Semiconductor Device Diffusion Barrier Layer
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Solution Overview
Problem
The diffusion of high-concentration dopants from the floating gate into the tunnel insulating layer during the deposition and heat treatment processes in semiconductor devices leads to reduced layer quality and performance degradation in non-volatile memory devices.
Innovation Solution
Incorporating a diffusion barrier layer made of carbon, nitrogen, or oxygen between the tunnel insulating layer and the charge storage layer to block the diffusion path of dopants, thereby maintaining the integrity of the tunnel insulating layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a high-concentration dopant is used in the floating gate to improve charge storage capability, then the memory device can store data more effectively, but the dopant diffuses into the tunnel insulating layer during deposition and heat treatment processes, reducing layer quality
Solution Approach 1:
A diffusion barrier layer is introduced as an intermediary between the charge storage layer and the tunnel insulating layer. This barrier layer, composed of materials such as silicon oxide, silicon nitride, or silicon oxynitride, prevents dopant atoms from migrating into the tunnel insulating layer while allowing the charge storage layer to maintain its high dopant concentration for effective data storage
2Ease of manufacture
If the deposition and heat treatment processes are performed to form the charge storage layer with high dopant concentration, then the memory device functionality is achieved, but dopant diffusion occurs causing features of the memory device to deteriorate
Solution Approach 1:
The diffusion barrier layer is formed in advance before the charge storage layer deposition and heat treatment processes. This preliminary structure prevents dopant diffusion during subsequent manufacturing steps, ensuring that the tunnel insulating layer maintains its quality and the memory device features are preserved throughout the fabrication process
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 solution effectively prevents dopant diffusion, enhancing the layer quality and performance of semiconductor devices by reducing the grain size of the silicon layer and controlling the crystal growth rate, thus maintaining the features of the memory device.
Implementation Method 1
a diffusion barrier layer interposed between the tunnel insulating layer and the charge storage layer, the diffusion barrier layer including at least one of carbon, nitrogen, or oxygen
Data Source
AI summary
A semiconductor device and a method for forming the same. The semiconductor device includes a tunnel insulating layer, a charge storage layer including a dopant, and a diffusion barrier layer including at least one of carbon, nitrogen, or oxygen interposed between the tunnel insulating layer and the charge storage layer.