Composite Dielectric Gap Fill for Semiconductor Warpage Buffering
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Solution Overview
Problem
Three-dimensional semiconductor devices experience stress-induced warpage due to mismatched materials between semiconductor dies and the silicon wafer, leading to deformation and potential cracking during cooling processes after high-temperature processing.
Innovation Solution
A warpage defense gap fill structure is introduced, using a combination of dielectric materials with varying densities and a void region filled with gas, such as air or nitrogen, to mitigate stress and reduce deformation by acting as a 'buffer' between semiconductor dies, thereby controlling thermal expansion and preventing cracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single dielectric material is used to fill the region between semiconductor dies, then the manufacturing process is simple, but stress-induced warpage and deformation occur due to mismatched thermal expansion coefficients
Solution Approach 1:
The patent applies composite materials by using multiple dielectric materials with different densities in the gap fill structure. The first dielectric material has a first density and the second dielectric material has a second density different from the first, creating a composite structure that better matches the thermal expansion characteristics of the semiconductor dies and reduces stress-induced warpage during cooling after high-temperature processing.
Solution Approach 2:
The patent applies local quality by positioning dielectric materials with different densities at different locations within the gap fill structure. The column of second dielectric material is specifically positioned within the first dielectric material to provide localized stress compensation where needed most, rather than using a uniform material throughout the entire gap region.
2Reliability
If high-temperature processing is performed to improve device performance, then device functionality is enhanced, but stress-induced warpage and cracking occur during cooling
Solution Approach 1:
The patent applies beforehand cushioning by incorporating a void region filled with gas (air or nitrogen) within the column of second dielectric material. This void region acts as a buffer that can accommodate thermal expansion and contraction stresses during high-temperature processing and cooling, preventing stress-induced warpage and cracking before they occur.
Solution Approach 2:
The patent applies parameter changes by introducing a void region with gas filling that has different thermal expansion properties compared to solid dielectric materials. The gas-filled void can compress and expand more readily during temperature cycling, changing the mechanical parameters of the gap fill structure to better accommodate thermal stresses during high-temperature processing.
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 effectively reduces stress-induced warpage and deformation in semiconductor devices, enhancing their stability and reliability by using a composite dielectric material structure that manages thermal expansion and provides a mechanical buffer, thus improving the integrity of the semiconductor device.
Implementation Method 1
A warpage defense gap fill structure is introduced, using a combination of dielectric materials with varying densities and a void region filled with gas, such as air or nitrogen, to mitigate stress and reduce deformation by acting as a 'buffer' between semiconductor dies, thereby controlling thermal expansion and preventing cracking.
Data Source
AI summary
A semiconductor device includes a first semiconductor die mounted on a substrate, a second semiconductor die mounted on the substrate and separated from the first semiconductor die, a first dielectric material between the first semiconductor die and the second semiconductor die and having a first density, and a column of second dielectric material in the first dielectric material, the second dielectric material having a second density different than the first density, and the second dielectric material including a void region.