Impurity Beam Separation for Multi-Depth Wafer Doping
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
As semiconductor devices are downscaled, precise control of impurity diffusion layers is required to minimize crystal defects and reduce leak current, which is challenging due to the need for repeated ion implantation processes under different conditions, leading to decreased throughput.
Innovation Solution
A semiconductor manufacturing apparatus that separates impurity beams into ion and neutral components using an energy filter, allowing for controlled implantation of these components at different depths on a semiconductor wafer, enabling the formation of multiple impurity layers with varying concentrations in a single process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single impurity diffusion layer is used to form source or drain layers, then the manufacturing process is simplified, but crystal defects increase and leak current increases
Solution Approach 1:
The patent divides a single impurity diffusion layer into multiple impurity diffusion layers with different impurity concentrations. By forming a first impurity diffusion layer with a first concentration profile and a second impurity diffusion layer with a second concentration profile, the structure segments the doping process to reduce crystal defects and prevent leak current while maintaining manufacturing feasibility through automated sequential formation.
Solution Approach 2:
The patent applies local quality by creating regions with different impurity concentrations within the same source or drain layer. The first and second impurity diffusion layers have distinct concentration profiles tailored to specific depth ranges, optimizing electrical characteristics locally to prevent leak current at interfaces while maintaining overall device performance.
2Reliability
If multiple ion implantation processes are repeated to form multiple impurity diffusion layers, then crystal defects are reduced and leak current is prevented, but throughput decreases
Solution Approach 1:
The patent merges multiple ion implantation processes into a single integrated process by forming multiple impurity diffusion layers sequentially in one manufacturing step. The apparatus performs automated switching between different ion implantation conditions without requiring separate process chambers or wafer re-loading, combining what would traditionally be multiple discrete steps into one continuous operation that maintains high throughput.
Solution Approach 2:
The patent ensures continuity of useful action by maintaining the ion implantation process without interruption. The manufacturing apparatus automatically adjusts implantation conditions and continues forming different impurity diffusion layers in sequence within the same process cycle, eliminating idle time between steps and maintaining continuous productive action throughout the multi-layer formation process.
3Manufacturing precision
If multiple ion implantation processes are used to form multiple impurity diffusion layers, then precise impurity concentration control is achieved, but the manufacturing complexity increases
Solution Approach 1:
The patent achieves precise impurity concentration control by systematically changing implantation parameters such as ion dose, energy, and angle between sequential layers. The manufacturing apparatus automatically adjusts these parameters for each impurity diffusion layer formation step, enabling precise concentration profiles without requiring complex manual intervention or additional process equipment.
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 reduces crystal defects, improves throughput, and prevents leak current by forming impurity layers with precise concentration profiles at different depths, enhancing the manufacturing efficiency and reducing production costs.
Implementation Method 1
an ion component introducing unit that introduces the ion component into the wafer; a neutral component introducing unit that introduces the neutral component into the wafer
Data Source
AI summary
A semiconductor manufacturing apparatus according to the present embodiment includes a stage on which a wafer can be placed. A separator separates a beam of impurities to be introduced into the wafer into an ion component and a neutral component. A controller switches the semiconductor manufacturing apparatus between a first mode and a second mode, where in the first mode, the ion component is introduced into the wafer and in the second mode, the neutral component is introduced into the wafer.