thin film

A thin film is a very thin layer of a substance on a supporting material, often a coating deposited one atom or molecule thick. In chemistry and manufacturing, thin films are crucial for creating electronic components like diodes, transistors, capacitors, and resistors.12

These films are built in layers, sometimes over 30 layers thick, on a semiconductor substrate. Creating these layers involves deposition (adding material), etching (removing material), or implantation (altering material composition).2

Deposition techniques include:
* Physical methods: Such as sputtering, where ions knock atoms loose from a source to form a vapor that condenses on the substrate. Evaporation deposition heats a metal source in a vacuum, and its vapor condenses on the wafer.2
* Chemical methods: Such as chemical vapor deposition (CVD), where gases react to form a compound deposited on a substrate.3

Advanced techniques like molecular beam epitaxy (MBE) allow for atomic layer-by-layer deposition, enabling precise control for electronic and photonic applications.3