DRAM Capacitor Uneven Electrode Structure for Higher Capacitance Stability
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Solution Overview
Problem
The existing methods for increasing capacitance in DRAM capacitors, such as elongating columnar capacitors, lead to instability and risk of toppling, affecting storage performance due to reduced structural stability and electrical contact issues.
Innovation Solution
A semiconductor structure comprising a substrate with a first electrode layer, a dielectric layer, and a second electrode layer, where each layer has an uneven surface structure to increase surface area, improving capacitance and stability by forming a stacked columnar structure with staggered and arc-shaped or hemispheric protrusions and recessions, reducing the risk of electrical contact and enhancing charge storage uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the length of the columnar capacitor is increased to enlarge the surface area, then the capacitance is improved, but the structural stability deteriorates and the risk of toppling increases
Solution Approach 1:
The patent transitions from a simple columnar structure to a stacked columnar structure with multiple layers (first electrode layer, dielectric layer, second electrode layer) arranged in vertical stacking. This dimensional change allows capacitance enhancement through layer multiplication rather than单纯 column elongation, thereby improving capacitance while maintaining structural stability through the distributed layer configuration.
Solution Approach 2:
The capacitor is segmented into distinct functional layers: first electrode layer, dielectric layer, and second electrode layer. Each layer is formed separately with controlled thickness and material properties. This segmentation allows independent optimization of each layer's characteristics, enabling capacitance improvement through precise layer design while maintaining overall structural integrity and preventing toppling.
2Quantity of substance
If the columnar capacitor is elongated to increase charge storage, then the capacitance is improved, but the risk of electrical contact due to toppling increases
Solution Approach 1:
The patent employs a stacked columnar structure where charge storage is achieved through vertical layer stacking rather than horizontal column elongation. This dimensional approach increases charge storage capacity by multiplying the effective capacitor area across multiple layers while maintaining a compact vertical footprint, thereby preventing electrical contact issues associated with tall, unstable columns.
Solution Approach 2:
Different layers are assigned specific materials and thicknesses optimized for their functions: conductive materials for electrode layers and insulating materials for dielectric layers. This local quality differentiation ensures proper electrical isolation between layers, preventing unwanted electrical contact while maximizing charge storage capacity through optimized local material properties.
3Quantity of substance
If the surface area of the capacitor is enlarged to increase capacitance, then the charge storage is improved, but the structural stability deteriorates
Solution Approach 1:
The patent achieves surface area enlargement through vertical stacking of multiple capacitor layers rather than horizontal expansion. Each layer contributes to the total capacitance while the stacked configuration maintains a compact footprint, thereby increasing effective surface area for charge storage without compromising structural stability through excessive horizontal dimensions.
Solution Approach 2:
The stacked columnar capacitor utilizes composite material structures with different materials for electrode layers and dielectric layers. This composite approach allows optimization of each material's properties for its specific function, enabling high capacitance through material selection while maintaining structural stability through the composite layer configuration.
Data Source
AI summary
A semiconductor structure, a preparation method of the same, and a semiconductor device are provided. The semiconductor structure includes a substrate, including an active area. A first electrode layer is arranged on the substrate and electrically connected to the active area. The first electrode layer extends in a direction perpendicular to the substrate. A dielectric layer is arranged on a surface of the first electrode layer. A second electrode layer is arranged on a surface of the dielectric layer. Each of the surface of the first electrode layer and the surface of the dielectric layer are provided with an uneven structure.