Dielectric Layer Carbon Gradient for Capacitance
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Solution Overview
Problem
In semiconductor devices, achieving adequate capacitance in dielectric layers for effective functioning as gate or capacitor insulating layers is challenging due to the inverse proportionality of capacitance to layer thickness and the need for controlled carbon concentration.
Innovation Solution
A method involving the formation of multiple dielectric layers with varying carbon concentrations using metal oxide and silicon oxynitride layers, where the first dielectric layer has a lower carbon concentration adjacent to the substrate and the second layer has a higher concentration, achieved through atomic layer deposition techniques with specific metal and oxidation gas injections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the dielectric layer thickness is reduced to increase capacitance, then the capacitance increases, but the manufacturing precision and reliability deteriorate due to difficulty in controlling thin layer formation and carbon concentration distribution
Solution Approach 1:
The dielectric layer is divided into multiple sub-layers with different carbon concentrations. The first dielectric layer has a first carbon concentration and the second dielectric layer has a second carbon concentration higher than the first. This segmentation allows each layer to be optimized independently for thickness and composition, improving manufacturing precision while achieving the required overall capacitance.
Solution Approach 2:
Different regions of the dielectric structure are assigned different carbon concentrations to optimize local properties. The first dielectric layer adjacent to the substrate has lower carbon concentration for better interface quality and thinner effective thickness, while the second dielectric layer has higher carbon concentration for sufficient capacitance contribution, resolving the contradiction between thinness and manufacturability.
2Reliability
If the carbon concentration is increased to improve dielectric properties, then the capacitance increases, but the manufacturing complexity increases due to need for precise concentration control
Solution Approach 1:
The carbon concentration profile is segmented into distinct regions rather than requiring continuous precise control. The first dielectric layer uses a first carbon concentration and the second dielectric layer uses a second carbon concentration, simplifying manufacturing by using discrete concentration levels instead of continuous control.
Solution Approach 2:
The carbon concentration parameter is changed in discrete steps between layers rather than requiring continuous adjustment. This parameter change approach simplifies the manufacturing process while still achieving optimized dielectric properties through the gradient structure.
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 approach allows for the optimization of carbon concentration gradients in dielectric layers, enhancing capacitance and improving the performance of semiconductor devices by controlling the thickness and carbon distribution within the layers.
Implementation Method 1
achieved through atomic layer deposition techniques with specific metal and oxidation gas injections
Data Source
AI summary
Semiconductor devices and methods of forming the semiconductor device are provided, the semiconductor devices including a first dielectric layer on a substrate, and a second dielectric layer on the first dielectric layer. The first dielectric layer has a carbon concentration lower than the second dielectric layer.