摘要Mn-doped GaN epitaxial films were grown by metal organic chemical vapour deposition (MOCVD). Micro-structural properties of films are investigated using Raman scattering. It is found that with increasing Mn-dopants levels, longitudinal optical phonon mode A1(LO) of films is broadened and shifted towards lower frequency. This phenomenon possibly derives from the difference in bonding strength between Ga-N pairs and Mn-N pairs in host lattice. In addition, optical properties of films are investigated using cathodoluminescence and absorption spectroscopy. Mn-related both emission band around 3.0eV and absorption bands around 1.5 and 2.95eV are observed. By studies on structural and optical properties of Mn-doped GaN, we find that Mn ions substitute for Ga sites in host lattice. However, carrier-mediated ferromagnetic exchange seems unlikely due to deep levels of Mn acceptors.
Abstract：Mn-doped GaN epitaxial films were grown by metal organic chemical vapour deposition (MOCVD). Micro-structural properties of films are investigated using Raman scattering. It is found that with increasing Mn-dopants levels, longitudinal optical phonon mode A1(LO) of films is broadened and shifted towards lower frequency. This phenomenon possibly derives from the difference in bonding strength between Ga-N pairs and Mn-N pairs in host lattice. In addition, optical properties of films are investigated using cathodoluminescence and absorption spectroscopy. Mn-related both emission band around 3.0eV and absorption bands around 1.5 and 2.95eV are observed. By studies on structural and optical properties of Mn-doped GaN, we find that Mn ions substitute for Ga sites in host lattice. However, carrier-mediated ferromagnetic exchange seems unlikely due to deep levels of Mn acceptors.
CUI Xu-Gao;ZHANG Rong;TAO Zhi-Kuo;LI Xin;XIU Xiang-Qian;XIE Zi-Li;ZHENG You-Dou. Optical and Structural Properties of Mn-Doped GaN Grown by Metal Organic Chemical Vapour Deposition[J]. 中国物理快报, 2009, 26(3): 38103-038103.
CUI Xu-Gao, ZHANG Rong, TAO Zhi-Kuo, LI Xin, XIU Xiang-Qian, XIE Zi-Li, ZHENG You-Dou. Optical and Structural Properties of Mn-Doped GaN Grown by Metal Organic Chemical Vapour Deposition. Chin. Phys. Lett., 2009, 26(3): 38103-038103.
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