Wafer Chuck Zoning for Asymmetrical Wafer Bonding Control
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Solution Overview
Problem
Existing wafer bonding techniques are not entirely satisfactory, particularly in achieving optimal bonding for asymmetrical wafers and controlling bonding wave propagation, which can lead to trapped bubbles and poor overlay performance in stacked semiconductor devices.
Innovation Solution
A wafer bonding apparatus with independently controlled bonding pins or gas pressure modules in the wafer chucks, allowing for precise control of the bonding wave propagation and initial contact position based on wafer curvature, facilitating better control over the bonding process, especially for asymmetrical wafers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional wafer bonding techniques are used, then bonding can be achieved, but bonding wave propagation cannot be controlled and bubbles are trapped
Solution Approach 1:
The bonding chuck is divided into multiple independently controllable zones with individual pins or gas pressure modules. Each zone can be actuated separately to generate and control bonding wave propagation across the wafer surface, enabling precise control over the bonding process while eliminating trapped bubbles.
Solution Approach 2:
The bonding system transitions from static uniform pressure application to dynamic sequential actuation of bonding zones. The bonding pins or gas pressure modules are activated in a controlled sequence to propagate bonding waves across the wafer, allowing real-time control over bonding progression and bubble elimination.
2Adaptability or versatility
If uniform pressure is applied during bonding, then simple process control is maintained, but asymmetrical wafer bonding is poor
Solution Approach 1:
Different zones of the bonding chuck are equipped with independently controllable pins or gas pressure modules that can apply different pressures, timings, and durations to different regions of the wafer. This allows customization of bonding parameters for each local area, accommodating asymmetrical wafers with varying curvature and bonding requirements across their surfaces.
Solution Approach 2:
The bonding system is designed to intentionally apply asymmetric bonding forces and sequences tailored to the specific asymmetry of the wafers being bonded. The independent zone control enables the process to adapt to and exploit the asymmetric geometry of the wafers rather than forcing uniform bonding conditions.
3Manufacturing precision
If bonding pins are used to control bonding wave propagation, then overlay performance is improved, but device complexity increases
Solution Approach 1:
Gas pressure modules are integrated into the bonding chuck to provide controlled pressure application through gas flow. This pneumatic approach replaces or supplements mechanical pins, offering precise pressure control through flow regulation while reducing mechanical complexity and enabling more flexible zone control across the bonding surface.
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
This approach improves the bonding process by reducing bubble formation and enhancing overlay performance in Wafer-on-Wafer stacking, ensuring more efficient and reliable semiconductor device assembly.
Implementation Method 1
The bonding pins are accommodated in the first wafer chuck and configured to be movable through the first wafer chuck to apply pressure to bend the first wafer
Implementation Method 2
apply pressure to bend the first wafer, thereby causing bonding contact of the first wafer and the second wafer
Data Source
AI summary
A wafer bonding apparatus is provided. The wafer bonding apparatus includes a first wafer chuck, a second wafer chuck, and a plurality of bonding pins. The first wafer chuck is configured to hold a first wafer. The second wafer chuck is configured to hold a second wafer. The bonding pins are accommodated in the first wafer chuck and configured to be movable through the first wafer chuck to apply pressure to bend the first wafer, thereby causing bonding contact of the first wafer and the second wafer.