Bonding Head Nozzle Contact Layout for Uniform Chip Heating
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Solution Overview
Problem
Temperature non-uniformity during thermal compression bonding of semiconductor components leads to bonding failures, particularly at the edges and corners, due to uneven heat distribution, resulting in insufficient melting of peripheral bump structures.
Innovation Solution
A thermal compression bonding head nozzle with modified contact areas, featuring recessed regions to redistribute heat flow and mitigate temperature non-uniformity, using a combination of recessed areas and varying thermal conductivity materials to balance heat distribution across the semiconductor component.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional thermal compression bonding head nozzle with uniform contact area is used, then the bonding process is simple and fast, but temperature non-uniformity occurs from center to corner causing bonding failures
Solution Approach 1:
The bonding head nozzle is designed with non-uniform contact areas including central contact areas, intermediate contact areas, and peripheral contact areas with different sizes and thermal conductivities. This local differentiation creates a tailored heat distribution pattern that compensates for the natural temperature gradient, ensuring uniform melting of bump structures across the entire semiconductor component surface.
Solution Approach 2:
The contact surface of the bonding head nozzle is segmented into multiple distinct contact areas (central, intermediate, peripheral) with different geometric and thermal properties. This segmentation allows independent optimization of heat transfer at different locations, transforming a uniform heat distribution problem into a controlled multi-zone thermal management system.
2Temperature
If the bonding head nozzle contacts the entire semiconductor component surface uniformly, then heat transfer is efficient, but temperature deviation occurs between central and peripheral bump structures
Solution Approach 1:
Different contact areas of the bonding head nozzle are designed with specific thermal conductivities and geometries to deliver localized heat transfer characteristics. Central contact areas may have higher thermal conductivity for intense heating, while peripheral areas adjust heat flow to prevent overheating, achieving uniform temperature distribution across the semiconductor component.
Solution Approach 2:
The thermal conductivity, area size, and geometric configuration of contact areas are varied across the bonding head nozzle surface. By changing these parameters spatially, the system optimizes heat transfer efficiency while maintaining temperature uniformity, preventing both under-heating at peripheries and overheating at centers.
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 solution achieves more uniform heat distribution, reducing bonding failures and enhancing the quality and reliability of chip stack packages by ensuring consistent melting of solder bumps across the semiconductor component.
Implementation Method 1
heat is transferred to a bump structure of the second chip to melt the bumps
Implementation Method 2
The first region includes at least one recessed area surrounded by a semiconductor component contacting area. The at least one recessed area prevents contact of the semiconductor component with the thermal compression bonding head nozzle.
Data Source
AI summary
A thermal compression bonding apparatus and assembly are provided in which the contact area between a thermal compression bonding head nozzle and a semiconductor component that is closest to the thermal compression bonding head nozzle has been modified/adjusted to mitigate temperature non-uniformity from the center to the corner of the semiconductor component. This mitigation in temperature non-uniformity improves the uniformity of bonding quality across the semiconductor package.