Stacked Capacitor Electrode Structure for Lower Resistance Memory Chips
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Solution Overview
Problem
The increasing demand for faster operating speeds and lower power consumption in semiconductor devices necessitates higher integration densities while maintaining reliability, which poses challenges in optimizing electrical characteristics and reducing form factor.
Innovation Solution
The semiconductor device incorporates a cell chip with a first semiconductor substrate, a device layer, a dielectric layer, and stacked electrodes with a top electrode and additional electrode of varying conductivity, along with contacts penetrating the substrate and insulating layers to enhance electrical connectivity and reduce resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If integration density is increased to achieve faster operating speed and lower power consumption, then operating speed and power consumption are improved, but device reliability deteriorates due to increased complexity and reduced margin for error
Solution Approach 1:
The patent employs composite electrode structures combining different materials (e.g., copper and tungsten, or various metal layers) to achieve optimal electrical properties. This allows high integration density with improved reliability through material diversity that compensates for the stresses of high-density integration
Solution Approach 2:
The patent applies different materials and structures to different regions of the device based on local requirements. For example, specific electrode configurations are used in high-stress areas versus lower-stress areas, allowing optimization of both performance and reliability in different device regions
2Area of moving object
If integration density is increased to reduce form factor, then device size is reduced, but electrical characteristics deteriorate due to increased resistance and reduced signal integrity
Solution Approach 1:
The patent transitions from planar electrode arrangements to three-dimensional stacked configurations. Multiple electrode layers are stacked vertically with dielectric layers in between, enabling high integration density in a compact footprint while maintaining electrical performance through vertical rather than horizontal expansion
Solution Approach 2:
The patent uses composite electrode structures with multiple material layers (such as copper/tungsten combinations or gradient metal stacks) that provide both low resistance for compact design and high reliability for signal integrity in high-density configurations
3Reliability
If electrode resistance is reduced to improve electrical characteristics, then signal transmission speed is improved, but device complexity increases due to additional electrode layers and materials
Solution Approach 1:
The patent divides the electrode structure into multiple discrete layers with distinct functions. Each layer serves a specific purpose (e.g., current distribution, low-resistance path, mechanical support), allowing the complex structure to be managed through modular design and standardized fabrication processes
Solution Approach 2:
The patent optimizes electrode resistance by changing material parameters (conductivity, thickness) and geometric parameters (cross-sectional area, path length) in a systematic way. This allows resistance reduction through controlled parameter adjustments rather than uncontrolled complexity increases
Data Source
AI summary
A semiconductor device may include a cell chip and a core/peripheral chip on the cell chip. The cell chip may include a first semiconductor substrate, a first device layer disposed on the first semiconductor substrate, a bottom electrode disposed on the first device layer, a dielectric layer conformally covering a top surface of the first device layer and the bottom electrode, a top electrode disposed on the bottom electrode and spaced apart from the bottom electrode by the dielectric layer, an insulating layer provided on the first device layer to cover the top electrode, and a first contact vertically penetrating one of the first semiconductor substrate or the insulating layer and connected to the top electrode. The top electrode may include a semiconductor layer and a metal layer that are stacked, and the first contact may be in contact with the metal layer.