Epitaxial Semiconductor Structure for Fine-Pattern Doping Control
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Solution Overview
Problem
The increasing demand for high-performance, high-speed, and multifunctional semiconductor devices requires improved integration and electrical characteristics, particularly in FinFETs with three-dimensional channel structures, where existing technologies face challenges in achieving fine patterns and optimal doping profiles.
Innovation Solution
A semiconductor device is designed with a semiconductor layer, epitaxial layer, and active structures incorporating different conductivity-type impurities, along with dummy gate structures and source layers, to enhance integration and electrical performance by controlling doping profiles and reducing feature sizes through epitaxial growth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the degree of integration is increased to meet high-performance demands, then device functionality and speed improve, but manufacturing precision and pattern formation become more difficult
Solution Approach 1:
The semiconductor device is divided into multiple semiconductor regions (first, second, third regions) with different conductivity types and structures. This segmentation allows each region to be optimized independently for its specific function while maintaining high overall integration, resolving the conflict between integration density and manufacturing precision by enabling modular fabrication approaches.
Solution Approach 2:
Different semiconductor regions are doped with different conductivity-type impurities (first and second conductivity types) to create locally optimized electrical characteristics. The epitaxial layer is selectively formed in specific regions with different doping profiles, allowing precise local control of electrical properties without compromising overall device integration and manufacturing feasibility.
2Length of moving object
If feature sizes are reduced to achieve fine patterns, then device integration increases, but doping profile control becomes more challenging
Solution Approach 1:
The epitaxial layer is formed in advance during the manufacturing process, incorporating second conductivity-type impurities before subsequent processing steps. This preliminary formation of the epitaxial layer with controlled doping profiles enables precise impurity distribution even in reduced feature sizes, as the doping is established during the epitaxial growth phase rather than through later diffusion or implantation steps that are harder to control at smaller dimensions.
3Reliability
If epitaxial layers with different conductivity types are integrated, then electrical characteristics improve, but device structure complexity increases
Solution Approach 1:
Multiple semiconductor regions with different conductivity types (first and second conductivity-type impurities) are merged into a single integrated device structure. The epitaxial layer is combined with the semiconductor layer to form a unified structure that achieves complex electrical characteristics through the synergistic interaction of different doped regions, rather than requiring separate discrete components.
Solution Approach 2:
The device employs composite semiconductor structures where epitaxial layers with second conductivity-type impurities are integrated with semiconductor layers containing first conductivity-type impurities. This creates a composite material system with tailored electrical properties, combining different doped semiconductor regions to achieve superior electrical characteristics while maintaining a unified device architecture.
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 solution achieves improved integration and electrical characteristics by precisely controlling doping profiles and reducing feature sizes, leading to enhanced performance in semiconductor devices like bipolar junction transistors.
Implementation Method 1
an epitaxial layer in the semiconductor layer, wherein the epitaxial layer includes second conductivity-type impurities
Data Source
AI summary
A semiconductor device includes a semiconductor layer including first conductivity-type impurities; first active structures extending upwardly from the semiconductor layer and including the first conductivity-type impurities; an epitaxial layer in the semiconductor layer and including second conductivity-type impurities; second active structures extending upwardly from the epitaxial layer, between the first active structures in a first direction, and including the second conductivity-type impurities; third active structures extending upwardly from the epitaxial layer, between the second active structures in the first direction, and including the first conductivity-type impurities; and dummy gate structures intersecting the first and second active structures on the semiconductor layer, respectively, and extending in a second direction.