Rotatable Sidewall Heaters for Uniform Semiconductor Furnace Heating
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Solution Overview
Problem
Existing heater arrangements in vertical semiconductor furnaces are inadequate for maintaining uniform temperature across larger next-generation 450 mm wafers, leading to variances in material film thickness and deposition uniformity.
Innovation Solution
A semiconductor furnace with a heating system featuring rotatable sidewall heaters that can be adjusted in spacing and rotational speed, allowing for independent control of temperature zones along the reaction chamber to ensure uniform heating of vertically-stacked wafers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional fixed heater arrangements are used, then the heating system is simple and easy to manufacture, but temperature uniformity across large 450 mm wafers deteriorates
Solution Approach 1:
The heating system is divided into multiple independent heater zones (first heater, second heater, third heater) positioned at different vertical locations. Each heater can be independently controlled to create distinct temperature zones, enabling precise temperature uniformity across large wafer surfaces by addressing different radial regions separately
Solution Approach 2:
Each heater zone is designed to provide localized heating characteristics tailored to specific radial regions of the wafer. The heaters can be independently adjusted to compensate for local temperature variations across the wafer surface, ensuring uniform temperature distribution despite the large wafer size
2Manufacturing precision
If heater rotation capability is added, then temperature uniformity improves, but device complexity and manufacturing cost increase
Solution Approach 1:
The heater assemblies are made rotatable about the central axis of the reaction chamber, transforming the static heating system into a dynamic one. This rotation capability allows the heaters to move relative to the stationary wafer boat, enabling uniform heat distribution across the entire wafer surface through rotational motion, which improves film thickness uniformity
3Measurement precision
If multiple independently controllable heater zones are implemented, then temperature control precision improves, but system complexity increases
Solution Approach 1:
The reaction chamber is divided into multiple vertical heater zones (first, second, and third heaters) that can be independently controlled. This segmentation allows precise temperature control at different vertical positions, enabling accurate temperature profiles for uniform film deposition across the wafer stack
Solution Approach 2:
Each heater zone serves multiple functions: providing localized heating, creating temperature gradients for controlled deposition, and compensating for heat loss at different positions. This multi-functionality reduces the need for additional specialized components, managing system complexity while maintaining high temperature control precision
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 configuration promotes uniform film deposit thickness across each wafer and from wafer-to-wafer, enhancing temperature control and reducing variances in layer thicknesses, thereby meeting the requirements for larger wafer sizes.
Implementation Method 1
a heating system comprising a plurality of sidewall heaters spaced along the height of the reaction chamber which are arranged and operative to heat the chamber
Implementation Method 2
sidewall heaters spaced along the height of the reaction chamber which are arranged and operative to heat the chamber
Implementation Method 3
rotatable sidewall heaters that can be adjusted in spacing and rotational speed, allowing for independent control of temperature zones
Data Source
AI summary
A method for forming a layer of material on a semiconductor wafer using a semiconductor furnace that includes a thermal reaction chamber having a heating system having a plurality of rotatable heaters for providing a heating zone with uniform temperature profile is provided. The method minimizes temperature variations within the thermal reaction chamber and promotes uniform thickness of the film deposited on the wafers.