Integral Fluorescent Alignment Marks for Wafer Bonding Precision
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Solution Overview
Problem
The scaling down of semiconductor devices poses challenges in achieving improved quality, yield, performance, and reliability, particularly in the wafer bonding process due to the complexity and precision required.
Innovation Solution
The integration of fluorescence material-based alignment marks on semiconductor wafers, which are arranged parallel to each other and serve as references during bonding, enhancing optical recognition and yield reliability through complementary design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional alignment marks are used during wafer bonding, then the bonding process can proceed, but optical recognition is insufficient leading to reduced yield and reliability
Solution Approach 1:
The patent applies fluorescence materials to alignment marks, which change their optical properties by emitting light at a different wavelength than the excitation light. This makes the alignment marks highly visible and easily detectable during wafer bonding processes, directly improving optical recognition while maintaining reliability
Solution Approach 2:
The patent changes the optical parameters of alignment marks by using fluorescent materials that exhibit specific emission characteristics. By selecting materials with appropriate emission wavelengths and intensities, the alignment marks become significantly easier to detect optically, resolving the contradiction between detection difficulty and reliability
2Productivity
If scaling down is pursued to improve computing ability, then device performance improves, but manufacturing complexity and precision requirements increase
Solution Approach 1:
Fluorescent alignment marks provide high-contrast optical signals that enable precise alignment even at scaled dimensions. The bright emission properties allow for accurate detection and positioning, maintaining manufacturing precision requirements despite device scaling
Solution Approach 2:
The patent replaces mechanical alignment methods with optical detection using fluorescence. This substitution enables non-contact, high-precision alignment measurements that are suitable for scaled devices where mechanical tolerances become increasingly difficult to maintain
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 use of fluorescence material in alignment marks improves optical recognition during wafer bonding, leading to increased yield and reliability of semiconductor devices by providing precise references for the bonding process.
Implementation Method 1
The plurality of first alignment marks and the plurality of second alignment marks comprise a fluorescence material
Data Source
AI summary
The present application discloses a semiconductor device having integral alignment marks with decoupling features and a method for fabricating the semiconductor device. The semiconductor device includes a substrate; a dielectric stack positioned on the substrate; two conductive features positioned in the dielectric stack; a decoupling unit positioned in the dielectric stack, between the two second conductive features, and comprising a bottle-shaped cross-sectional profile; and an alignment mark positioned on the decoupling unit. The alignment mark comprises a fluorescence material.