Growth and Characterization of ZnSe/CdSe Multiquantum Disks

The authors report the growth of high-density ZnSe/CdSe multiquantum disks on oxidized Si substrate. It was found the as-grown nanotips were tapered with the mixture of cubic zinc blende and hexagonal wurtzite structures. Also, photoluminescence intensities observed from these ZnSe/CdSe multiquantum disks were much larger than that observed from the homogeneous ZnSe. Activation energies for the ZnSe/CdSe multiquantum disks with well widths L
_w
of 8, 12, and 16 nm were 22, 62, and 56 meV, respectively.