Interposer MOM Capacitor Layout With Doped Leakage Barriers
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Solution Overview
Problem
The integration of metal-oxide-metal (MOM) capacitors in interposers for 3D ICs leads to metal residue smearing, creating leakage paths that affect the capacitors' performance.
Innovation Solution
Incorporating doped regions around connecting structures in the interposer substrate to act as barriers, blocking leakage paths and mitigating the issue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If MOM capacitors are integrated in interposers for 3D ICs, then circuit density is increased, but metal residue smearing creates leakage paths that worsen reliability
Solution Approach 1:
A doped region is introduced as an intermediary barrier structure between the metal residue source and the capacitor electrodes. This doped region acts as a mediator that blocks the leakage path created by metal residue smearing, allowing the MOM capacitor integration to proceed while mitigating the reliability issue.
Solution Approach 2:
The doped region is intentionally created in the substrate, and its electrical properties are leveraged to convert the harmful leakage effect into a beneficial blocking function. The doping process that could be seen as an additional manufacturing step is transformed into a solution that actively prevents leakage currents.
2Reliability
If doped regions are added around connecting structures, then leakage paths are blocked improving reliability, but device complexity increases
Solution Approach 1:
The doped regions are applied locally only around the connecting structures where metal residue smearing occurs, rather than throughout the entire substrate. This localized approach provides the necessary leakage protection while minimizing the increase in overall device complexity.
Solution Approach 2:
The doped regions are formed in advance during the substrate preparation phase, before the capacitor assembly is complete. This preliminary action ensures that the leakage blocking function is already in place to prevent future leakage issues without requiring additional complex steps later in the manufacturing process.
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 doped regions effectively obstruct leakage currents, enhancing the reliability and performance of the semiconductor package structures by preventing electrical shorts.
Implementation Method 1
The doped region effectively obstruct leakage currents, enhancing the reliability and performance of the semiconductor package structures by preventing electrical shorts
Data Source
AI summary
A semiconductor structure includes a substrate, a capacitor disposed in the substrate, an interconnect structure disposed over the substrate, and a first doped region disposed in the substrate. The interconnect structure includes a first via structure coupled to the substrate, and a second via structure coupled to the capacitor. The first doped region is disposed under the first via structure. The first doped region includes p-type or n-type dopants.