PECVD Showerhead Temperature Control via Fluid Conduits
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Inadequate temperature control in plasma enhanced chemical vapor deposition (PECVD) chambers affects deposition efficiency, gas flow distribution, film profile uniformity, and chamber cleanliness, particularly during low-temperature processes like thin film encapsulation.
Innovation Solution
A temperature-controlled diffuser in the PECVD chamber, where a fluid is circulated through channels or a conduit to heat or cool the gas distribution showerhead, maintaining a desired temperature range during deposition and cleaning processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a low temperature is used during thin film encapsulation process, then the substrate can be processed without damage, but the cleaning rate is negatively affected
Solution Approach 1:
The gas distribution showerhead is segmented into multiple independent heating zones with separate temperature control, allowing different regions to operate at different temperatures optimized for their specific functions (deposition vs. cleaning)
Solution Approach 2:
Different regions of the gas distribution showerhead are provided with different thermal conditions through independent temperature control, with the cleaning zone maintained at higher temperature to improve cleaning rate while the substrate zone remains at lower temperature for safe processing
2Device complexity
If the temperature of the gas distribution showerhead is not controlled, then the device structure remains simple, but deposition efficiency and film profile uniformity are adversely affected
Solution Approach 1:
A thermal field is introduced as an intermediary between the gas distribution showerhead and the environment, using heated or cooled gases to control the thermal environment and improve deposition uniformity without requiring direct contact heating elements
Solution Approach 2:
The temperature control is achieved through pneumatic means by circulating heated or cooled process gases through the gas distribution showerhead, avoiding complex mechanical heating elements and maintaining structural simplicity
3Device complexity
If the temperature of the gas distribution showerhead is not controlled, then the device structure remains simple, but gas flow distribution is adversely affected
Solution Approach 1:
The temperature parameter of the gas distribution showerhead is actively controlled by adjusting the temperature of circulating process gases, allowing optimization of gas flow distribution and deposition characteristics without changing the structural design
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 solution enhances temperature control, improving the efficiency of both deposition and cleaning processes by maintaining optimal conditions, thus ensuring better film uniformity and chamber cleanliness across varying temperature regimes.
Implementation Method 1
The diffuser (e.g., a gas distribution showerhead) is heated or cooled (e.g., temperature controlled) by circulating a fluid at a predetermined temperature range either through channels formed within the diffuser or a tube coupled to the diffuser
Implementation Method 2
The precursor gas in the vacuum chamber is excited into a plasma by applying an RF power to a chamber electrode from one or more RF sources coupled to the chamber. The plasma forms a layer of material on a surface of a substrate
Data Source
AI summary
A PECVD chamber is disclosed with a temperature controlled gas distribution showerhead. The gas distribution showerhead is temperature controlled heated by circulating a g fluid through conduit formed within or coupled to the gas distribution showerhead. The PECVD chamber comprises a gas distribution showerhead, a backing plate coupled to the gas distribution showerhead, the backing plate having a bottom surface facing and substantially parallel with and spaced from an upper surface of the gas distribution showerhead; and a temperature controlling device coupled to the gas distribution showerhead and disposed between the backing plate and the gas distribution showerhead.