SiO2/PbTe quantum-dot multilayer production and characterization

Rodríguez, E.; Jimenez, E.; Padilha, L. A.; Neves, A. A. R.; Jacob, G. J.; César, C. L.; Barbosa, L. C.
March 2005
Applied Physics Letters;3/14/2005, Vol. 86 Issue 11, p113117
Academic Journal
We report the fabrication of multilayer structures containing layers of PbTe quantum dots (QDs) spaced by 15–20 nm thick SiO2 layers. The QDs were grown by the laser ablation of a PbTe target using the second harmonic of Nd:YAG laser in an argon atmosphere. The SiO2 layers were fabricated by plasma chemical vapor deposition using tetramethoxysilane as a precursor. The influence of the ablation time on the size and size distribution of the QDs is studied by high-resolution transmission electron microscopy. Optical absorption measurements show clearly the QDs confinement effects.


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