Wafer-Level Buffer Layer for BEOL Dielectric Dicing Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Integrated circuits (ICs) face reliability issues due to micro-cracking in low-k dielectric layers during the wafer singulation process, which are difficult to detect and lead to die-level interconnect failures, impacting yields and package reliability.
Innovation Solution
A buffer layer with a vibration damping composition is applied on the active surface of the die, featuring a specific Young's Modulus and Breaking Strength to prevent cracking of the BEOL dielectric during dicing, comprising a tunable composite buffer layer with fillers that absorb and dissipate vibration, reducing the risk of micro-cracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a buffer layer with vibration damping composition is applied on the active surface of the die, then cracking and chipping in the BEOL dielectric during dicing are reduced, but device complexity increases
Solution Approach 1:
A buffer layer is introduced as an intermediary component between the BEOL dielectric and the dicing process. This buffer layer absorbs and dissipates vibration during dicing, preventing direct transmission of mechanical stress to the brittle low-k dielectric layers, thereby reducing micro-cracking while maintaining a relatively simple overall device structure.
Solution Approach 2:
The buffer layer is applied beforehand on the active surface of the die before the dicing process. It provides pre-positioned vibration damping and shock absorption capability, cushioning the BEOL dielectric against cracking during subsequent mechanical cutting operations, thus improving reliability without requiring complex post-processing structures.
2Reliability
If the buffer layer uses a vibration damping composition with specific Young's Modulus and Breaking Strength, then micro-cracking is prevented, but manufacturing precision requirements increase
Solution Approach 1:
The buffer layer is designed with specific controllable parameters including Young's Modulus and Breaking Strength that are optimized for vibration damping. By adjusting these material parameters within defined ranges, the buffer layer effectively prevents micro-cracking in the BEOL dielectric while maintaining manageable manufacturing precision requirements through parameter optimization rather than extreme precision control.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The buffer layer effectively reduces cracking and chipping in the BEOL dielectric during dicing, enhancing the reliability and yield of ICs by absorbing and dissipating vibration, thus preventing micro-cracking and improving package reliability.
Implementation Method 1
The buffer layer includes a vibration damping composition to prevent cracking of the BEOL dielectric from a wafer singulation process
Data Source
AI summary
A wafer-level buffer layer is disclosed. The wafer-level buffer layer is configured to prevent cracking and chipping the back-end-of-line (BEOL) dielectric during wafer singulation process. The wafer-level buffer layer is a composite wafer-level buffer layer with a vibration damping agent. The vibration damping agent includes a polymer-based base layer with fillers. The damping agent absorbs or dampens the vibration of the saw blade during dicing to prevent cracking and chipping of the BEOL dielectric.