Ion Beam Steering Component for Implant Angle Control
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Solution Overview
Problem
Ion implantation systems face challenges in precisely controlling the angle of the ion beam relative to the semiconductor wafer's crystalline lattice and mechanical surface, leading to issues like channeling and shadowing, especially as device sizes decrease and packing densities increase, resulting in inefficient doping and potential damage to the lattice structure.
Innovation Solution
Incorporating a steering component in the ion implantation system to direct the ion beam to a scan vertex, ensuring it coincides with the focal point of a parallelizing component, allowing for precise adjustment of the beam angle to optimize channeling and minimize shadowing effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the ion beam angle is not precisely controlled, then the ion implantation process is simpler to implement, but channeling and shadowing effects occur leading to inefficient doping and lattice damage
Solution Approach 1:
The patent replaces mechanical adjustment of beam angle with electromagnetic steering components (electrostatic or magnetic deflectors) that can precisely control beam direction through electric or magnetic fields, eliminating the need for complex mechanical goniometers while achieving superior angular precision
Solution Approach 2:
The patent controls beam angle by changing electromagnetic field parameters (voltage or current in steering components) rather than physical geometry, allowing dynamic and precise adjustment of beam orientation to optimize implantation conditions without mechanical complexity
2Productivity
If device sizes are reduced to increase packing density, then fabrication efficiency improves, but margins for error in ion beam orientation decrease leading to increased channeling and shadowing
Solution Approach 1:
Electromagnetic steering provides sub-milliradian beam angle control precision, enabling accurate implantation on scaled-down devices where traditional mechanical positioning would be insufficient due to tighter tolerances required by smaller feature sizes
Solution Approach 2:
The system incorporates feedback mechanisms (such as beam position monitors or dosimetry systems) that measure actual beam angle and provide correction signals to steering components, ensuring precise orientation control even as device dimensions shrink and tolerances tighten
3Manufacturing precision
If beam angle control mechanisms are added to prevent channeling and shadowing, then doping uniformity improves, but system complexity increases
Solution Approach 1:
Electromagnetic steering components integrate directly into the existing beamline without adding mechanical complexity, using field-based control to achieve precise beam angle management that prevents channeling and shadowing while maintaining system compactness
Solution Approach 2:
The electromagnetic steering components serve multiple functions: they control beam angle for uniform doping, enable rapid scanning across the wafer surface, and provide dynamic adjustment capabilities, consolidating multiple beam control functions into a single integrated system rather than adding separate mechanisms
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 solution enables more precise control over ion implantation, enhancing the depth and uniformity of doping, reducing energy loss and damage to the lattice, and improving the overall efficiency and yield of semiconductor fabrication by maintaining the desired orientation of the ion beam relative to the crystalline structure and mechanical surface.
Implementation Method 1
A steering component is included in an ion implantation system to direct or 'steer' an ion beam
Implementation Method 2
the scan vertex of the scanning component coincides with the focal point of a parallelizing component
Data Source
AI summary
A steering component is included in an ion implantation system to direct or “steer” an ion beam to a scan vertex of a scanning component downstream of the steering component. In this manner, the scan vertex of the scanning component coincides with the focal point of a parallelizing component downstream of the scanning component. This allows the beam to emerge from the parallelizing component at an expected angle so that ions can be implanted in a desired manner into a workpiece located downstream of the parallelizing component.