Molecular beam epitaxial growth of GaN on 3c-SiC/Si(111) substrates using a thick AIN buffer layer

Hexagonal GaN films (similar to 3 mu m) were grown on 3c-SiC/Si(111) and carbonized Si(111) substrates using a thick AlN buffer Cracks are observed on the surface of the GaN film grown on the carbonized Si(111), while no cracks are visible on the 3c-SiC/Si(111). XRD exhibits polycrystalline nature of the GaN film grown on the carbonized Si(111) due to poorer crystalline quality of this substrate. Raman spectra reveal that all GaN layers are under tensile stress, and the GaN layer grown on 3c-SiC/Si(111) shows a very low stress value of sigma(xx) = 0.65 Gpa. In low-temperature Photoluminescence spectra the remarkable donor-acceptor-pair recombination and yellow band can be attributed to the incorporation of Si impurities from the decomposition of SiC.

Hexagonal GaN films (similar to 3 mu m) were grown on 3c-SiC/Si(111) and carbonized Si(111) substrates using a thick AlN buffer Cracks are observed on the surface of the GaN film grown on the carbonized Si(111), while no cracks are visible on the 3c-SiC/Si(111). XRD exhibits polycrystalline nature of the GaN film grown on the carbonized Si(111) due to poorer crystalline quality of this substrate. Raman spectra reveal that all GaN layers are under tensile stress, and the GaN layer grown on 3c-SiC/Si(111) shows a very low stress value of sigma(xx) = 0.65 Gpa. In low-temperature Photoluminescence spectra the remarkable donor-acceptor-pair recombination and yellow band can be attributed to the incorporation of Si impurities from the decomposition of SiC.

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IEEE Electron Devices Soc.; Chinese Acad Sci.; Natl Nat Sci Fdn China.; Hakuto Co Ltd.; Shenzhen Oceans King Investment Imp & Exp Co.; Shenzhen Refond Opt ELE Co Ltd.; Jiangsu Nata Optoelect Mat Co Ltd.; Beijing Univ Technol.; Gen Res Inst Nnferrous Mat.; Nanjing Univ.; Shanghai Inst Microsyst & Informat Technol.; Sun Yat Univ.; Shanghai Inst Microsyst & Informat Technol.; Sun Yat Univ.; Zhejiang Univ.

Chinese Acad Sci, Inst Semicond, Novel Semicond Mat Lab, Beijing 100083, Peoples R China

IEEE Electron Devices Soc.; Chinese Acad Sci.; Natl Nat Sci Fdn China.; Hakuto Co Ltd.; Shenzhen Oceans King Investment Imp & Exp Co.; Shenzhen Refond Opt ELE Co Ltd.; Jiangsu Nata Optoelect Mat Co Ltd.; Beijing Univ Technol.; Gen Res Inst Nnferrous Mat.; Nanjing Univ.; Shanghai Inst Microsyst & Informat Technol.; Sun Yat Univ.; Shanghai Inst Microsyst & Informat Technol.; Sun Yat Univ.; Zhejiang Univ.