Thin-Film Deposition with Step-Coverage Control for Uniform PVD
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Solution Overview
Problem
Plasma-resistant physical vapor deposition (PVD) coating faces challenges in step coverage and deposition uniformity, particularly on objects with inclined or stepped surfaces, due to increased mean free path and decreased deposition efficiency as particles travel farther, leading to non-uniform thickness and reduced efficiency.
Innovation Solution
A thin-film forming apparatus with a step-coverage control module that adjusts the trajectory of deposition particles using repositioning maneuvers, including central and outer parts to sandwich and guide particles towards the deposition object, ensuring uniform coverage across flat, inclined, and depressed areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If particles move in a straight line during PVD deposition, then deposition efficiency is maintained for nearby areas, but deposition uniformity deteriorates for farther areas and inclined portions due to increased mean free path
Solution Approach 1:
The deposition object is rotated during the PVD process, dynamically changing the relative positions between different surfaces and the particle source. This rotation ensures that inclined portions and stepped areas receive particles from multiple angles, improving step coverage and deposition uniformity across complex geometries while maintaining overall deposition efficiency
Solution Approach 2:
Different regions of the deposition object receive tailored particle flux through selective positioning and rotation. Inclined portions and stepped areas are specifically addressed by adjusting the object's orientation during deposition, ensuring that each local region receives appropriate particle coverage regardless of its distance or angle from the source
2Manufacturing precision
If the deposition object is rotated or tilted to improve step coverage, then deposition uniformity on inclined portions improves, but device complexity and operational difficulty increase
Solution Approach 1:
A rotation mechanism is implemented that automatically adjusts the deposition object's orientation during the PVD process. This dynamic adjustment system simplifies operation by automating the complex positioning required for good step coverage, eliminating the need for manual tilting or repositioning while achieving uniform deposition on inclined and stepped surfaces
3Area of stationary object
If particles travel a longer distance to reach farther areas of the deposition object, then complete coverage is achieved, but deposition efficiency decreases due to increased mean free path
Solution Approach 1:
By rotating the deposition object during deposition, areas that would otherwise be far from the particle source are brought into closer proximity at different rotation phases. This dynamic repositioning ensures that all surfaces, including distant and inclined areas, receive particles at optimal distances, maintaining high deposition efficiency while achieving complete coverage
Solution Approach 2:
The periodic rotation of the deposition object creates repeated cycles of positioning different surfaces at optimal distances from the particle source. This periodic action ensures that all areas receive sufficient particle flux over time, achieving uniform coverage across the entire object surface without sacrificing overall deposition rate
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
Improves step coverage and deposition uniformity, reducing efficiency losses by controlling particle distribution and maintaining uniform thickness across different areas of the target, even on complex surfaces.
Implementation Method 1
a sputtering target placed inside the chamber and containing particles for deposition... a voltage supply module located inside the chamber and configured to supply an electric current to the sputtering target. Here, the deposition object is deposited with the particles provided from the sputtering target based on the electric current
Implementation Method 2
a gas supply module configured to supply a gas for forming a plasma state inside the chamber
Data Source
AI summary
A thin-film forming apparatus and method are provided. A thin-film forming apparatus includes a chamber configured to hold a vacuum formed in the chamber, a deposition object placed at a set position inside the chamber, a sputtering target placed inside the chamber and containing particles for deposition, a gas supply module configured to supply a gas for forming a plasma state inside the chamber, a step-coverage control module located inside the chamber and facing the deposition object, and a voltage supply module located inside the chamber and configured to supply an electric current to the sputtering target, wherein the deposition object is deposited with the particles provided from the sputtering target based on the electric current, and wherein the step-coverage control module is configured to control a step coverage of the deposition object by adjusting an amount of the particles moving toward the deposition object through a repositioning maneuver.