Temperature-Controlled Showerhead Assembly for Uniform Cyclic Deposition
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Solution Overview
Problem
In semiconductor manufacturing, cyclic vapor deposition systems face challenges in achieving uniform thin film deposition due to insufficient gas mixing and diffusion, thermal self-decomposition of precursors, and non-uniform substrate temperature, leading to issues like thickness and resistivity variations in thin films.
Innovation Solution
A temperature-controlled showerhead assembly with a gas diffusing/mixing cavity and a network of heating and cooling channels, along with a thermally insulating film, is designed to maintain a consistent temperature and enhance gas mixing, ensuring uniform precursor distribution and improved thin film characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional showerhead design is used, then the device complexity is low, but the gas mixing and diffusion is insufficient leading to non-uniform thin film deposition
Solution Approach 1:
The showerhead is divided into multiple functional zones including a gas distribution region with multiple gas inlets, a mixing region with baffle structures, and a deposition region. This segmentation allows each zone to perform its specific function optimally, improving gas mixing and thin film uniformity while managing complexity through functional modularity.
Solution Approach 2:
A thermally insulating film is introduced as an intermediary layer between the heating/cooling channels and the showerhead body. This intermediary prevents direct thermal interference, allowing independent temperature control of different regions and improving overall temperature uniformity without requiring complete thermal isolation.
2Temperature
If heating elements are added to control temperature, then the temperature control capability is improved, but the device complexity increases
Solution Approach 1:
Heating elements and cooling channels are selectively positioned at different locations within the showerhead body based on local thermal requirements. The heating elements are placed in regions requiring temperature maintenance, while cooling channels are positioned in regions prone to overheating, achieving local thermal optimization without uniformly complexifying the entire structure.
Solution Approach 2:
The heating elements and cooling channels are nested within the showerhead body in a compact arrangement. The thermal insulation film is nested between these active thermal control components and the external environment, creating a layered nested structure that maximizes thermal control efficiency while minimizing overall device volume and complexity.
3Stability of the object's composition
If cooling channels are added to maintain temperature, then the thermal stability is improved, but the gas flow path complexity increases
Solution Approach 1:
The cooling channels are designed with asymmetric cross-sectional shapes and non-uniform distributions within the showerhead body, optimized to match the asymmetric thermal load patterns. This asymmetric design allows efficient heat removal with fewer and simpler channels compared to symmetric uniform distributions, reducing overall channel network complexity.
Solution Approach 2:
The cooling channel network is designed to create equipotential thermal zones throughout the showerhead body, ensuring uniform temperature distribution. By strategically positioning channels to balance thermal gradients, the system achieves thermal stability without requiring excessive channel density or complex routing patterns.
4Manufacturing precision
If the showerhead body thickness is increased for better thermal control, then the temperature control precision is improved, but the gas diffusion distance increases reducing deposition efficiency
Solution Approach 1:
Instead of increasing showerhead body thickness in the vertical dimension, the thermal control functionality is implemented by adding heating elements and cooling channels in the lateral dimensions. This dimensional transition allows effective thermal control without increasing the vertical distance for gas diffusion, maintaining deposition efficiency while achieving 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
The solution improves the uniformity and quality of thin films by maintaining a consistent temperature profile and enhancing gas mixing, resulting in better thickness, composition, and resistivity uniformity, as well as improved step coverage in high aspect ratio structures.
Implementation Method 1
a network of cooling channels configured to transfer heat away from the showerhead body
Implementation Method 2
a network of heating elements configured to supply heat to the showerhead body
Implementation Method 3
a thermally insulating film vertically interposed between the cooling channels and the network of heating elements
Implementation Method 4
the cavity is configured to diffuse or mix the gases prior to introducing the gases into the deposition chamber
Data Source
AI summary
A temperature-controlled showerhead assembly is configured to deliver a plurality of gases into a cyclic deposition chamber. The showerhead assembly comprises a showerhead body having a cavity formed therethrough and at a central region thereof, wherein the cavity is configured to diffuse or mix the gases prior to introducing the gases into the deposition chamber. The showerhead assembly additionally comprises a network of cooling channels configured to conduct heat away from the showerhead body. The showerhead assembly further comprises a network of heating elements configured to supply heat to the showerhead body, wherein the network of heating elements is disposed closer to the an upper surface of the showerhead body relative to the cooling channels.