Superlattice Pattern Blocks Dopant Diffusion in Semiconductor Devices
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Solution Overview
Problem
Existing semiconductor devices face challenges in maintaining high reliability due to dopant diffusion issues, which can lead to reduced performance and increased manufacturing costs as devices become more complex and highly integrated.
Innovation Solution
The implementation of a superlattice pattern in semiconductor devices, comprising alternately stacked semiconductor layers and blocker-containing layers with blockers such as oxygen, carbon, fluorine, and nitrogen, which prevents dopant diffusion and enhances device reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If semiconductor devices are highly integrated to meet performance demands, then device functionality and speed are improved, but dopant diffusion increases and reliability deteriorates
Solution Approach 1:
A superlattice pattern is introduced as an intermediary structure between the well region and source/drain pattern. This superlattice acts as a mediator that blocks dopant diffusion while allowing controlled electrical interaction, thus maintaining high-speed device performance while preventing harmful dopant migration that would compromise reliability
Solution Approach 2:
The superlattice pattern employs composite material structure with alternating semiconductor layers and blocker-containing layers. This composite structure combines the electrical properties needed for high-speed operation with the physical barrier properties to prevent dopant diffusion, resolving the contradiction between speed and reliability
2Adaptability or versatility
If device structures become more complicated to achieve high integration, then functionality is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The superlattice pattern segments the interface region between well and source/drain into multiple thin alternating layers. This segmentation approach simplifies the overall manufacturing process by using standard epitaxial growth techniques to create the blocked diffusion layer, avoiding the need for complex additional processing steps while achieving the desired functionality
3Reliability
If dopant diffusion is allowed to improve electrical connection, then conductivity is improved, but device reliability decreases due to unwanted dopant migration
Solution Approach 1:
The superlattice pattern converts the potentially harmful effect of dopant diffusion into a beneficial feature by strategically placing blocker-containing layers that selectively block dopant migration. The alternating semiconductor and blocker layers create a structure where electrical conductivity is maintained where needed while dopant diffusion is prevented in critical regions, turning the diffusion problem into a controlled advantage
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 superlattice pattern effectively impedes dopant migration between well regions and source/drain patterns, thereby improving the overall reliability and performance of semiconductor devices while simplifying the manufacturing process.
Implementation Method 1
The first superlattice pattern includes at least one first semiconductor layer and at least one first blocker-containing layer, and the first blocker-containing layer includes at least one of oxygen, carbon, fluorine and nitrogen
Data Source
AI summary
A semiconductor device includes; a substrate including a first region and a second region, a first active pattern extending upward from the first region, a first superlattice pattern on the first active pattern, a first active fin centrally disposed on the first active pattern, a first gate electrode disposed on the first active fin, and first source/drain patterns disposed on opposing sides of the first active fin and on the first active pattern. The first superlattice pattern includes at least one first semiconductor layer and at least one first blocker-containing layer, and the first blocker-containing layer includes at least one of oxygen, carbon, fluorine and nitrogen.