The advantages of sputtering include better step coverage, less radiation damage compared to E-beam evaporation, and easier deposition of alloys. Sputtering also offers benefits such as uniformity, low impurity levels, high film density, scalability, and high deposition rates. It is widely used for thin film metallization, coatings on glass and polymers, magnetic films, and decorative coatings.
However, there are also disadvantages to sputtering. The sputtering rates are generally lower compared to thermal evaporation. The deposition flux distribution may be non-uniform, requiring additional fixturing to obtain uniform thickness films. Sputtering targets can be expensive and may have poor material use. The heat generated during sputtering needs to be effectively removed. In some cases, gaseous contaminants can be activated in the plasma, leading to film contamination. Reactive sputter deposition requires careful control of the gas composition to prevent poisoning the sputtering target. Sputtering also has high capital expenses, relatively low deposition rates for certain materials, and can easily degrade organic solids due to ionic bombardment. Additionally, sputtering has a greater tendency to introduce impurities in the substrate compared to deposition by evaporation.
In terms of sputtering vs evaporation, sputtering offers advantages such as easier deposition of large-size targets, easy control of film thickness by adjusting deposition time, easier control of alloy composition, and avoidance of device damage from X-rays generated by electron beam evaporation. However, sputtering also has higher capital expenses, lower deposition rates for some materials, and the potential for substrate heating due to energized vapor material.
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