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Related Concept Videos

Singularity Functions for Shear01:26

Singularity Functions for Shear

In structural analysis, singularity functions are crucial in simplifying the representation of shear forces in beams under discontinuous loading. These functions describe discontinuous variations in shear force across a beam with varying loads by using a single mathematical expression, regardless of the complexity of the loading conditions. The singularity functions are derived from creating a free-body diagram of the beam and then making conceptual cuts at specific points to examine the shear...
Singularity Functions for Bending Moment01:18

Singularity Functions for Bending Moment

Singularity functions simplify the representation of bending moments in beams subjected to discontinuous loading, allowing the use of a single mathematical expression. For a supported beam AB, with uniform loading from its midpoint M to the right side end B, the approach involves conceptual 'cuts' at specific points to determine the bending moment in each segment. By cutting the beam at a point between A and M, the bending moment for the segment before reaching midpoint M is represented using a...
Unsymmetric Loading of Thin-Walled Members01:23

Unsymmetric Loading of Thin-Walled Members

Thin-walled members with non-symmetrical cross-sections are vital to engineering structures, offering material efficiency and structural integrity. However, unsymmetrical loading on these members leads to complex stress distributions, resulting in simultaneous bending and twisting can cause deformation or structural failure. The interaction between bending and twisting requires detailed analysis to ensure structural resilience.
The concept of the shear center is crucial in countering the...
Unsymmetric Loading of Thin-Walled Members: Problem Solving01:07

Unsymmetric Loading of Thin-Walled Members: Problem Solving

The shear center of a channel section with uniform thickness, height, and width, is determined by computing the shear force in the member and calculating the moments of inertia of the sections.
To compute the shear forces, find the shear flow at a specific distance from the endpoint using the vertical shear and the moment of inertia values. The total shear force on the flange is calculated by integrating the shear flow from one end of the flange to the other.
Next, calculate the moments of...
Deflection of a Beam01:19

Deflection of a Beam

Accurately determining beam deflection and slope under various loading conditions in structural engineering is crucial for ensuring safety and structural integrity. Singularity functions offer a streamlined approach to analyzing beams, especially when multiple loading functions complicate the bending moment equation.
Singularity functions, described in an earlier lesson, are powerful mathematical tools that represent discontinuities within a function commonly encountered in structural loading...
Modeling and Similitude01:12

Modeling and Similitude

Scaled modeling is a fundamental technique in engineering, enabling the study of large and complex systems by creating smaller, manageable replicas that recreate critical characteristics of the original. In hydrology and civil infrastructure, for example, scaled models of dams help analyze water flow, turbulence, and pressure. This method allows for accurate predictions of real-world behavior within a controlled environment, significantly reducing the cost and time involved in full-scale...

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Related Experiment Video

Updated: Jul 6, 2026

Fabrication of Uniform Nanoscale Cavities via Silicon Direct Wafer Bonding
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Si Characterization on Thinning and Singulation Processes for 2.5/3D HBM Package Integration.

MiKyeong Choi1, SeaHwan Kim1, TaeJoon Noh1

  • 1School of Advanced Materials Science & Engineering, Sungkyunkwan University, 2066 Seobu-ro, Jangan-gu, Suwon 16419, Republic of Korea.

Materials (Basel, Switzerland)
|November 27, 2024
PubMed
Summary

Optimizing silicon (Si) wafer thinning and singulation is crucial for advanced semiconductor packaging. Polishing for thinning and stealth dicing for singulation yield the highest fracture strength in Si chips, enhancing reliability.

Keywords:
2.5D/3D integrationFWMHRaman analysisSi wafersemiconductor packagesingulationthinning

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Area of Science:

  • Materials Science
  • Semiconductor Manufacturing

Background:

  • Advanced semiconductor packaging relies on 2.5D and 3D stacking technologies.
  • Wafer thinning and singulation are critical for producing thinner, reliable Si chips, but their impact on chip integrity requires further research.

Purpose of the Study:

  • To systematically compare the effects of wafer thinning and singulation processes on the fracture strength of Si wafers.
  • To identify optimal processing techniques for enhancing Si chip reliability in advanced packaging.

Main Methods:

  • Wafer thinning using fine grinding, poly-grinding, and polishing.
  • Surface morphology and roughness analysis via scanning electron microscopy and interferometry.
  • Residual stress measurement using Raman spectroscopy.
  • Fracture strength assessment via three-point bending tests.
  • Singulation methods evaluated: blade dicing, laser dicing, and stealth dicing.

Main Results:

  • Polishing resulted in minimal residual stress and surface defects, leading to the highest fracture strength in thinned Si wafers and chips.
  • Thinner wafers (60 µm) exhibited higher fracture strength than thicker ones (90 µm, 120 µm) due to increased flexibility.
  • Stealth dicing provided superior fracture strength compared to blade and laser dicing.

Conclusions:

  • Combining wafer thinning via polishing and singulation via stealth dicing offers an optimal approach for high-reliability Si chip production.
  • These findings provide valuable guidance for selecting processing technologies in industrial settings for 2.5D and 3D packaging.