Size-dependent carrier dynamics in self-assembled CdTe/ZnTe quantum dots

作者：Lee Hong Seok^*; Yim Sang Youp; Lee In Won; Kim Tae Whan

来源：Journal of Luminescence, 2012, 132(6): 1581-1583.

DOI：10.1016/j.jlumin.2012.01.054

• Quantum dots
• CdTe
• Carrier dynamics
• Strain
• Molecular beam epitaxy

We investigate size-dependent carrier dynamics in self-assembled CdTe/ZnTe quantum dots (QDs) grown using molecular beam epitaxy and atomic layer epitaxy. Photoluminescence (PL) spectra show that the excitonic peak corresponding to transitions from the ground electronic subband to ground heavy-hole band in CdTe/ZnTe QDs shifts to a lower energy with increasing ZnTe buffer thicknesses. This shift of the PL peak can be attributed to size variation of the CdTe QDs. In particular, carrier dynamics in CdTe QDs grown on various ZnTe buffer layer thicknesses is studied using time-resolved PL measurements. As a result, the decay time of CdTe QDs is shown to increase with increasing ZnTe buffer layer thicknesses due to the reduction of the exciton oscillator strength in the larger QDs.

• 出版日期2012-6