A Brief Analysis of the Production Process of Schottky Diodes
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As we all know, the Schottky diode uses the Schottky structure, which plays a huge advantage in some special applications. Follow me to Liantuo, and let's see how the Schottky diode was born.
The production technology of international diodes is now very mature and transparent, and the vast majority of Schottky diodes use silicon wafers as the substrate. Grinding and polishing the substrate is the first process step, we remove impurities and ensure the smoothness of its surface.Then, the silicon wafer is thoroughly cleaned to remove organic matter and dirt from the surface in preparation for subsequent operations.
Next, the starch film needs to be peeled off. This is a soluble film material, the purpose of which is to form a film on the surface of the silicon wafer to protect the surface of the silicon wafer and act as a shield in other process steps. We then added an acidic solution to strip the starch film, resulting in a flat silicon wafer.
In the back-side deposition step, a back contact electrode is formed, usually using metal materials such as aluminum and copper to improve the conductivity of the circuit structure.
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Activation is a crucial step in the fabrication of Schottky diodes. After heat treatment of the back contact electrode, good contact is formed with the silicon wafer. This process improves the performance of Schottky diodes.
As a special material to limit the flow of electrons and holes, the deposition of the blocking layer is also an important step to improve the performance of Schottky diodes. We usually use silicon nitride and aluminum nitride for this step. Before that, we need to clean the silicon wafer to ensure the adhesion between the barrier layer and the silicon wafer.
The last and most important step is the production of the metal wire. This is an important part of connecting the Schottky diode, which needs to be produced through process steps such as electroplating.Aluminum or copper with good conductivity is the main material for making metal wires.
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