Quartz CVD Chamber Rib Layout With Adjustable Heater Calibration
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Solution Overview
Problem
Semiconductor processing apparatuses face challenges in maintaining temperature uniformity and thermal calibration due to variations in reaction chamber design and refurbishment processes, leading to non-uniform deposition and reduced yield in chemical vapor deposition processes.
Innovation Solution
A semiconductor processing apparatus with a quartz reaction chamber featuring transversely oriented ribs and adjustable heating elements, allowing for precise positioning of heating elements relative to the ribs to ensure uniform thermal environment and calibration across multiple tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If gussets or ribs are provided on the exterior of the chamber walls to handle inwardly directed forces at reduced pressure, then the chamber structural strength is improved, but the lamp energy reaching certain sections of the substrate is attenuated causing cooler regions
Solution Approach 1:
The heating element array is made adjustable and repositionable relative to the reaction chamber, allowing dynamic optimization of the heating element position to compensate for the shadowing effect caused by the ribs, thereby maintaining temperature uniformity while preserving the structural strength provided by the ribs
Solution Approach 2:
The heating element array can be repositioned to provide localized heating compensation in specific regions shadowed by the ribs, allowing different parts of the substrate to receive appropriate heating to maintain overall temperature uniformity
2Productivity
If the reaction chamber is refurbished to extend its use, then the productivity is improved, but the thermal characteristics and temperature uniformity may be degraded due to variations in refurbishment processes
Solution Approach 1:
The adjustable heating element array allows for re-calibration of the thermal environment after chamber refurbishment, compensating for variations introduced during refurbishment processes and restoring temperature uniformity without requiring replacement of the entire chamber
Solution Approach 2:
The position and configuration of the heating element array can be modified to adapt to changes in the chamber's thermal characteristics after refurbishment, allowing the system to maintain optimal thermal performance despite variations in the chamber structure
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 temperature uniformity across substrates, enabling consistent deposition results and extending the use of refurbished quartz reaction chambers without degradation in thermal characteristics, thus enhancing the efficiency and reliability of semiconductor processing.
Implementation Method 1
Both the substrate and the support may be heated to a desired set point temperature... radiant lamp heaters... quartz is substantially transparent to the radiant lamp energy
Implementation Method 2
reactant gases may be passed over a heated substrate, causing the chemical vapor deposition (CVD) of a thin layer of the reactant material onto the substrate
Data Source
AI summary
A semiconductor processing apparatus is disclosed that may include a reaction chamber joined by an upstream inlet flange and a downstream outlet flange wherein a longitudinal direction of the chamber extends from the inlet flange to the outlet flange and a plurality of ribs are provided on an outer surface of at least an upper chamber wall. The semiconductor processing apparatus may also include at least one array of heating elements disposed above the reaction chamber and at least one variable positioning device coupled to the at least one array of heating elements and configured to controllably adjust the position of the at least one array of heating elements relative to the position of the plurality of ribs.