Movable Laser Heating for Uniform Wafer Deposition Temperature
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Solution Overview
Problem
Existing deposition instruments struggle to achieve precise temperature control and uniform heating on semiconductor wafers, leading to non-uniform epitaxial feature formation and defects such as roll-off profiles, which affect device performance.
Innovation Solution
A semiconductor processing apparatus with movable heating sources, including laser heating elements, is employed to provide localized and uniform heating by compensating for wobbling and leveling issues, ensuring consistent heating across the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional heating methods are used in deposition instruments, then the device complexity is reduced, but the temperature control precision and heating uniformity deteriorate
Solution Approach 1:
The heating system is segmented into multiple independent laser heating elements that can be individually controlled. Each laser element targets specific regions of the substrate, allowing precise local temperature control. This segmentation enables high temperature precision without requiring a completely complex monolithic heating system.
Solution Approach 2:
The patent implements local quality by providing different heating conditions to different regions of the substrate. Movable laser heating elements can be positioned to deliver concentrated heating to specific areas requiring higher temperature control precision, while other regions receive appropriate heating levels, achieving overall uniformity with localized precision.
2Stability of the object's composition
If conventional heating methods are used, then the device structure is simpler, but the heating uniformity across the substrate deteriorates
Solution Approach 1:
The patent employs movable laser heating elements that can dynamically reposition themselves across the substrate surface. This dynamic capability allows the system to adapt to different substrate positions and compensate for wobbling or leveling variations, achieving uniform heating distribution through active movement rather than static complex structures.
Solution Approach 2:
The system incorporates feedback mechanisms that monitor temperature distribution and substrate position in real-time. Based on this feedback, the movable laser heating elements adjust their positions and heating intensities to compensate for variations, maintaining heating uniformity through continuous correction rather than relying solely on complex mechanical precision.
3Reliability
If fixed heating elements are used, then the device complexity is lower, but the ability to compensate for wobbling and leveling variations is reduced
Solution Approach 1:
The movable laser heating elements provide dynamic adaptation to substrate position variations. When wobbling or leveling issues occur, the lasers can reposition themselves to maintain optimal heating coverage, enhancing reliability without requiring complex mechanical compensation structures.
Solution Approach 2:
The system changes operational parameters (laser position, heating intensity) in response to detected substrate variations. This parameter adjustment capability allows the system to compensate for wobbling and leveling effects through software-controlled modifications rather than complex mechanical adjustments.
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 enhances heating precision and uniformity, improving the fabrication of epitaxial features and reducing defects, thereby enhancing semiconductor device performance.
Implementation Method 1
a second heating element moveable relative to the base station and operable to direct heat to a portion of the semiconductor substrate
Implementation Method 2
an epitaxial layer may be formed on a semiconductor wafer by a chemical vapor deposition process using a mixture of semiconductor source gases
Data Source
AI summary
The present disclosure provides a semiconductor processing apparatus according to one embodiment. The semiconductor processing apparatus includes a chamber; a base station located in the chamber for supporting a semiconductor substrate; a preheating assembly surrounding the base station; a first heating element fixed relative to the base station and configured to direct heat to the semiconductor substrate; and a second heating element moveable relative to the base station and operable to direct heat to a portion of the semiconductor substrate.