Photoluminescence Spectroscopy of CdTe/ZnTe Self-Assembled Quantum Dots

摘要

We present photoluminescence (PL) measurements of two different, 3 monolayers and 12 monolayers (ml), CdTe self-assembled quantum dot (SAQD) samples. The spectra were recorded in the temperature range 20 K-300 K, with photoexcitation over the ZnTe barrier layer. PL spectra displayed two main emission bands. High-energy PL emission (E_(1)) is ZnTe LO like phonon-((omega)_(LO) velence 204.2 cm~(-1) (3 ml), (omega)_(LO) velence 207.3 cm~(-1) (12 ml)) assisted deexcitation. Dominant low-energy band (E_(2)) presents the direct deexcitation to ground state of the CdTe quantum dots.