Scribe-Region Test Electrode Layout for Cleaner Wafer Dicing
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Solution Overview
Problem
The existing methods for manufacturing semiconductor devices face challenges in improving the reliability of semiconductor devices, particularly during the cutting process of semiconductor substrates, where the dicing blade's width is often smaller than the connection portions of the testing electrode, leading to elongated metal patterns that can scatter and adhere onto the chip formation region, causing defects and reducing the manufacturing yield.
Innovation Solution
The method involves designing a testing electrode with pad portions wider than the dicing blade and connection portions arranged in a staggered manner, ensuring that the remaining cut-off pieces after dicing are shorter and less likely to adhere to the chip formation region, thereby enhancing the reliability and yield of the semiconductor device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the dicing blade width is made smaller to improve cutting precision, then the manufacturing precision is improved, but the connection portions of the testing electrode are cut into elongated metal patterns that can scatter and adhere to the chip formation region, causing defects and reducing reliability
Solution Approach 1:
The testing electrode is divided into multiple pad portions and multiple connection portions arranged in a staggered pattern. This segmentation ensures that when the dicing blade cuts through, it separates the connection portions into multiple short segments rather than creating one long continuous metal pattern, reducing the risk of adhesion to the chip formation region
Solution Approach 2:
The connection portions are arranged in a staggered asymmetric pattern rather than a linear symmetric arrangement. This asymmetric staggering ensures that the dicing blade cuts through different portions of the connection portions at different positions, creating shorter discontinuous metal patterns that are less likely to adhere to critical areas
2Reliability
If the connection portions are made wider to ensure proper electrical connection, then the electrical conductivity is improved, but the remaining cut-off pieces after dicing become longer and more likely to adhere to the chip formation region, causing defects
Solution Approach 1:
The connection portions are segmented into multiple separate sections arranged in a staggered pattern with pad portions between them. This segmentation ensures that even if individual connection portions are relatively wide for good electrical contact, the cut-off pieces after dicing are separated into multiple short segments rather than one long continuous piece, reducing adhesion risk
Solution Approach 2:
The pad portions act as intermediary elements between the connection portions. These pad portions are positioned such that they interrupt the continuity of metal patterns after dicing, serving as barriers that prevent elongated metal patterns from forming and adhering to the chip formation region
Data Source
AI summary
In a wafer test step, a dummy semiconductor element formed in a scribe region of a semiconductor substrate is inspected by using a testing electrode provided in the scribe region and electrically connected to the dummy semiconductor element. In a dicing step, the scribe region of the semiconductor substrate is cut by using a dicing blade. The testing electrode includes a plurality of pad portions and a plurality of connection portions connecting the plurality of pad portions to each other. A width of each of the plurality of connection portions is larger than a width of the dicing blade, and smaller than a width of each of the plurality of pad portions. In plan view, the plurality of pad portions is arranged in a linear manner in a moving direction of the dicing blade, and the plurality of connection portions is arranged in a staggered manner in the moving direction.