MIM Capacitor Via Layout With Merged Top Metal to Prevent Cracking
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Solution Overview
Problem
Existing configurations of contact via areas in metal-insulator-metal (MIM) capacitors are inadequate for advanced IC technologies, leading to stress-induced damage and cracking, particularly due to exposed dielectric layers during patterning of multiple conductor plate layers.
Innovation Solution
The proposed solution involves merging top conductor plate layers through which adjacent contact vias extend, thereby covering the dielectric layer between them, reducing the area of exposure and minimizing stress-induced damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If contact vias are formed through multiple conductor plate layers of MIM capacitors, then electrical connectivity is achieved, but stress-induced damage and cracking occur due to exposed dielectric layers during patterning
Solution Approach 1:
The patent merges adjacent top conductor plate layers into a single continuous layer that extends over the dielectric regions between contact vias. This merging configuration covers the exposed dielectric layers, eliminating the harmful stress concentration points and preventing cracking during subsequent patterning processes, thereby resolving the contradiction between achieving electrical connectivity and preventing stress-induced damage
2Productivity
If geometry sizes of semiconductor devices are decreased to increase functional density, then production efficiency improves, but complexity of processing and manufacturing increases
Solution Approach 1:
By merging adjacent top conductor plate layers into a single continuous structure, the patent simplifies the manufacturing process for advanced IC technologies. This merging approach reduces the number of discrete patterning steps required, decreases processing complexity, and enables easier fabrication of high-density MIM capacitor structures without sacrificing production efficiency
Data Source
AI summary
Via array configurations for metal-insulator-metal (MIM) capacitor structures are disclosed herein. An exemplary MIM capacitor structure includes a capacitor bottom metal layer, a first dielectric layer over the capacitor bottom metal layer, a capacitor middle metal layer over the first dielectric layer, a second dielectric layer over the capacitor middle metal layer, and a capacitor top metal layer over the second dielectric layer. A metal via array, which has a first metal via and a second metal via, is connected to the capacitor top metal layer and the capacitor bottom metal layer. A portion of the capacitor top metal layer covers an area of the second dielectric layer extending from the first metal via to the second metal via. From a top view, the portion of the capacitor top metal layer surrounds the first metal via and the second metal via.