switching devices for power grids. A potential mass-market application for GaN-based RF transistors is as the microwave source for microwave ovens, replacing the magnetrons currently used. The large band gap means that the performance of GaN transistors is maintained up to higher temperatures (~400 °C[25]) than silicon transistors (~150 °C[25]) because it lessens the effects of thermal generation of charge carriers that are inherent to any semiconductor. The first gallium nitride metal semiconductor field-effect transistors (GaN MESFET) were experimentally demonstrated in 1993[26] and they are being actively developed.

In 2010, the first enhancement-mode GaN transistors became generally available.[27] Only n-channel transistors were available.[27] These devices were designed to replace power MOSFETs in applications where switching speed or power conversion efficiency is critical. These transistors are built by growing a thin layer of GaN on top of a standard silicon wafer, often referred to as GaN-on-Si by manufacturers.[28] This allows the FETs to maintain costs similar to silicon power MOSFETs but with the superior electrical performance of GaN. Another seemingly viable solution for realizing enhancement-mode GaN-channel HFETs is to employ a lattice-matched quaternary AlInGaN layer of acceptably low spontaneous polarization mismatch to GaN.[29]

GaN power ICs monolithically integrate a GaN FET, GaN-based drive circuitry and circuit protection into a single surface-mount device. Integration means that the gate-drive loop has essentially zero impedance, which further improves efficiency by virtually eliminating FET turn-off losses. Academic studies into creating low-voltage GaN power ICs began at the Hong Kong University of Science and Technology (HKUST) and the first devices were demonstrated in 2015. Commercial GaN power IC production began in 2018.

CMOS logic

In 2016 the first GaN CMOS logic using PMOS and NMOS transistors was reported (with gate widths of the PMOS and NMOS transistors of 500μm and 50μm, respectively).[30]

التطبيقات

LEDs and lasers

GaN-based violet laser diodes are used to read Blu-ray Discs. The mixture of GaN with In (InGaN) or Al (AlGaN) with a band gap dependent on the ratio of In or Al to GaN allows the manufacture of light-emitting diodes (LEDs) with colors that can go from red to ultra-violet.[23]

الترانزستورات

GaN transistors are suitable for high frequency, high voltage, high temperature and high efficiency applications.[بحاجة لمصدر]

GaN HEMTs have been offered commercially since 2006, and have found immediate use in various wireless infrastructure applications due to their high efficiency and high voltage operation. A second generation of devices with shorter gate lengths will address higher frequency telecom and aerospace applications.[31]

GaN based MOSFET and MESFET transistors also offer advantages including lower loss in high power electronics, especially in automotive and electric car applications.[32] Since 2008 these can be formed on a silicon substrate.[32] High-voltage (800 V) Schottky barrier diodes (SBDs) have also been made.[32]

GaN-based electronics (not pure GaN) has the potential to drastically cut energy consumption, not only in consumer applications but even for power transmission utilities.

Unlike silicon transistors which switch off due to power surges, GaN transistors are typically depletion mode devices (i.e. on / resistive when the gate-source voltage is zero). Several methods have been proposed to reach normally-off (or E-mode) operation, which is necessary for use in power electronics:[33][34]

  • the implantation of fluorine ions under the gate (the negative charge of the F-ions favors the depletion of the channel)
  • the use of a MIS-type gate stack, with recess of the AlGaN
  • the integration of a cascaded pair constituted by a normally-on GaN transistor and a low voltage silicon MOSFET
  • the use of a p-type layer on top of the AlGaN/GaN heterojunction

الرادارات

They are also utilized in military electronics such as active electronically scanned array radars.[35]

It was introduced by Thales in 2010 with the Ground Master 400 radar.[36]

The U.S. Army funded Lockheed Martin to incorporate GaN active-device technology into the AN/TPQ-53 radar system to replace two medium-range radar systems, the AN/TPQ-36 and the AN/TPQ-37.[37][38] The AN/TPQ-53 radar system was designed to detect, classify, track, and locate enemy indirect fire systems, as well as unmanned aerial systems.[39] The AN/TPQ-53 radar system provided enhanced performance, greater mobility, increased reliability and supportability, lower life-cycle cost, and reduced crew size compared to the AN/TPQ-36 and the AN/TPQ-37 systems.[37]

Lockheed Martin fielded other tactical operational radars with GaN technology in 2018, including TPS-77 Multi Role Radar System deployed to Latvia and Romania.[40] In 2019, Lockheed Martin's partner ELTA Systems Limited, developed a GaN-based ELM-2084 Multi Mission Radar that was able to detect and track air craft and ballistic targets, while providing fire control guidance for missile interception or air defense artillery.

On April 8 2020, Saab flight tested its new GaN designed AESA X-band radar in a JAS-39 Gripen fighter.[41] Saab already offers products with GaN based radars, like the Giraffe radar, Erieye, GlobalEye, and Arexis EW.[42][43][44][45] Saab also delivers major subsystems, assemblies and software for the AN/TPS-80 (G/ATOR)[46]

مقياس النانو

GaN nanotubes and nanowires are proposed for applications in nanoscale electronics, optoelectronics and biochemical-sensing applications.[47][48]

Spintronics potential

When doped with a suitable transition metal such as manganese, GaN is a promising spintronics material (magnetic semiconductors).[23]


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التخليق

Bulk substrates

GaN crystals can be grown from a molten Na/Ga melt held under 100 atmospheres of pressure of N2 at 750 °C. As Ga will not react with N2 below 1000 °C, the powder must be made from something more reactive, usually in one of the following ways:

2 Ga + 2 NH3 → 2 GaN + 3 H2[49]
Ga2O3 + 2 NH3 → 2 GaN + 3 H2O[50]

Gallium nitride can also be synthesized by injecting ammonia gas into molten gallium at 900-980 °C at normal atmospheric pressure.[51]

Molecular beam epitaxy

Commercially, GaN crystals can be grown using molecular beam epitaxy or metalorganic vapour phase epitaxy. This process can be further modified to reduce dislocation densities. First, an ion beam is applied to the growth surface in order to create nanoscale roughness. Then, the surface is polished. This process takes place in a vacuum. Polishing methods typically employ a liquid electrolyte and UV irradiation to enable mechanical removal of a thin oxide layer from the wafer. More recent methods have been developed which utilize solid-state polymer electrolytes which are solvent-free and require no radiation before polishing.[52]

السلامة

GaN dust is an irritant to skin, eyes and lungs. The environment, health and safety aspects of gallium nitride sources (such as trimethylgallium and ammonia) and industrial hygiene monitoring studies of MOVPE sources have been reported in a 2004 review.[53]

Bulk GaN is non-toxic and biocompatible.[54] Therefore, it may be used in the electrodes and electronics of implants in living organisms.

انظر أيضاً

الهامش

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