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Mechanical Properties of Porous MSQ Films: Impact of the Porogen Loading and Matrix Crosslinking.

Published online by Cambridge University Press:  01 February 2011

F. Ciaramella ,
V. Jousseaume ,
S. Maitrejean ,
B. Rémiat ,
M. Verdier  and
G. Passemard
F. Ciaramella
Affiliation:
CEA-DRT-LETI — CEA/GRE, 17 rue des Martyrs, 38054 Grenoble cedex 9, France
V. Jousseaume
Affiliation:
CEA-DRT-LETI — CEA/GRE, 17 rue des Martyrs, 38054 Grenoble cedex 9, France
S. Maitrejean
Affiliation:
CEA-DRT-LETI — CEA/GRE, 17 rue des Martyrs, 38054 Grenoble cedex 9, France
B. Rémiat
Affiliation:
CEA-DRT-LETI — CEA/GRE, 17 rue des Martyrs, 38054 Grenoble cedex 9, France
M. Verdier
Affiliation:
LTPCM, Domaine Universitaire, 1130 rue de la Piscine, 38402 Saint Martin d'Hères, France
G. Passemard
Affiliation:
STMicroelectronics, 850 rue Jean Monnet, 38926 Crolles, France
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Abstract

Semiconductor industry needs a continuously improvement of integrated circuits performance and an increase of integrated density on silicon. The 2004 ITRS Roadmap underlines the need of dielectric material for ILD with dielectric constant (k) lower than 3 for the 90 nm node and than 2.4 for the 45 nm node. In this work, porous films with k value lower than 2.2 were processed using a porogen approach. Firstly, a material composed of a methylsilsesquioxane (MSQ) matrix and of organic nanoparticles (called porogen) is deposited and baked. Then, this composite is thermally cured to allow the porogens degradation and matrix crosslinking. Different k values were obtained by varying the porogen loading in the composite. Mechanical properties of composite and porous films (before and after porogen removal respectively) were investigated using nanoindentation and FTIR analysis for different porogen loadings (between 0 and 40 %). The composite modulus is higher than the porous film modulus for high porogen loading. This result is interpreted in term of matrix crosslinking. Mechanical properties were also modelized using foam mechanical models. For high porosity level, the best Young modulus fitting is obtained with tetrakaidecaedric cells, which seems in good agreement with porosity morphology.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 863: Symposium B – Materials, Technology and Reliability of Advanced Interconnects , 2005 , B1.4
Copyright
Copyright © Materials Research Society 2005

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