Formation and optical properties of CdTe self-assembled pyramids with quantum states grown on ZnTe buffer layers

Lee, E.H.; Lee, K.H.; Kim, J.S.; Park, H.L.; Kim, T.W.
December 2003
Applied Physics Letters;12/29/2003, Vol. 83 Issue 26, p5536
Academic Journal
Atomic force microscopy (AFM) and photoluminescence (PL) measurements were carried out to investigate the structure and to determine the electron activation energy in CdTe/ZnTe pyramids grown by using molecular beam epitaxy and atomic layer epitaxy methods. The AFM images showed that self-assembled CdTe pyramids were formed on ZnTe buffer layers. The PL spectra showed that the formed CdTe pyramids had quantum states and that the excitonic peak corresponding to the transition from the ground electronic subband to the ground heavy-hole band (E[sub 1]–HH[sub 1]) in the CdTe/ZnTe pyramids was shifted to higher energy in comparison with that in CdTe/ZnTe quantum dots (QDs). The activation energy of the electrons confined in the CdTe pyramids, as obtained from the temperature-dependent PL spectra, was higher than that in CdTe QDs. These results can help improve an understanding of the formation and optical properties in self-assembled CdTe pyramids with quantum states. © 2003 American Institute of Physics.


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