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Patterning via Optical Saturable Transitions - Fabrication and Characterization

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Phase transformation in SiOx/SiO₂ multilayers for optoelectronics and microelectronics applications.

M Roussel¹, E Talbot, R Pratibha Nalini

¹Groupe de Physique des Matériaux, Université et INSA de Rouen, UMR CNRS 6634, Avenue de l'Université, BP 12, 76801 Saint Etienne du Rouvray, France, Europe.

Ultramicroscopy

|January 5, 2013

Summary

Silicon nanoclusters (Si-ncs) in SiO(x)/SiO₂ multilayers are crucial for optoelectronics. Atom probe tomography reveals how silicon supersaturation, annealing, and layer thickness control Si-nc formation and microstructure.

Keywords:

Atom probe Tomography Multilayers Optoelectronics Phase transformation Silicon nanocluster

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Area of Science:

Materials Science
Nanotechnology
Solid State Physics

Background:

Silicon nanoclusters (Si-ncs) are vital for advanced optoelectronics and microelectronics due to quantum confinement effects.
SiO(x)/SiO₂ multilayers offer a promising platform for embedding Si-ncs, requiring controlled fabrication and annealing processes.

Purpose of the Study:

To investigate the phase separation and nanocluster formation in SiO(x)/SiO₂ multilayers.
To elucidate the influence of key parameters on the resulting microstructure of Si-ncs.

Main Methods:

Fabrication of SiO(x)/SiO₂ multilayers using magnetron sputtering.
Annealing treatments to induce phase separation and Si-nc growth.
Atom probe tomography (APT) for high-resolution microstructural analysis.

Main Results:

Silicon supersaturation dictates the phase separation mechanism (nucleation/growth vs. spinodal decomposition).
Annealing temperature governs Si-nc size and their interfacial properties with the matrix.
Layer thicknesses influence Si-nc morphology, ranging from spherical to spinodal-like structures.

Conclusions:

Precise control over fabrication and annealing parameters is essential for tailoring Si-nc properties in SiO(x)/SiO₂ multilayers.
Atom probe tomography provides critical insights into the complex nanoscale phenomena governing Si-nc formation.
This study offers a pathway for optimizing Si-nc embedded dielectric materials for future electronic and photonic devices.