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Growth temperature induced effects in non-polar a-plane GaN on r-plane sapphire substrate by RF-MBE
M.K. Rajpalke, T.N. Bhat, B. Roul, , P. Misra, L.M. Kukreja, N. Sinha, S.B. Krupanidhi
Published in
Volume: 314
Issue: 1
Pages: 5 - 8
Non-polar a-plane GaN films were grown on an r-plane sapphire substrate by plasma assisted molecular beam epitaxy (PAMBE). The effect of growth temperature on structural, morphological and optical properties has been studied. The growth of non-polar a-plane (1 1 -2 0) orientation of the GaN epilayers were confirmed by high resolution X-ray diffraction (HRXRD) study. The X-ray rocking curve (XRC) full width at half maximum of the (1 1 -2 0) reflection shows in-plane anisotropic behavior and found to decrease with increase in growth temperature. The atomic force micrograph (AFM) shows island-like growth for the film grown at a lower temperature. Surface roughness has been decreased with increase in growth temperature. Room temperature photoluminescence shows near band edge emission at 3.4343.442 eV. The film grown at 800 °C shows emission at 2.2 eV, which is attributed to yellow luminescence along with near band edge emission. © 2010 Elsevier B.V. All rights reserved.
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JournalJournal of Crystal Growth