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Optimization of the annealing process for the (Ba,Sr)TiO3 thin films grown by low-temperature (420 °C) metalorganic chemical vapor deposition

Published online by Cambridge University Press:  31 January 2011

Jaehoo Park ,
Cheol Seong Hwang  and
Doo Young Yang
Jaehoo Park
Affiliation:
Seoul National University, School of Materials Science and Engineering, San No. 56-1 Shillim-dong, Kwanak-ku, Seoul 151-742, Korea
Cheol Seong Hwang*
Affiliation:
Seoul National University, School of Materials Science and Engineering, San No. 56-1 Shillim-dong, Kwanak-ku, Seoul 151-742, Korea
Doo Young Yang
Affiliation:
Jusung Engineering Ltd., No. 49, Neungpyeong-Ri, Opo-Myeun, Kwangju, Kyunggi-Do 464-890, Korea
*
a)Address all correspondence to this author. e-mial: [email protected]
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Abstract

An optimization study on crystallization annealing of (Ba,Sr)TiO3 (BST) thin films, grown by metalorganic chemical vapor deposition at a wafer temperature of 420 °C, was performed. The as-grown film had an amorphous structure with a dielectric constant of about 20. The annealing parameters, including temperature, atmosphere, time, and sequence, were varied considering the limitations imposed by integration processes for ultralarge-scale integrated dynamic random access memory devices. The dielectric constants of the crystallized films were largely determined by the maximum temperature that the films experienced with minor effects from the annealing atmosphere. However, the leakage current densities were quite dependent on the annealing sequence and atmosphere. It was concluded that the major factors which determine leakage characteristics were concentrations of impurities, especially carbon, oxygen vacancies, and interfacial defects caused by top electrode sputtering.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 5 , May 2001 , pp. 1363 - 1371
Copyright
Copyright © Materials Research Society 2001

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References

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