Air Gaps Between Word Lines in Memory Arrays
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Solution Overview
Problem
The existing memory devices face challenges in reducing latency and power consumption due to the high permittivity of dielectric materials between access lines, leading to increased capacitance and delayed access to memory cells.
Innovation Solution
The introduction of air gaps between adjacent word lines in a memory array reduces the permittivity of the areas between access lines, thereby decreasing the total capacitance and latency associated with accessing memory cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dielectric material is used between access lines, then insulation is provided, but permittivity is high leading to increased capacitance and latency
Solution Approach 1:
The patent extracts the dielectric material from between the access lines by forming voids (air gaps) in the dielectric layer. This removes the high permittivity material that causes capacitance and latency issues, while still maintaining the structural framework for insulation where needed.
Solution Approach 2:
The patent introduces a porous structure by creating voids filled with air (or other low-permittivity gas) within the dielectric layer. This porous configuration reduces the effective permittivity between access lines, thereby decreasing capacitance and latency while preserving insulation properties.
2Strength
If dielectric material is used between access lines, then structural support is provided, but capacitance increases leading to higher power consumption
Solution Approach 1:
The patent removes dielectric material from specific regions between access lines to create air gaps. This extraction reduces the capacitance and associated power consumption while the remaining dielectric structure and air gap configuration continue to provide necessary structural support.
Solution Approach 2:
The patent creates a composite structure combining dielectric material and air (gas) phases. This composite configuration optimizes both structural support and electrical properties by strategically placing low-permittivity air gaps where they reduce capacitance while maintaining overall structural integrity.
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 implementation of air gaps in the memory array effectively reduces latency and power consumption during access operations, enhancing the overall performance of memory devices.
Implementation Method 1
The introduction of air gaps between adjacent word lines in a memory array reduces the permittivity of the areas between access lines, thereby decreasing the total capacitance
Data Source
AI summary
Techniques for electronic memory are described. A method for forming a memory array may include forming memory cells, a dielectric material between word lines, and a sealing material on sidewalls of the dielectric material. The method may also include removing at least a portion of the sealing material to expose the dielectric material. Also, the method may include forming one or more voids in the dielectric material, where the one or more voids may separate the word lines from one another. The memory array may include the memory cells, the word lines, pillars, and piers, where the word lines may be separated from one another by the one or more voids to form air gaps.