sapphire substrates
Nanoscratch Characterization of GaN Epilayers on c and a Axis Sapphire Substrates
... The GaN epilayers used in this study were grown using metal-organic chemical vapor deposition (MOCVD) onto both c-plane (0001) and a-plane (1120) sapphire substrates. To fabricate the GaN epilayers, a ...
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Effect of Annealing Temperature and Atmosphere to Surface Solid Phase Reaction of Sapphire Substrates and Spin Coated Copper Nitrate Gel Films
... A copper source solution was prepared by dissolving 2.42 g of copper(II) nitrate trihydrate in 25 mL of 2-methoxyethanol. The solution was stirred for 24 h to produce a light blue and homogenous solution. The solution ...
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Influence of patterned sapphire substrates with different symmetry on the light output power of InGaN based LEDs
... This paper aims to investigate the light output power (LOP) of InGaN-based light-emitting diodes (LEDs) grown on patterned sapphire substrates (PSSs) with different symmetry. The GaN epitaxial layers grown ...
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Enhancement of InGaN Based Light Emitting Diodes Performance Grown on Cone Shaped Pattern Sapphire Substrates
... patterned sapphire (CPSS) by using metal organic chemical vapor deposi- tion ...planar sapphire substrates (USS) indicates that the crystalline quality was improved significantly and the internal ...
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Micromorphology of AlN Epilayers on Sapphire Substrates
... Magnetron sputtering was used for preparation of the AlN films. For the target material aluminum target was used. Nitrogen component was compensated from HF-activated plasma. The sapphire substrates were ...
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Large scale fabrication of nanopatterned sapphire substrates by annealing of patterned Al thin films by soft UV nanoimprint lithography
... was no longer discernible. The phenomenon of surface diffusion-driven smoothing of surface features is well established in the literature [19-22] and occurs due to surface energy considerations [23,24]. The kinetics of ...
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Interfactant action of an amphiphilic polymer upon directing graphene oxide layer formation on sapphire substrates
... Quality assured surface pre‑treatment may greatly enhance adhesive interactions and, thus, the performance and durability of material joints. This holds true as well for substrates used in coating processes as for ...
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Structure and Properties of VO2 and TiO2 Based Epitaxial Heterostructures Integrated with Silicon and Sapphire Substrates.
... large categories for epitaxy, namely homoepitaxy and heteroepitaxy. In the former, the film and the substrate are the same material. Epitaxial silicon films deposited on silicon wafers using vapor-phase epitaxy (VPE) is ...
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Modulus and Hardness Change of Silicon and Sapphire Substrates by TiC/VC Multilayer Coatings
... So far, a wide variety of MuL coatings have been studied to improve the resistance of various metallic or nonmetallic bulk material (cf., e.g., Abadias et al. [9]). The aim of the present work was to study the nanohard- ...
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Annealing of an AlN buffer layer in N2-CO for growth of a high-quality AlN film on sapphire
... 1650 °C was 0.49 nm. Figure 4 shows the FWHMs of the (a) (0002)- and (b) ( 1012 )-plane XRCs for the AlN bu ff er layers after annealing at various temperatures. The dotted line shows the FWHM of the XRC for the AlN bu ff ...
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Effects of substrate annealing on the gold catalyzed growth of ZnO nanostructures
... on sapphire substrates annealed at these different ...as-received sapphire substrates (Figure 2a) and on those annealed at 1,000°C (Figure 2b) were noticeably inferior to those grown on ...
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Characterization of the Nucleation Layer in GaN/Sapphire Heterostructures
... as substrates for homoepitaxial ...of substrates as listed in Table1.2. Sapphire remains the most common choice for GaN heteroepitaxy despite its poor structural and thermal mismatch with GaN ...
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High temperature MBE of graphene on sapphire and hexagonal boron nitride flakes on sapphire
... on sapphire are conducting with a resistance per square between 10 and 200 kX depending on the layer thicknesses and growth ...on sapphire substrates at lower MBE growth ...
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Measurement of Impact Ionization Coefficients in GaN.
... Electron and hole impact ionization coefficients in GaN as a function of electric field were first modeled based upon Monte Carlo simulations [11] [12]. Cao et. al. [13] have calculated the impact ionization effect in ...
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Growth and Characterization of ZnO and ZnO-Based Alloys MgxZn1-xO and MnxZn1-xO
... In this work, high quality single-crystalline MgZnO films had been grown epitaxially on sapphire substrates by using pulsed laser deposition. Mg content achieved by our nonequilibrium growth method is ...
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Enhanced Light Emission due to Formation of Semi polar InGaN/GaN Multi quantum Wells
... InGaN/GaN multi-quantum wells (MQWs) are grown on (0001) sapphire substrates by metal organic chemical vapor deposition (MOCVD) with special growth parameters to form V-shaped pits simultaneously. ...
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Thin Film Epitaxy, Defects and Interfaces in GaN/Sapphire and ZnO/Sapphire Heterostructures (Polar and Non-polar) for Light Emitting Diodes
... Raman spectroscopy in conjunction with high-resolution transmission electron microscopy (HRTEM) has been used to study structural characteristics and strain distribution of the nanostructured GaN nucleation layer (NL) ...
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Investigation of Europium Doped Wide Band Gap Oxides and an Annealing Study of the Amorphous Oxide Semiconductor - Indium Gallium Zinc Oxide
... The electronic, optical and luminescent properties of europium doped wide band gap oxide thin films and the electronic properties of indium gallium zinc oxide (IGZO), a novel amorphous oxide semiconductor were ...
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Fluorescence of Ti3+ ions thermally diffused into sapphire
... the sapphire lattice promotes the formation of local defect structures, and is also known to interact with nearby Ti ions, forming an additional optical absorption ...undoped sapphire substrates were ...
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Growth and Fabrication of GaN/InGaN Violet Light Emitting Diode on Patterned Sapphire Substrate
... GaN/InGaN based violet light emitting diodes (LEDs), emitting at 430 nm, have been grown on conventional single side polished (SSP) and patterned sapphire substrates (PSS). Characteristics of the epitaxial ...
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