Composite Etch Stop Dielectric Layer for Selective Semiconductor Scaling
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Solution Overview
Problem
The semiconductor industry faces challenges in scaling down semiconductor devices while maintaining high performance and low costs, leading to increased complexity in processing and manufacturing due to the need for high storage capacity and fast processing systems.
Innovation Solution
The development of a composite dielectric layer formed through alternately stacking silicon-containing dielectric layers with varying compositions of Si, C, O, and N, achieved by tuning precursor materials, deposition cycles, and plasma treatments, which enhances mechanical and chemical properties such as Young's modulus and etching selectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If semiconductor devices are scaled down to increase packing density and storage capacity, then device integration and storage capacity are improved, but processing and manufacturing complexity increases
Solution Approach 1:
The patent employs composite dielectric layers combining silicon oxide and silicon nitride in a stacked configuration. This composite structure provides tailored mechanical and chemical properties that enable reliable processing of scaled-down devices, addressing the manufacturing complexity issue while supporting high-density integration
Solution Approach 2:
The dielectric structure is divided into multiple alternating layers of silicon oxide and silicon nitride. This segmentation allows each layer to contribute specific properties (etch selectivity, mechanical strength, stress control) that collectively simplify the overall manufacturing process for high-density device arrays
2Manufacturing precision
If composite dielectric layers with alternating silicon oxide and silicon nitride are formed, then etching selectivity and mechanical strength are improved, but device structure complexity increases
Solution Approach 1:
Different dielectric layers are assigned specific compositions and thicknesses to provide localized functions: silicon oxide layers provide etch stop functionality with high etching selectivity, while silicon nitride layers provide mechanical strength and stress control. This local optimization achieves high manufacturing precision without requiring complex overall structure design
Solution Approach 2:
The alternating composite structure of silicon oxide and silicon nitride layers creates a synergistic system where each material contributes its superior properties. The regular alternating pattern provides predictable etching behavior and mechanical properties while maintaining manageable structural complexity
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 composite dielectric layer improves mechanical strength and chemical selectivity, enabling better processing control and integration in semiconductor structures, thereby addressing the complexity and performance demands of scaled-down semiconductor devices.
Implementation Method 1
the dielectric layer is configured to prevent diffusion of silicon from the sacrificial semiconductor layer to the transistor channel
Data Source
AI summary
A device includes a first dielectric layer, a first conductor, an etch stop layer, a second dielectric layer, and a second conductor. The first conductor is in the first dielectric layer. The etch stop layer is over the first dielectric layer. The etch stop layer has a first surface facing the first dielectric layer and a second surface facing away from the first dielectric layer, and a concentration of carbon in the etch stop layer periodically varies from the first surface to the second surface. The second dielectric layer is over the etch stop layer. The second conductor is in the second dielectric layer and the etch stop layer and electrically connected to the first conductor.