Heater Assembly Cooling via Insulation Channels
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Solution Overview
Problem
Conventional furnace heating elements in semiconductor manufacturing have slow cool-down rates, which limit processing throughput and require complex, expensive modifications for faster cooling, often resulting in non-uniform temperature gradients and reduced precision.
Innovation Solution
Incorporating channels within or between the insulation layers of the heater assembly for fluidic flow, either natural convection or forced air/liquid flow, to enhance cooling rates without compromising the uniformity of the temperature profile, using adjustable flow conductance and control systems to optimize heating and cooling rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If heating insulation is used to cover the heating elements, then heating temperature and ramp up rate are improved, but ramp down rate deteriorates
Solution Approach 1:
The heating assembly is segmented into multiple heating zones with independent control, allowing different parts of the furnace to be heated or cooled at different rates. This enables the heating elements to maintain high temperature when needed while allowing selective cooling of specific zones to improve overall ramp down rate.
Solution Approach 2:
A fluid distribution system acts as an intermediary between the heating elements and the external environment, enabling controlled heat removal. The fluid channels distributed within the insulation layer serve as a mediator to extract heat from the heating elements during cooling phases without directly contacting the process chamber.
2Loss of energy
If heating insulation is used to cover the heating elements, then heat loss is minimized, but processing throughput deteriorates
Solution Approach 1:
The insulation system transitions from a static heat barrier to a dynamic thermal management system. The fluid distribution system allows the insulation to actively adjust its thermal conductivity by controlling fluid flow, enabling rapid cooling between processing cycles to improve throughput while maintaining heat retention during processing.
Solution Approach 2:
The thermal properties of the insulation system are made variable through controlled fluid flow. By changing the flow rate and temperature of the cooling fluid, the effective thermal conductivity of the insulation layer can be dynamically adjusted to optimize both heat retention and cooling rate for different operational requirements.
3Speed
If complex modifications are made to achieve faster cooling, then cooling rate is improved, but device complexity and cost increase
Solution Approach 1:
The fluid distribution system serves multiple functions: it cools the heating elements during ramp down, preheats the incoming air during ramp up, and can maintain temperature during processing. This multi-functionality achieves fast cooling without requiring separate dedicated cooling systems, reducing overall complexity.
Solution Approach 2:
The system uses the existing insulation structure and ambient air as part of the cooling mechanism. The fluid distribution system leverages the thermal mass of the insulation layer and the temperature difference with ambient air to achieve passive cooling assistance, reducing the need for active cooling components.
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 allows for faster ramp-up and ramp-down rates, improving temperature precision and reducing cycle times while maintaining a uniform temperature profile, thus enhancing processing throughput and efficiency without the need for costly modifications.
Implementation Method 1
Incorporating channels within or between the insulation layers of the heater assembly for fluidic flow, either natural convection or forced air/liquid flow, to enhance cooling rates
Implementation Method 2
Incorporating channels within or between the insulation layers of the heater assembly for fluidic flow, either natural convection or forced air/liquid flow, to enhance cooling rates
Implementation Method 3
Heating insulation can be used to cover the heating elements, insulating the high temperature furnace processing chamber from the room temperature outside ambient. The heating insulation can minimize heat loss
Implementation Method 4
Heating elements can be provided on the outside the quartz tube
Data Source
AI summary
A heater assembly with enhanced cooling pursuant to various embodiments described herein makes use of fluidic flow in the insulation or in the space used for insulation. By creating a natural convection or forced convection flow, the heater cools down faster, it can operate at lower temperatures and/or higher temperature precision, and it can improve temperature controllability by generating higher heat loss rates.