..................................................................................................................... x CHAPTER 1 : INTRODUCTION .................................................................................... 1 ................................................................................................ 1.1 Purpose of Work 1 .................................................

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Thick GaN layers have been grown by hydride vapor phase epitaxy (HVPE) on different GaN templates grown by metalorganic vapor phase epitaxy. Crack formation could be reduced by using a hydrogen/nitrogen carrier gas mixture. By carefully optimizing the growth conditions in the final stage of the process, excellent surface morphologies could be obtained at still acceptably high growth rates. Up t...

Surface chemistry involved in the epitaxy of graphene by sublimating Si atoms from the surface of epitaxial 3C-SiC(111) thin films on Si(111) has been studied. The change in the surface composition during graphene epitaxy is monitored by in situ temperature-programmed desorption spectroscopy using deuterium as a probe (D(2)-TPD) and complementarily by ex situ Raman and C1s core-level spectrosco...

Here we review the characteristics of "van der Waals epitaxy" (vdWE) as an alternative epitaxy mechanism that has been demonstrated as a viable method for circumventing the lattice matching requirements for epitaxial growth. Particular focus is given on the application of vdWE for nonplanar nanostructures. We highlight our works on the vdWE growth of nanowire arrays, tripods, and tetrapods from...

A review of surface structures of bare and adsorbate-covered GaN (0001) and (0001) surfaces is presented, including results for In, Mg, Si, and H adsorbates. Emphasis is given to direct determination of surface structure employing experimental techniques such as scanning tunneling microscopy, electron diffraction, and Auger spectroscopy, and utilizing first principles computations of the total ...

Using a previously shown method, we prepared 2”-GaN wafers as templates for a self separation process. Self separation is happening during cooldown after growing thick layers of GaN in our hydride vapor phase epitaxy (HVPE) reactor. Our templates consist of GaN grown by metalorganic vapor phase epitaxy (MOVPE) directly on sapphire. These GaN layers are masked with 200nm of SiN that are structur...

Photoluminescence is used to optically characterize epitaxially-grown ZnSe. The ZnSe has been grown by three different growth techniques; molecular beam epitaxy, metalorganic molecular beam epitaxy and gas source molecular beam epitaxy. Photoluminescence measurements have been made for each growth method for a wide range of growth parameters. The effects of the growth parameters, as well as the...

Van der Waals (vdW) epitaxy is an attractive method for the fabrication of vdW heterostructures. Here Sb2Te3 films grown on three different kind of graphene substrates (monolayer epitaxial graphene, quasi freestanding bilayer graphene and the SiC (6√3 × 6√3)R30° buffer layer) are used to study the vdW epitaxy between two 2-dimensionally (2D) bonded materials. It is shown that the Sb2Te3 /graphe...