Semiconductor Device Dielectric Layering for Parasitic Capacitance Reduction
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Solution Overview
Problem
Current semiconductor devices are not fully satisfactory for meeting the increasing demand for volatile memory, particularly in dynamic random access memory applications, as they lack optimal performance in certain aspects.
Innovation Solution
A method for manufacturing a semiconductor device involving a semiconductor substrate with distinct regions, where an interconnection structure and a fuse structure are formed, along with specific layers such as a capping layer and an etching stop layer, to create openings that expose conductive pads and fuse structures through controlled etching processes, minimizing parasitic capacitance and ensuring precise patterning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-layer dielectric structure is used, then the manufacturing process is simpler, but parasitic capacitance increases and performance is insufficient
Solution Approach 1:
The dielectric structure is segmented into multiple layers: a first dielectric layer and a second dielectric layer with different dielectric constants. This segmentation allows the device to achieve both manufacturing feasibility and performance requirements by combining simpler processes with optimized electrical characteristics across layers.
Solution Approach 2:
The patent employs composite dielectric materials with different dielectric constants in different layers. The first dielectric layer and second dielectric layer are composed of different materials, creating a composite structure that reduces parasitic capacitance while maintaining manufacturability through established multi-layer fabrication techniques.
2Productivity
If conventional etching processes are used, then the manufacturing process is faster, but etching uniformity and surface quality deteriorate
Solution Approach 1:
Different etching conditions are applied to different regions: a first etching process with optimized parameters is used for the first dielectric layer, and a second etching process with different parameters is used for the second dielectric layer. This local optimization of etching conditions ensures both productivity and precision for each layer's specific requirements.
Solution Approach 2:
The etching process parameters are changed between layers: etching temperature, gas flow rates, and power settings are adjusted to match the specific material properties of each dielectric layer. This parameter optimization enables fast etching while maintaining uniform surface quality and precise patterning.
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 enhances the performance of semiconductor devices by reducing parasitic capacitance and improving the uniformity of the etched surfaces, addressing the limitations of existing technologies in volatile memory applications.
Implementation Method 1
performing a first etching process to remove the first dielectric layer, the etching stop layer and the capping layer so that a first opening is formed in the first region to expose the first conductive pad and a second opening is formed directly above the fuse structure
Implementation Method 2
During the first etching process, the first dielectric layer has a first etching rate, and the etching stop layer has a second etching rate that is lower than the first etching rate
Data Source
AI summary
A method for manufacturing a semiconductor device is provided. The method includes providing a substrate having a first region and a second region. The method also includes forming an interconnection structure on the first region and a fuse structure on the second region. The method further includes forming a first conductive pad on the interconnection structure. In addition, the method includes forming a capping layer, an etching stop layer and a dielectric layer to cover the first conductive pad and the fuse structure. The method further includes performing an etching process so that a first opening is formed to expose the conductive pad and a second opening is formed directly above the fuse structure. During the etching process, the first dielectric layer has a first etching rate, and the etching stop layer has a second etching rate that is lower than the first etching rate.