Sputter coated glass is a type of glass that has been treated with a thin, functional coating using a process called sputter deposition. This process involves electrically charging a sputtering cathode to form a plasma, which ejects material from a target surface onto the glass substrate. The coating is applied at a molecular level, creating a strong bond at an atomic level, making it a permanent part of the glass rather than just an applied coating.
The process of sputter coating is beneficial due to the stable plasma it creates, which ensures a uniform and durable deposition. This method is commonly used in various applications, including solar panels, architectural glass, microelectronics, aerospace, flat panel displays, and automotive industries.
In the context of glass coating, sputtering targets are used to produce low-radiation coated glass, also known as Low-E glass. This type of glass is popular in building construction due to its energy-saving properties, ability to control light, and aesthetic appeal. The sputter coating technology is also employed in the production of third-generation, thin-film solar cells, which are in high demand due to the growing need for renewable energy.
However, it's important to note that sputtered coatings applied independently of the float glass manufacturing process (off-line) result in a "soft coating" that is more prone to scratching, damage, and chemical fragility. These commercial sputtered coatings are typically applied in a vacuum chamber and consist of multiple layers of thin metallic and oxide coatings, with silver being the active layer for Low-E sputtered coatings.
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