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The key role of BOE etching technology in semiconductor manufacturing
Category:
Process Technology
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Release time:
2025-04-03
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I. Principle of BOE Etching of Silicon Dioxide
The principle of BOE etching of silicon dioxide is based on the reaction between fluoride ions and silicon dioxide to form fluorosilicate ions (H2SiF6). This reaction process is a dissolution-reprecipitation process. When the HF concentration is low, silicon dioxide is easily dissolved, and the dissolution rate is faster; when the HF concentration is high, the fluorosilicate ions generated by the dissolution of silicon dioxide and the fluorosilicate layer formed on the surface of silicon dioxide will inhibit the continued dissolution reaction, thus slowing down the etching rate. Therefore, the etching rate of BOE is controlled by the concentration of HF.
II. Factors Controlling the Etching Rate
In addition to HF concentration, temperature also has a significant impact on the etching rate. However, excessively high temperatures can cause the etchant to evaporate, so the stable operating range is generally between 20-40 degrees Celsius. Etching time is also an important factor affecting the etching depth; the longer the etching time, the deeper the etching depth.
III. Application of BOE in Semiconductor Manufacturing Processes
BOE can efficiently etch silicon dioxide on silicon substrates to form tiny holes, pits, or patterns, so it is widely used in semiconductor manufacturing processes. For example, in the manufacture of MOSFETs (metal-oxide-semiconductor field-effect transistors), an oxide layer needs to be formed on the silicon substrate, and BOE can be used to remove the oxide layer for subsequent process steps. In addition, BOE can also be used to manufacture MEMS (microelectromechanical systems) and other micro-devices.
In general, BOE etching of silicon dioxide is an important step in semiconductor manufacturing processes. By controlling the etching time, temperature, and HF concentration, SiO2 films can be precisely removed, providing a good foundation for subsequent process steps.
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2025/03/05
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