Showerhead Co-Deposition Control for Organic Film Morphology
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Solution Overview
Problem
Conventional vapor deposition processes struggle to reliably form films with desirable mixed ratios, domain sizes, and morphologies when co-depositing multiple materials, which can impede charge separation and extraction in organic electronic devices.
Innovation Solution
A method and system that control temperature, pressure, and rotation rate within a process chamber to evaporate and flow multiple materials through separate portions of a showerhead onto a rotating substrate, allowing for precise control of film composition and morphology.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional vapor deposition processes are used to co-deposit multiple materials, then the process is simple and easy to operate, but the resulting films have undesirable domain sizes and morphologies that impede charge separation and extraction
Solution Approach 1:
The showerhead is divided into multiple separate portions (first portion, second portion, third portion) that can independently deliver different materials to the substrate. This segmentation allows precise control over material placement and mixing ratios, enabling desirable film domain sizes and morphologies while maintaining a relatively simple overall process architecture.
Solution Approach 2:
Different portions of the showerhead are assigned different materials (first material, second material, third material) to achieve local control over film composition. This enables precise spatial control of material deposition, creating films with controlled domain sizes and morphologies in specific regions while maintaining overall process simplicity.
2Manufacturing precision
If multiple materials are co-deposited without control of material placement, then the deposition process is simple, but the resulting films form undesirable domain sizes and morphologies
Solution Approach 1:
The showerhead is segmented into multiple independent portions, each capable of delivering a different material. This segmentation provides precise control over material placement and mixing ratios without requiring complex external control systems, as each portion can be independently adjusted to achieve desired film properties.
Solution Approach 2:
The system controls the flow rates of different materials through the showerhead portions by adjusting temperature and pressure parameters. This enables precise control of material placement and film composition through parameter adjustment rather than complex mechanical or electronic control systems.
3Reliability
If conventional vapor deposition is used to form mixed material layers, then the process is straightforward, but reliable formation of multiple material containing layers with desirable mixed ratios cannot be achieved
Solution Approach 1:
The showerhead is divided into multiple portions that can independently deliver different materials at controlled flow rates. This segmentation ensures reliable formation of mixed material layers with precise mixed ratios, as each portion can be independently adjusted to achieve the desired composition without affecting other materials.
Solution Approach 2:
The system uses temperature and pressure parameter control to regulate the flow rates of different materials through the showerhead portions. This enables reliable and repeatable formation of films with controlled mixed ratios through parameter adjustment rather than complex mechanical control systems.
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
Achieves films with desired domain sizes and morphologies, enabling efficient charge separation and extraction in organic electronic devices such as OLEDs and solar cells.
Implementation Method 1
heating materials that are maintained at a desired pressure to a desired temperature such that the heated material is vaporized
Implementation Method 2
the vaporized material condenses onto a surface of the substrate
Implementation Method 3
Vapor deposition processes generally include heating materials that are maintained at a desired pressure to a desired temperature such that the heated material is vaporized and then allowed to be transferred to a substrate where the vaporized material condenses onto a surface of the substrate
Data Source
AI summary
One or more embodiments described herein generally relate to methods and systems for forming films on substrates in semiconductor processes. In embodiments described herein, a process system includes different materials each contained in separate ampoules. Each material is flowed into a separate portion of a showerhead contained within a process chamber via a heated gas line. From the showerhead, each material is flowed on to a substrate that sits on the surface of a rotating pedestal. Controlling the mass flow rate out of the showerhead and the rotation rate of the pedestal helps result in films with desirable material domain sizes to be deposited on the substrate.