Photochemical Etching for ITO Surface Planarization
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Solution Overview
Problem
Conventional surface planarization methods for ITO films, such as CMP, suffer from issues like scratches, contamination, and limitations in minute planarization due to their contact-based nature and structural characteristics of ITO films, making it difficult to achieve precise nanometer-scale planarization.
Innovation Solution
A non-contact surface planarization method using a light source of specific wavelengths, combined with etching reactive gases like Cl2, Br2, CF4, SF6, and HBr, which interact with the surface to remove minute protrusions, minimizing scratches and contamination while allowing precise control in nanometers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If CMP method is used for planarization, then surface roughness is reduced, but the substrate surface is scratched or contaminated
Solution Approach 1:
The patent replaces the mechanical polishing system (CMP method with slurry and polishing pad) with a photochemical etching system using light source and reactive gas. This substitution eliminates mechanical contact that causes scratches and contamination, while achieving surface planarization through controlled chemical etching of protrusions.
Solution Approach 2:
The patent changes the physical and chemical parameters of the etching process by controlling light intensity, gas flow rate, and temperature to achieve selective etching of surface protrusions. By adjusting these parameters, the etching rate is controlled to planarize the surface without causing damage.
2Manufacturing precision
If conventional planarization methods are used, then surface planarization is achieved, but minute planarization in nanometer scale is difficult
Solution Approach 1:
The patent replaces conventional mechanical polishing systems with a photochemical etching system that uses light and reactive gas. This substitution enables precise nanometer-scale control through optical parameters and gas flow control, achieving minute planarization that is difficult with mechanical methods.
Solution Approach 2:
The patent implements feedback control by monitoring surface roughness during the etching process and adjusting light intensity and gas flow rate accordingly. This feedback mechanism enables precise control of the etching rate to achieve the desired nanometer-scale planarization.
3Manufacturing precision
If heating and plasma-etching method is used, then planarization is performed using temperature difference, but it is not suitable for minute planarization in nanometer scale
Solution Approach 1:
The patent changes from thermal parameter control (heating method) to photochemical parameter control (light intensity and gas flow). This parameter change enables more precise control at nanometer scale through optical and chemical parameters rather than thermal gradients, achieving better minute planarization.
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 effectively reduces surface roughness, improves electric conductivity, and enhances the efficiency and output of LED devices by enabling precise planarization in nanometers without the drawbacks of conventional methods, such as scratches or contamination, and can be applied to various materials including ITO, FTO, and organic polymers.
Implementation Method 1
inputting the light source of a specific wavelength onto a surface of the object... the surface of the object is planarized by interaction between the injected etching gas and the inputted light source
Implementation Method 2
injecting an etching gas into the main chamber... the surface of the object is planarized by interaction between the injected etching gas and the inputted light source
Data Source
AI summary
A method for surface planarization of an object using a light source of a specific wavelength according to an embodiment includes: providing an object in a main chamber; injecting an etching gas into the main chamber; inputting the light source of a specific wavelength onto a surface of the object; and controlling a temperature of the object. According to the method, it is possible to minimize the side effects such as scratches or contamination of the sample that occur in a conventional chemical-mechanical planarization process. In addition, it is possible to allow precise planarization in nanometers (nm) and simultaneously perform planarization to a side surface of a device as well as a large-sized surface, thereby reducing cost and time required for the planarization process. Moreover, since the surface roughness and the electrical conductivity are improved, it is possible to increase the efficiency and output of the LED device.