SiO2/PbTe quantum-dot multilayer production and characterization

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APPLIED PHYSICS LETTERS, 86(11). CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA: AMER INST PHYSICS (2005) .

AMER INST PHYSICS

Abstract

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. (C) 2005 American Institute of Physics.



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