Charge Trapping Dielectric Layer for DRAM Word Line Interference
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Solution Overview
Problem
As DRAM devices are scaled down, adjacent word lines in DRAM arrays increasingly interfere with each other's functionality due to closer proximity, leading to reduced performance and increased manufacturing costs.
Innovation Solution
The semiconductor device incorporates a substrate with a first word line and source/drain doping regions, featuring a gate trench, gate electrode, gate dielectric layer, and charge trapping dielectric layers made of materials like HfO2, TiO2, ZrO2, germanium nanocrystals, or organic materials, which reduce interference between adjacent word lines and transistors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If DRAM devices are scaled down to decrease manufacturing costs and increase speed, then manufacturing cost and operation speed are improved, but adjacent word lines get closer and interfere with each other's functionality
Solution Approach 1:
A charge trapping dielectric layer is introduced as an intermediary between adjacent word lines. This layer captures and holds charges that would otherwise cause interference between neighboring word lines, thereby eliminating the harmful coupling effect while allowing the word lines to remain in close proximity for scaled-down device dimensions.
Solution Approach 2:
The electrical properties of the dielectric layer are specifically engineered to have charge trapping capability with particular trap energy levels and densities. By adjusting the trapping parameters (trap depth, trap density, breakdown voltage) of the dielectric layer, the interference between adjacent word lines is controlled and minimized while maintaining device scalability.
2Speed
If device size is reduced to increase speed, then operation speed is improved, but adjacent transistors interfere with each other
Solution Approach 1:
The charge trapping dielectric layer serves as a mediator between adjacent transistors, capturing stray charges that would cause cross-talk and interference. This allows transistors to be placed closer together for higher speed operation without suffering from adjacent transistor interference.
Solution Approach 2:
The charge trapping characteristics of the dielectric layer are optimized with specific trap energy levels and densities that are tailored to suppress transistor interference while maintaining fast switching speeds. The electrical parameters of the trapping layer are adjusted to match the operating conditions of the scaled-down transistors.
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
This configuration effectively minimizes the influence of adjacent word lines and transistors, enhancing the stability and performance of DRAM devices while maintaining manufacturing efficiency.
Implementation Method 1
at least one first charge trapping dielectric layer disposed adjacent to the gate electrode, wherein the first charge trapping dielectric layer comprises HfO2, TiO2 or ZrO2
Data Source
AI summary
A semiconductor device capable of reducing influences of adjacent word lines is provided in the present invention. The semiconductor device includes: a substrate, and a word line disposed in the substrate. The word line includes: a gate electrode, a gate dielectric layer disposed between the gate electrode and the substrate and at least one first charge trapping dielectric layer disposed adjacent to the gate electrode, wherein the first charge trapping dielectric layer comprises HfO2, TiO2, ZrO2, a germanium nanocrystal layer, an organic charge trapping material, HfSiOxNy, or MoSiOqNz.