Deteriorated device characteristics in 3D-LSI caused by distorted silicon lattice

Murugesan Mariappan, Yasuhiko Imai, Shigeru Kimura, Takafumi Fukushima, Ji Choel Bea, Hisashi Kino, Kang Wook Lee, Tetsu Tanaka, Mitsumasa Koyanagi

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Silicon-lattice distortion in the 50-μ-thick stacked large scale integrated circuit (LSI) chip over Cu-Sn μ-bumps was studied by synchrotron-assisted micro-X-ray diffraction. The top and bottom surfaces of the upper chip experienced 0.25% and 0.1% tensile strain (equivalent to 450 and 200 MPa of tensile stress), respectively. Si [004] plane showed a maximum tilt value of +0.45° and -0.25°, respectively, over the μ-bump and in the bump-space region. Raman spectroscopy revealed that upper stacked chip experienced ∼1000 MPa of tensile stress and ∼200 MPa of compressive stress, respectively, over the μ-bump and bump-space regions. Distorted Si-lattice in 3D-LSIs caused 4% and 12% change in ON-current characteristic for n- and p-MOSFET devices, respectively.

Original languageEnglish
Article number6701183
Pages (from-to)540-547
Number of pages8
JournalIEEE Transactions on Electron Devices
Volume61
Issue number2
DOIs
Publication statusPublished - 2014 Feb

Keywords

  • 3D-large scale integrated circuit (LSI)
  • Microbump
  • Si-lattice distortion

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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