Chemical vapor deposition (CVD): This process involves the chemical reaction of a vaporized precursor gas with a substrate to deposit a thin film. For example, silicon nitride (Si3N4) can be deposited by the reaction of silane (SiH4) and ammonia (NH3) gases at high temperatures.

Physical vapor deposition (PVD): This process involves the physical deposition of material onto a substrate by evaporation or sputtering. For example, metal films can be deposited by thermal evaporation, where the metal is heated until it vaporizes and then condenses on the substrate.

Electrodeposition: This process involves the deposition of material onto a substrate by electrochemical reactions. For example, copper can be electrodeposited by immersing the substrate in a copper sulfate solution and applying a voltage between the substrate and a copper electrode.

Molecular beam epitaxy (MBE): This process involves the growth of single-crystal thin films by the sequential deposition of individual atomic layers. For example, gallium arsenide (GaAs) can be grown by MBE by alternately depositing layers of gallium and arsenic atoms on a substrate.

Atomic layer deposition (ALD): This process involves the sequential deposition of individual atomic layers by alternating pulses of precursor gases. For example, aluminum oxide (Al2O3) can be deposited by ALD by alternating pulses of trimethylaluminum (TMA) and water (H2O) gases.