Ground-Connected Supports With Insulating Spacers for Memory Capacitors
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Solution Overview
Problem
The challenge of maintaining sufficient capacitance in semiconductor devices with reduced design rules is hindered by the smaller footprint, as capacitance is a function of the surface area of the capacitor's electrode, and the increased height of the lower electrode leads to tilting or collapsing, necessitating a support structure to prevent this.
Innovation Solution
A semiconductor device with a conductive electrode support connected to a ground voltage, featuring a conductive electrode support between adjacent lower electrodes, a dielectric layer extending along the electrode profiles, and an upper electrode connected to the support, with insulating spacers maintaining electrical isolation and enhancing capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the height of the lower electrode is increased to increase capacitance, then the capacitance of the capacitor is improved, but the lower electrode tilts or collapses
Solution Approach 1:
An electrode support structure is introduced as an intermediary element between adjacent lower electrodes. This support structure provides mechanical stabilization to prevent tilting or collapsing of the increased-height lower electrodes, while the insulating spacer maintains electrical isolation. The support acts as a mediator that enables the lower electrode to achieve greater height for increased capacitance without sacrificing structural stability.
2Productivity
If the footprint of the semiconductor device is reduced for higher integration density, then the integration density is improved, but the capacitance decreases due to smaller electrode surface area
Solution Approach 1:
The solution transitions from a two-dimensional planar electrode structure to a three-dimensional structure by increasing the height of the lower electrode. This vertical dimensionality change allows the electrode to achieve greater capacitance (which depends on surface area) within a reduced footprint, thereby maintaining sufficient capacitance while enabling higher integration density.
Solution Approach 2:
The geometric parameters of the lower electrode are changed by increasing its height while reducing its planar footprint. This parameter transformation allows the capacitance (which is a function of surface area) to be maintained or improved through vertical extension rather than horizontal expansion, enabling higher integration density without sacrificing capacitance.
3Stability of the object's composition
If the conductive electrode support is added to prevent electrode collapse, then the structural stability is improved, but the device complexity increases
Solution Approach 1:
The electrode support structure is implemented as a thin film or layer formed between adjacent lower electrodes. This thin-film approach provides the necessary mechanical support and stability to prevent electrode collapse while minimizing the addition of material volume and structural complexity. The insulating spacer further simplifies the structure by providing electrical isolation in a thin layer configuration.
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 conductive electrode support structure improves the performance and reliability of the semiconductor device by preventing electrode collapse and increasing capacitance while reducing leakage current, thereby enhancing overall device functionality.
Implementation Method 1
insulating spacers maintaining electrical isolation
Implementation Method 2
increasing capacitance
Implementation Method 3
dielectric layer on the lower electrodes and the first electrode support
Data Source
AI summary
A semiconductor device may comprise: a plurality of lower electrodes which are on a substrate; a first electrode support which is between adjacent lower electrodes and comprises a metallic material; a dielectric layer which is on the lower electrodes and the first electrode support to extend along profiles of the first electrode support and each of the lower electrodes; and an upper electrode which is on the dielectric layer.