Graphene Pellicle Thickness Control via Ozone Etching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for forming graphene thin films for pellicle materials face challenges in achieving the required thickness of 10 to 15 nm, as existing low-temperature direct growth methods result in thicker films, and etching techniques like wet etching and plasma etching are limited by graphene's chemical stability and can lead to unevenness and mechanical stress.
Innovation Solution
A method involving ozone treatment followed by heat-treatment etching is employed to control the thickness of graphene thin films. The process includes forming graphene on a substrate, exposing the graphene layer to ozone at specific temperatures and times, and then heat-treating the ozone-treated graphene layer to achieve the desired thickness of 10 to 15 nm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If wet etching or plasma etching is used to reduce graphene thickness to 10-15 nm, then the desired thickness can be achieved, but the graphene layer becomes uneven and mechanical stress increases
Solution Approach 1:
The patent changes the chemical environment parameters by introducing ozone gas treatment before etching. This modifies the graphene surface chemistry to enable controlled thickness reduction to 10-15 nm while maintaining uniformity and mechanical strength, resolving the contradiction between achieving target thickness and preserving structural integrity
Solution Approach 2:
Ozone gas acts as an intermediary substance that facilitates the etching process. The ozone treatment creates a controlled chemical environment that enables precise thickness control without the harmful effects of conventional wet or plasma etching, allowing thickness reduction while maintaining graphene quality
2Temperature
If low-temperature direct growth method is used to form graphene, then formation temperature is reduced by 400-500°C compared to conventional CVD, but the resulting graphene thickness is about 30 nm which is too thick for pellicle application
Solution Approach 1:
The patent segments the graphene thickness control process into two distinct stages: first, low-temperature direct growth forms the initial graphene layer at reduced temperature; second, ozone-based etching precisely removes excess material to achieve the target 10-15 nm thickness. This segmentation allows independent optimization of temperature and thickness parameters
Solution Approach 2:
The low-temperature direct growth method performs preliminary graphene formation at reduced temperature (400-500°C lower than conventional CVD), creating a thicker initial layer that is then precisely thinned by ozone etching to the desired 10-15 nm thickness for pellicle application
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 method allows for easy control of graphene thin film thickness, achieving excellent extreme ultraviolet transmittance and uniformity while maintaining mechanical strength by minimizing damage during the etching process, and enabling uniform deposition of a capping layer through surface functionalization.
Implementation Method 1
an ozone treatment step of exposing the graphene layer formed in the graphene forming step to ozone
Implementation Method 2
an etching step of heat-treating and etching the ozone-treated graphene layer
Data Source
AI summary
A method for manufacturing a graphene thin film for a pellicle material using ozone gas includes a graphene forming step of forming graphene on an upper surface of a substrate, an ozone treatment step of exposing the graphene layer formed in the graphene forming step to ozone, and an etching step of heat-treating and etching the ozone-treated graphene layer.