wafers meaning
Wafers are the basic platform for transistors, diodes, integrated circuits and more. Thousands of tiny electronic components can be created on wafers, and these components form the core of modern electronic devices.
Wafers have a single-crystal structure, which means that their atomic arrangement is uniform and orderly throughout the wafer, which provides a smooth flow path for electrons and is the key to manufacturing high-performance semiconductor devices.
Wafers undergo several complex process steps in the manufacture of semiconductor devices, including photolithography, etching, ion implantation, deposition, chemical vapor deposition (CVD), physical vapor deposition (PVD), and so on.
wafers meaning
Wafer cleaning
Wafer cleaning is a key step in the semiconductor manufacturing process, the purpose is to remove surface contaminants, to ensure that the surface of the wafer is clean, in order to facilitate the subsequent process steps.
The cleaning process usually consists of the following steps: 1. Dumping/Ultrasonic Cleaning: Wafer cleaning consists of both physical and chemical cleaning methods.
2. Chemical Cleaning: Sulfuric acid, hydrochloric acid, or sodium hydroxide solution is used to remove metal ions and natural oxidized layers.
3. Cleaning: Cleaning procedures: generally include steps such as de-molecularization, de-ionization, de-atomization and de-ionized water rinsing.
A dilute hydrofluoric acid soaking step is often added to remove the oxide layer on the wafer surface.
3. Dumping and drying: After cleaning, the wafer needs to be dumped to remove most of the water, and then dried to remove the remaining water.
