MIM Capacitor Layout With Isolated Plates for Breakdown Reliability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for forming MIM capacitors in semiconductor manufacturing result in reliability concerns such as electromigration failure and time-zero short/time-dependent dielectric breakdown due to non-conformal electrode metal and insulators, leading to 'steps' or surfaces with multiple levels.
Innovation Solution
The proposed solution involves forming a MIM capacitor with metal layers and insulators that have a single upper and lower horizontal surface, eliminating 'steps' by using isolated portions of the metal layers surrounded by dielectric isolation on all vertical side surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional MIM capacitor formation methods are used, then manufacturing process is simpler, but reliability deteriorates due to electromigration failure and time-zero short
Solution Approach 1:
The capacitor structure is segmented into multiple plates (first plate, second plate, third plate) with isolated portions, where each plate is separated by dielectric layers. This segmentation eliminates the formation of steps and non-conformal surfaces, thereby improving reliability by preventing electromigration and time-zero short while maintaining a manageable manufacturing complexity through modular construction
Solution Approach 2:
Dielectric isolation is applied locally at specific regions where plates intersect or adjacent to each other, rather than uniformly across the entire structure. This localized dielectric isolation针对性地 addresses the reliability issues at critical interfaces without unnecessarily increasing overall structural complexity, achieving improved reliability with minimal added complexity
2Reliability
If conventional MIM capacitor formation methods are used, then manufacturing process is simpler, but time-dependent dielectric breakdown occurs
Solution Approach 1:
Dielectric material is introduced as an intermediary substance between adjacent metal plates and at plate intersections. This dielectric intermediary prevents direct contact between conductive plates, eliminating pathways for time-dependent dielectric breakdown while containing the added structural complexity only to the isolation regions rather than the entire capacitor structure
3Reliability
If capacitor size is reduced for high frequency applications, then series resistance decreases, but capacitance density requirements become more challenging
Solution Approach 1:
The capacitor design transitions from planar two-dimensional structures to three-dimensional multi-plate configurations with vertical stacking. By adding the vertical dimension with multiple plates separated by dielectric layers, the capacitance density increases significantly without proportionally increasing the horizontal footprint, enabling high frequency performance with reduced series resistance while achieving required capacitance density
Data Source
AI summary
A semiconductor device including a metal insulator metal capacitor (MIM capacitor), a first via connected to and through a bottom plate of the MIM, and a middle plate of the MIM, where a middle isolated portion of the middle plate of the MIM surrounds the first via. A MIM capacitor, a first via connected to and through a bottom plate of the MIM, and a middle plate of the MIM, where a middle isolated portion of the middle plate of the MIM surrounds the first via, where the middle isolated portion is surrounded by a middle isolation dielectric on all vertical side surfaces. Forming a MIM capacitor, forming a first via connected to and through a bottom plate of the MIM, and forming a middle plate of the MIM, where a middle isolated portion of the middle plate of the MIM surrounds the first via.