In the fields of semiconductors, display panels, and new materials, the surface properties of materials are often closely related to the quality and reliability of products. Unicon Technology Co., Ltd. has been focusing on film thickness measurement, surface morphology measurement, material mechanical performance testing, surface defect detection and other fields in recent years. Help users solve corresponding problems. But as customers' demands for product performance continue to rise, new demands continue to emerge, and thickness and morphology have been measured. How can the characteristics of the surface and interface be quantified?
Give a few examples. In semiconductor factories, after RCA standard cleaning, does the surface of the wafer dry completely? You can measure the surface contact angle after cleaning to see if it reaches 70 to 90 degrees. The AF anti fingerprint coating made by the display panel factory has no visible effect to the naked eye after coating, but the contact angle measured by the water droplet angle device is considered qualified if it is greater than 110 °. For plasma treatment, the contact angle is 95 ° before treatment and reduced to 30 ° after treatment. These data can make the surface treatment effect clear at a glance. When spin coating photoresist, the contact angle is too large, and the adhesive droplets aggregate into liquid droplets on the wafer surface, resulting in direct coating failure; If the contact angle is too small and the coating is too thin, the thickness cannot be guaranteed. These questions cannot be answered using only optical film thickness gauges and step gauges.
This is where the value of the waterdrop angle measuring instrument lies. The droplet angle (contact angle) is a core parameter that characterizes the wettability of solid surfaces. Changes in surface chemical composition, contamination, and uneven treatment can cause significant changes in the contact angle. According to market research institutions, the global market for optical contact angle measuring instruments is expected to reach 410 million US dollars by 2031. The quantitative testing of surface properties in the manufacturing industry is increasingly inseparable from the measurement of surface interface characteristics.
Droplet angle, in simple terms, refers to the angle formed at the intersection of air, droplet, and solid surface when a droplet falls onto a solid surface. The smaller the angle, the more hydrophilic the surface, and the larger the angle, the more hydrophobic the surface.
There are several characteristics of droplet angle measurement:
Non destructive testing with sensitive feedback. We use ultrapure water, which does not damage the sample when dropped. Even if there are tiny structural changes on the surface or something is attached, the contact angle will change. The semiconductor wafer inspection is most afraid of damaging the sample, and the droplet angle measurement equipment solves this problem perfectly.
Quantify the surface treatment effect. The surface modification processes such as plasma treatment, corona treatment, and flame treatment cannot be seen with the naked eye whether they are done properly or not. The droplet angle turns the results of surface treatment into tangible numbers, such as reducing the contact angle from 95 ° to 30 ° after plasma treatment. Once the data is displayed, the effectiveness of the treatment can be clearly seen.
Predict adhesion and coating performance. Wettability is a prerequisite for the success of bonding, coating, and printing processes. The contact angle is not suitable, and it will not stick or apply evenly afterwards. If there are problems, rework will be done, which will increase the cost. Testing in advance gives you more confidence.
KR Ü SS, founded in 1796, has been dedicated to the field of surface and interface measurement for nearly 60 years. They introduced the first fully automatic surface tension meter and the first fully automatic contact angle measuring instrument. KR Ü SS's DSA series droplet shape analyzer can be considered a benchmark in the industry.
Static contact angle: Evaluating the basic wetting characteristics of material surfaces
Dynamic contact angle (forward angle and backward angle): reflects the behavior of the surface during wetting and de wetting processes
Rolling angle: Evaluating the self-cleaning ability of hydrophobic surfaces
Surface Free Energy (SFE): Analyzing the Polarity and Dispersion Components of Solid Surfaces
Surface tension: measuring the interfacial tension of a liquid
KRUSS's micro pressure double titration system. Both water and diiodomethane test solutions can be dripped simultaneously, and it only takes one second from dripping to calculating the surface free energy. Titration does not require needles, saving the risk of syringe contamination.
Built in ADVANCE software. The process from sample preparation to measurement to obtaining results is very clear, and there is no need to search for functions in the menu.
Excellent environmental control. It can be measured from minus 30 degrees Celsius to 400 degrees Celsius, and the humidity can also be controlled. The impact of droplet evaporation can be avoided.
Stood up Drop method. It takes only a few seconds to measure the retreat angle. The results obtained are highly correlated with traditional hundred grid testing, but the measurement speed is much faster.
Semiconductor and wafer manufacturing
The cleanliness and uniformity of the wafer surface are monitored by the contact angle. The contact angle of photoresist on the wafer surface directly determines whether the spin coating process can be achieved. Before wire bonding, whether the bonding pad is dry or oxidized can be judged by the micro upgraded contact angle measurement. When filling the bottom of the chip, the wettability of the epoxy resin determines whether it can be completely covered and whether there are bubbles.
display panel
The cleanliness and coating quality of glass panels, as well as the coating quality of previous processes such as TFT printing circuits, color filters, and ITO conductive films, are all controlled by the droplet angle. The AF anti fingerprint coating is not done well, and the water droplet angle is only considered to be greater than 110 °.
Surface treatment and coating
How well are the activation treatments such as plasma, corona, and flame done? Whether the performance of hydrophobic coatings and anti fingerprint coatings meets the standards can be determined by measuring the water droplet angle. How is the adhesion of the coating? Use the shrinkage droplet method to measure the setback angle, and the result is highly correlated with the hundred grid test.
Adhesive and packaging
The wettability and adhesion between the sealant and the component can be determined by measuring the surface free energy and polarity. The adhesion and interfacial tension of the coating are key parameters for ensuring long-term stability in ball top packaging.
New material research and development
The wetting properties of biomimetic superhydrophobic materials, self-cleaning surfaces, fuel cell membranes, and lithium-ion battery separators cannot be studied without contact angle measurement.
automobile manufacturing
The surface properties of car paint, glass waterproof coating, interior leather fabric, and electrode materials for new energy batteries all need to be tested.
Younikon Technology is a professional expert in precision thin film measurement. If customers have requirements, we will introduce corresponding products and technologies, combined with more than ten years of industry experience. Provide users with a complete solution. If you have measurement needs in this area.Welcome to contact us for more product details or to schedule a prototype demonstration.
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