Integration of stacked capacitor module with ultra-thin ferroelectric SrBi2Ta2O9 film for high density ferroelectric random access memory applications at low voltage operation

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

  • Manfred Moert - , Infineon Technologies AG (Author)
  • Thomas Mikolajick - , Infineon Technologies AG (Author)
  • Guenther Schindler - , Infineon Technologies AG (Author)
  • Nicolas Nagel - , Infineon Technologies AG (Author)
  • Igor Kasko - , Infineon Technologies AG (Author)
  • Walter Hartner - , Infineon Technologies AG (Author)
  • Christine Dehm - , Infineon Technologies AG (Author)
  • Hermann Kohlstedt - , Jülich Research Centre (Author)
  • Rainer Waser - , RWTH Aachen University (Author)

Abstract

The crystallization route of thin SrBi2Ta2O 9 (SBT) films deposited on Pt(100 nm)/Ti(10 nm)/SiO2/Si substrate is investigated at different annealing temperatures by atomic force microscopy (AFM) and X-ray diffractometry (XRD). To evaluate the SBT film properties for low voltage operation and for high storage density (>16 MBit), SBT is deposited at different film thicknesses. Furthermore, the performance of a Pt/SBT/Pt capacitor on a barrier-/contact-layer/polysilicon-plug architecture suitable for stacked capacitor memories is investigated by transmission electron microscopy (TEM)/energy dispersive X-ray analysis (EDX) and electrical measurements. It is shown that an oxidized and highly resistive contact layer can be recovered by electrical pulses. Finally, a process solution for a successful integration of 38 nm thin SBT films into this structure is provided. Published by Eisevier B.V.

Details

Original languageEnglish
Pages (from-to)328-334
Number of pages7
JournalThin solid films
Volume473
Issue number2
Publication statusPublished - 2005
Peer-reviewedYes
Externally publishedYes

External IDs

ORCID /0000-0003-3814-0378/work/155840915

Keywords

Keywords

  • Crystallization, Electrical properties and measurements, Ferroelectric properties, Strontium bismuth tantalate (SBT)