ALD Atomic layer deposition for thin film deposition is one of the most important techniques based on the sequential use of a gas phase chemical process;  It can be considered as a special type of chemical vapor deposition (CVD). The majority of ALD reactions use two or more chemicals called precursors (also called "reactants"). These precursors react with the surface of a material one at a time in a sequential, self-limiting, manner. Through the number of ALD cycles, a thin film is slowly deposited. ALD is a important process in manufacturing semiconductor devices, and part of the set of tools available for synthesizing nanomaterials.

ALD has a number of advantages such as excellent uniformity, film conformality with identical film thicknesses deposited on the wafer surface even complex shapes substrates, low temperature processing. Therefore, ALD is applied for many applications in the field of microelectronics, nanotechnology and biotechnology which often working on soft substrates, such as organic and biological samples.




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