Wafer Failure Analysis for Yield Enhancement

~ table of contents ~    .  
Introduction, see more…

Failure Analysis Approach
Problem Statement
Verify and Characterize the Failure
Failure Analysis Procedures

Yield Reduction Mechanisms
  .
Desi
Design
Pro  Process

Metal Etch Polymer
Example:  Corrosion Cotton Balls

Oxide Etch Polymer
Example #1:  Open Vias

Example #2:  Onion Rings

Stringers
Example #1:  Residual Material In Crevices

Example #2:  Material Trapped Under Ledge
Example #3:  Residual Poly 2 Causes High Leff

        Test
        Assembly

Electrical Fault Localization

Semiconductor Test Parametrics (Test Structures)
Test Binning
Curve Tracer
IDD, IDDQ
Shmoo Plotting
Loop on Problem Vectors

Physical Fault Localization

Mechanical Probing
Liquid Crystal Hot Spot Detection

Purpose
Theory
Device Failure Characteristics
Equipment
Hot Spot Detection Procedure
Liquid Crystal Application – A Final Result
Procedure Variations

Emission Microscopy
SEM Techniques

High Energy Passive Voltage Contrast

Sample Preparation Techniques

Non-encapsulated Cross Section Basics

Purpose
Background and Theory
Equipment
Procedure
General Comments

Wet Etch Passivation Removal

Example #1: A Construction Overview
Example #2: Isolation of Circuit Elements

Analytical Techniques / Contract Services

Energy Dispersive Spectroscopy (EDS)
Wavelength  Dispersive Spectroscopy (WDS)
Auger Electron Spectroscopy (AES)
Secondary Ion Mass Spectrometry (SIMS)
Fourier Transfer Infrared Spectrometry (FTIR)
X-ray Photoelectron Spectroscopy (XPS)
X-ray Fluorescence (XRF)
Rutherford Backscattering Spectroscopy (RBS)
Scanning Tunneling Microscopy (STM)
Scanning Probe Microscopy (SPM)

Equipment Considerations – In house / Off site

Liquid Crystal Analysis

Appendices

Glossary
Resources

 

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