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Reduction of intrinsic stresses during the chemical vapor deposition of diamond

Published online by Cambridge University Press:  31 January 2011

Sumit Nijhawan
Affiliation:
Division of Engineering, Brown University, Providence, Rhode Island 02912
Susan M. Jankovsky
Affiliation:
Division of Engineering, Brown University, Providence, Rhode Island 02912
Brian W. Sheldon
Affiliation:
Division of Engineering, Brown University, Providence, Rhode Island 02912
Barbara L. Walden
Affiliation:
Physics Department, Trinity College, Hartford, Connecticut 06106
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Abstract

Intrinsic stresses which arise during the chemical vapor deposition (CVD) of diamond were controlled by multistep processing. Film stresses (thermal and intrinsic) were measured with the bending plate method. The thermal stresses are compressive and arise due to the mismatch in thermal expansion coefficient between the film and substrate. The dominant intrinsic stresses are tensile and evolve during the deposition process. These stresses increase with deposition time. An intermediate step consisting of annealing the film when the diamond crystallites are only partially coalesced reduces the intrinsic stress by more than 50%. Annealing at longer growth times (i.e., after complete coalescence) does not produce large reductions in intrinsic stress. Our results are consistent with stress generation due to the formation of nonequilibrium grain boundary structures. The intermediate annealing step does not produce a large, direct stress reduction; instead, it alters the film microstructure in some subtle way which reduces stress generation during subsequent growth.

Type
Articles
Copyright
Copyright © Materials Research Society 1999

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