Ms. Samira farsinezhad Profile

Samira farsinezhad

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SPIE Journal Paper | 17 June 2015

Mapping stresses in high aspect ratio polysilicon electrical through-wafer interconnects

Himani Sharma, Joshua Krabbe, Samira Farsinezhad, Andy van Popta, Nick Wakefield, Glen A. Fitzpatrick, Karthik Shankar

JM3, Vol. 14, Issue 02, 024001, (June 2015) https://doi.org/10.1117/12.10.1117/1.JMM.14.2.024001

KEYWORDS: Semiconducting wafers, Micro raman spectroscopy, Raman spectroscopy, Silicon, Copper, Microelectromechanical systems, Deep reactive ion etching, Low pressure chemical vapor deposition, Annealing, Boron

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Electrical through-wafer interconnect technologies such as vertical through-silicon vias (TSVs) are essential in order to maximize performance, optimize usage of wafer real estate, and enable three-dimensional packaging in leading edge electronic and microelectromechanical systems (MEMS) products. Although copper TSVs have the advantage of low resistance, highly doped polysilicon TSVs offer designers a much larger range of processing options due to the compatibility of polysilicon with high temperatures and also with the full range of traditional CMOS processes. Large stresses are associated with both Cu and polysilicon TSVs, and their accurate measurement is critical for determining the keep-out zone (KOZ) of transistors and for optimizing downstream processes to maintain high yield. This report presents the fabrication and stress characterization of 400-μm deep, 20-Ω resistance, high aspect ratio (25:1) polysilicon TSVs fabricated by deep reactive ion etching (DRIE) followed by low-pressure chemical vapor deposition (LPCVD) of polysilicon with in-situ boron doping. Micro-Raman imaging of the wafer surface showed a maximum stress of 1.2 GPa occurring at the TSV edge and a KOZ of ∼9 to 11 μm. For polysilicon TSVs, the stress distribution in the TSVs far from the wafer surface(s) was not previously well-understood due to measurement limitations. Raman spectroscopy was able to overcome this limitation; a TSV cross section was examined and stresses as a function of both depth and width of the TSVs were collected and are analyzed herein. An 1100°C postanneal was found to reduce average stresses by 40%.

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