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Barium Strontium Titanate Capacitors for Embedded Dram

Published online by Cambridge University Press:  10 February 2011

Peter Zurcher ,
C.J. Tracy ,
R.E. Jones Jr ,
P. Alluri ,
P.Y. Chu ,
B. Jiang ,
M. Kim ,
B.M. Melnick ,
M.V. Raymond  and
D. Roberts
...Show all authors
Peter Zurcher
Affiliation:
Motorola, Materials Technology Laboratories, 3501 Ed Bluestein Blvd. MD:K10, Austin, Texas 78721, USA
C.J. Tracy
Affiliation:
Motorola, Materials Technology Laboratories, 3501 Ed Bluestein Blvd. MD:K10, Austin, Texas 78721, USA
R.E. Jones Jr
Affiliation:
2100 E. Elliot Road, MD:EL740, Tempe, Arizona 85284, USA
P. Alluri
Affiliation:
2100 E. Elliot Road, MD:EL740, Tempe, Arizona 85284, USA
P.Y. Chu
Affiliation:
2100 E. Elliot Road, MD:EL740, Tempe, Arizona 85284, USA
B. Jiang
Affiliation:
2100 E. Elliot Road, MD:EL740, Tempe, Arizona 85284, USA
M. Kim
Affiliation:
Motorola, Materials Technology Laboratories, 3501 Ed Bluestein Blvd. MD:K10, Austin, Texas 78721, USA
B.M. Melnick
Affiliation:
2100 E. Elliot Road, MD:EL740, Tempe, Arizona 85284, USA
M.V. Raymond
Affiliation:
2100 E. Elliot Road, MD:EL740, Tempe, Arizona 85284, USA
D. Roberts
Affiliation:
2100 E. Elliot Road, MD:EL740, Tempe, Arizona 85284, USA
T.P. Remmel
Affiliation:
Motorola, Materials Technology Laboratories, 3501 Ed Bluestein Blvd. MD:K10, Austin, Texas 78721, USA
T.L. Tsai
Affiliation:
Motorola, Materials Technology Laboratories, 3501 Ed Bluestein Blvd. MD:K10, Austin, Texas 78721, USA
B.E. White
Affiliation:
2100 E. Elliot Road, MD:EL740, Tempe, Arizona 85284, USA
S. Zafar
Affiliation:
2100 E. Elliot Road, MD:EL740, Tempe, Arizona 85284, USA
S.J. Gillespie
Affiliation:
2100 E. Elliot Road, MD:EL740, Tempe, Arizona 85284, USA
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Abstract

Long recognized as the best potential solution to the continued scaling of the onetransistor/one-capacitor standalone dynamic random access memory (DRAM) beyond a gigabit, barium strontium titanate (BST) and other high permittivity dielectrics are fast becoming enablers to embedding large amounts of memory into a high performance logic process. System requirements such as granularity, bandwidth, fill frequency, and power pose major challenges to the use of high density standalone DRAM, leading to the current push for embedded solutions where very wide buses are possible. As a result, projected embedded memory sizes are rapidly approaching that of the standalone products, and with the high wafer cost of the combined logic plus memory process, bit cell scaling is critical. The BST memory cell, with its low thermal budget processing, very high charge storage density, and high conductivity metal electrodes has the potential to be efficiently embedded with traditional logic flows if the materials and integration challenges of the required three dimensional (3D) bit cell capacitors can be solved. BST materials properties such as dielectric relaxation, interface capacitance, and resistance degradation and their impact on capacitor scaling will be reviewed along with the electrode materials issues associated with certain 3D capacitor designs. The scaling limits of BST bit cells in the deep sub-micron regime will be discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 541: Symposium O – Ferroelectric Thin Films VII , 1998 , 11
Copyright
Copyright © Materials Research Society 1999

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