Innovative etching solution formulations play a crucial role in optimizing the etching angle for copper-molybdenum (Cu-Mo) etching processes. Below is a detailed analysis of these formulations and how they contribute to angle optimization:
I. Overview of Innovative Etching Solution Formulations
In recent years, with the continuous advancement of display technologies, the Cu-Mo etching processes in TFT-LCD panel manufacturing have faced stricter requirements. To optimize the etching angle and improve etching precision and efficiency, researchers have developed various innovative etching solution formulations. These formulations typically consist of a multitude of chemical components, such as oxidants, chelating agents, regulators, stabilizers, corrosion inhibitors, etc. By precisely controlling the proportion and interaction of these components, they achieve efficient and stable etching effects.
II. Characteristics of Innovative Etching Solution Formulations
- Fluorine-free and Nitrate-free Formulations:
- To reduce harm to the environment and operators, many innovative etching solutions opt not to include fluoride ions and nitrate radicals. For example, some formulations utilize hydrogen peroxide as the primary oxidant, combined with organic acids, organic bases, and other components, achieving efficient etching while maintaining environmental friendliness.
- High Copper Ion Tolerance:
- Some innovative etching solutions exhibit exceptional tolerance to copper ions, maintaining stable etching effects even at high copper ion concentrations. This helps extend the service life of the etching solution and reduces production costs.
- Precise Control of Etching Angle:
- By adjusting the proportions of chelating agents, corrosion inhibitors, and other components in the etching solution, it is possible to precisely control the etching angle to meet process requirements. For instance, certain formulations’ chelating agents sequester generated copper-molybdenum ions, preventing hydrogen peroxide decomposition and thus maintaining etching angle stability.
- Reduced Molybdenum Residue and Undercutting:
- Innovative etching solutions often contain various corrosion inhibitors and suppressants that reduce molybdenum residue and undercutting, enhancing the quality of etched profiles.
III. Specific Examples of Innovative Etching Solution Formulations
Here are some specific examples of innovative etching solution formulations that optimize the Cu-Mo etching angle in varying degrees:
- Etching Solution for Copper-Molybdenum Alloy Layer in TFT-LCD Manufacturing (Source: Qichacha)
- Composition: 5%-25% hydrogen peroxide, 2%-4% chelating agent, 1%-2% regulator, 0.05%-0.5% stabilizer, 0.05%-0.5% corrosion inhibitor A, 0.05%-0.5% corrosion inhibitor B, 0.5%-1% multifunctional additive, and the remainder as ultrapure water.
- Features: Excellent etching characteristics, maintaining an etching angle of 35-50° and a CD loss of 0.80±0.20um with copper ion concentrations ranging from 1000 to 7000 ppm. Etched slopes are straight, with no molybdenum residue or undercutting.
- Single-Component High-Efficiency Long-Life Cu-Mo Etching Solution (Source: Ebook Union)
- Composition: 5-10 parts oxidant; 1-3 parts ternary inorganic acid; 2-8 parts organic acid; 4-9 parts organic base; 0.1-1 part dihydrogen phosphate and/or dihydrogen arsenate; 0.05-0.1 part organometallic salt; 0.001-0.005 part etching inhibitor; 70-85 parts deionized water.
- Features: Applicable to copper processes in TFT-LCD panel manufacturing, requiring no additional inhibitor during Cu-Mo metal layer etching. Achieves high-efficiency etching with a stable service life up to 10,000 ppm dissolved copper content.
- An Etching Solution for Cu-Mo Metals (Source: Ebook Union)
- Composition: 8-20 parts hydrogen peroxide; 0.01-1 part fluoride; 0.01-1 part metal corrosion inhibitor; 0.1-10 parts hydrogen peroxide stabilizer; 0.1-10 parts metal chelating agent; 1-10 parts amine compound; 0.1-10 parts pH regulator.
- Features: Non-damaging to IGZO substrates, with an etching angle suitable for process requirements, and no molybdenum trailing or residue.
IV. Conclusion
Innovative etching solution formulations, through optimizing the proportion and interaction of their components, enable precise control over the Cu-Mo etching angle. These formulations not only enhance etching precision and efficiency but also reduce production costs and environmental impact. With technological advancements