What is the principle of ultrasonic atomization spraying?

Ultrasonic spraying is a unique spraying technology, which is a spraying method based on ultrasonic atomizing nozzle technology. The spraying material is first in liquid state. The liquid can be a solution, sol, suspension, etc. The liquid coating is first atomized into fine particles by an ultrasonic atomizing device, and then evenly coated on the surface of the substrate by a certain amount of carrier gas to form a coating or film. Compared with traditional air pressure two-fluid spraying, ultrasonic atomizing spraying can achieve better uniformity, thinner coating thickness, and higher precision. At the same time, since the ultrasonic nozzle does not require air pressure assistance to atomize, the use of ultrasonic spraying can significantly reduce the splash of paint during the spraying process and achieve the purpose of saving paint. The paint utilization rate of ultrasonic spraying is more than 4 times that of traditional two-fluid spraying.

Ultrasonic spraying is achieved through ultrasonic atomization technology. The energy of ultrasound disperses water or liquid to form particles ranging from a few microns to 100 microns in size, which allows ultrasound to be used in spraying. Ultrasonic atomization technology provides different types of atomizing nozzles to help determine the droplet size, liquid flow rate and spray pattern, and the whole machine is used to achieve all-round spraying to meet various needs.

Principle

Ultrasonic nozzles use piezoelectric transducers to convert high-frequency sound waves into mechanical energy, which vibrates longitudinally at high frequencies. This longitudinal upward and downward movement generates standing waves in the applied liquid film at the tip of the ultrasonic nozzle, and the amplitude of these waves can be controlled by the ultrasonic generator. The liquid waves extend upward from the tip of the ultrasonic nozzle until they are separated into droplets of uniform size and almost no kinetic energy. The secondary molding gas or surrounding air can easily wrap the droplets into the desired shape and speed to achieve various spraying.

Applications for Solar Cell Coatings

Ultrasonic spray technology can successfully deposit anti-reflective layers for thin film solar cell coatings, TCO coatings, buffer coatings, PEDOT, and active layers in thin film and perovskite solar cell manufacturing. OPV, CIG, CdTE, CzT, Perovskite, and DSC are some of the solutions and suspensions that can be deposited using ultrasonic wet spray technology in the manufacture of thin film solar cells. At a fraction of the cost of CVD and sputtering equipment, ultrasonic atomizing spray head systems reduce the cost per watt for manufacturing thin film solar cells while still providing high cell efficiency.

Ultrasonic spray machines are a fraction of the cost of sputtering and CVD equipment, and systems are used in R&D for perovskite spraying and other thin film solar manufacturing applications. Ultrasonic spray technology continues to gain acceptance as a viable method to scale up to larger sizes and higher volumes of thin film solar manufacturing. Proven R&D processes play an important role in translating into high volume manufacturing operations for many different layers and types of solar cell technologies and thin film solar cell coatings.

Advantages for solar cell coating

1. The spray pattern is easy to form, suitable for solar cell coating application.

2. Any shape object can be sprayed to form a uniform micron-level coating.

3. Self-cleaning, non-clogging ultrasonic nozzle can reduce downtime in critical manufacturing.

4. Ultra-low flow capacity, can work intermittently or continuously.

5. Highly controllable spray volume, more reliable spray quality.

6. Low energy consumption, high atomization efficiency, less restriction on atomized liquid.

7. High transmission efficiency, can reduce waste and air pollution caused by backsplash, saving a lot of costs.

8. No pressure, no noise, no wear of moving parts.

9. The ice dragon is made of titanium alloy material, which has the characteristics of high strength and corrosion resistance.

10. Low maintenance time, further improving productivity.

11. High-precision pressure reducing valve and liquid control valve to achieve gas-liquid coordination at various speeds.

12. Use laser alignment to quickly align the spraying position.

13. It can work at high temperatures of hundreds of degrees and is used for solar cell coatings. The process is simple and efficient.