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Gallium nitride


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GaN for semiconductor..

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Gallium nitride

  1. 1. COMPOUND:Gallium Nitride (GaN)
  2. 2. AbstractScopeGeneral properties of gallium nitride(GaN)Characterization toolsScreen printing process of galliumnitride (GaN)IV and CV characteristics of gallium nitride (GaN)
  3. 3. To study the relationship between DC currentthrough an electronic device and the DC voltageacross its terminal using Gallium Nitride in I-VTest. To study the characterization semiconductormaterial and structure parameters using GalliumNitride in C-V Test.
  4. 4. Broadband Performance of GaNMonolithic Switchmode Power HEMTsConversion
  5. 5. Fig. 1. XRD pattern of synthesised GaN powder.
  6. 6. Fig. 2. SEM photographs of synthesised GaN material which consists of:(a) hexagonal; (b) needle shaped crystals.
  7. 7. Fig. 3. Room temperature PL spectrum of synthesised GaN powder.
  8. 8. Fig. 4. Room temperature Raman spectrum of synthesised GaN powder
  9. 9. XRD and Raman spectroscopy were investigated toprovide a better understanding of the crystal structureof gallium oxynitrides prepared by ammonolysis ofoxide precursors.
  10. 10. The comparison of gallium oxynitrideXRD patternRaman spectroscopy
  11. 11. The sensitive materials from gallium oxynitride(GaON) were deposited by screen-printing technologyon alumina and sapphire substrates, resulting in layerthicknesses of 10-20 mm. As shown in Fig. 5 for gallium oxynitride (GaON) thethick layers exhibit macroporosity allowing a gooddiffusion of the gas into the sensitive layers.
  12. 12. Expected Device: Gas sensor The result for gas sensing measurement of galliumoxynitride is shown in Figure 6: Electrical responsesof a “GaON” sensor (25 m thick) to 250 ppm ethanolat 220, 260, 320 and 380 ◦C in: (a) humid (50% RH)and (b) dry (0% RH) synthetic air.
  13. 13. The sensor exhibits a strong signal towards ethanolwith a resistance decrease of approximately amagnitude. Additionaly to a short response time (t90<1min) thesignal recovery is complete after exposition to ethanol. The sensor signal to CO is less strong. Still, the cleanslope, short response time (t90<2min) and completesignal recovery encourages further studies.
  14. 14.  IV characteristics CV characteristics
  15. 15. Figure 1: XRD pattern of GaN powder prepared byammonolysis (900 ◦C, 16 h) of β-Ga2O3. Figure 2: XRD pattern of GaON(a) powder preparedby ammonolysis (600 ◦C, 72 h) of NiGa2O4. Figure 3: XRD pattern of GaON(b) powder preparedby ammonolysis (800 ◦C, 10 h) of a citrate method-derived precursor. GaN XRD pattern
  16. 16. Figure 4(a): Raman spectra obtained at roomtemperature under excitation at 488 nm. Spectra werevertically shifted for clarity. Figure4 (b): Same as figure 4(a), expanded in theregion of GaN first-order Raman modes. Vertical linesindicate the first-order Raman modes of hexagonal (h-GaN) and cubic (c-GaN) phases of GaN. Raman scattering for GaN
  17. 17. Figure 1: Home
  18. 18. Figure 3: Home
  19. 19. Figure 4: Home
  20. 20. Figure 5: Optical microscope photography of thesurface of a gallium oxynitride thick layer deposited byscreen-printing on sapphire substrate. Home
  21. 21. Figure 6: Home
  22. 22. Figure 7: Home
  23. 23. Figure 7: Home
  24. 24.  Homoepitaxy:Is a kind of epitaxy (the deposition of a crystalline overlayer on a crystalline substrate, where the overlayer is in registry with the substrate) performed with only one material.
  25. 25.  Morphology:The shape and size of particles making up the object; direct relation between these structures and material properties (ductility, strength, reactivity, etc)
  26. 26.  Woven:Is a cloth formed by weaving (is a method of fabric production in which two distinct sets of yarns or threads are interlaced at right angles to form a fabric or cloth).
  27. 27.  mesh:Mesh consists of semi-permeable barrier made of connected strands of metal, fiber, or other flexible/ductile material.
  28. 28.  stencil:is a thin sheet of material, such as paper, plastic, or metal, with letters or a design cut from it, used to produce the letters or design on an underlying surface by applying pigment through the cut-out holes in the material.
  29. 29. :Crystallizing with high degree of stoichiometry, most can be obtained as both n-type and p-type. Many have high carrier mobilities and direct energy gaps, making them useful for optoelectronics.
  30. 30. :Relative humidity is a term used to describe the amount of water vapor in a mixture of air and water vapor.