We fabricated the homoepitaxial AlN layers and AlGaN/AlN multi-quantum wells (MQWs) grown on freestanding
AlN (0001) substrates by metalorganic vapor phase epitaxy. Crystallographic and optical characteristics of these AlN
layers and AlGaN/AlN MQWs were investigated by X-ray diffraction (XRD), SEM, AFM, PL, and so on. These
characteristics of MQWs are strongly dependent on growth condition of homoepitaxial AlN layer. In case that AlN
layers are grown with high temperature and low V/III ratio, there are many hillocks on the surface and no PL signal from
MQW. In contrast, strong PL emission cannot be obtained from AlGaN/AlN MQW on AlN layer grown with lower
temperature and higher V/III ratio, because this MQW has large surface roughness from results of XRD and AFM
measurement. We optimized the growth condition of AlN layers and obtained the high quality AlGaN/AlN MQW with
smooth surface, strong PL emission.
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