Memory Chip Bonding Electrode Layout for Alignment Tolerance
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Solution Overview
Problem
Existing semiconductor memory devices face challenges in efficiently bonding chips due to non-uniform placement densities of bonding electrodes, leading to uneven surfaces and misalignment during bonding processes.
Innovation Solution
The semiconductor memory device employs a manufacturing method where trenches for bonding electrodes are formed with uniform placement densities across the entire surface of the wafers, ensuring consistent electrode arrangement and reducing surface unevenness. Additionally, the bonding electrodes on the chips are arranged with specific widths and placement patterns to accommodate misalignment margins during bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If bonding electrodes are placed with uniform density across the entire wafer surface, then surface unevenness is reduced and alignment is improved, but the manufacturing process complexity increases due to precise trench formation requirements
Solution Approach 1:
The wafer surface is divided into multiple regions with trenches formed at regular intervals. Each trench serves as a discrete bonding electrode placement zone, enabling uniform distribution of bonding electrodes across the entire surface. This segmentation approach ensures consistent spacing and alignment while simplifying the overall placement process.
Solution Approach 2:
Trenches are pre-formed on the wafer surface before bonding electrode placement. This preliminary action creates predetermined positions that guide subsequent bonding electrode alignment, eliminating the need for complex real-time positioning during the bonding process and ensuring uniform distribution.
2Reliability
If bonding electrodes are arranged with specific widths and placement patterns to accommodate misalignment margins, then bonding reliability is improved, but the electrode arrangement complexity increases
Solution Approach 1:
Extra margin spaces are intentionally incorporated into the electrode arrangement pattern before bonding occurs. These pre-planned cushion zones accommodate potential misalignments during the bonding process, ensuring that even with positional variations, reliable bonding is achieved without requiring complex active compensation mechanisms.
Solution Approach 2:
Different regions of the wafer surface have locally optimized electrode patterns tailored to their specific bonding requirements. Each local area features electrode widths and spacing designed to accommodate expected misalignment margins for that particular region, providing localized reliability without complicating the entire device structure.
Data Source
AI summary
A semiconductor memory device includes first and second chips. The first chip includes a first region and a second region. The first region includes memory cells, bit lines, word lines, and first bonding electrodes electrically connected to bit lines. The second region includes contacts electrically connected to word lines and second bonding electrodes electrically connected to contacts. The first bonding electrodes include a third bonding electrode and a fourth bonding electrode adjacent. The second bonding electrodes include a fifth bonding electrode and a sixth bonding electrode adjacent. A distance from a center position of the third bonding electrode to a center position of the fourth bonding electrode and a distance from a center position of the fifth bonding electrode to a center position of the sixth bonding electrode are matched in a range of from 90% to 110%.