The interface between silicon and silica. High-purity silicon powder has good interfacial properties. Compared with the interface of other semiconductor materials corresponding to the oxide layer, the interface between silicon and silicon dioxide is perfect. With the development of technology, the control of interface defects is getting better and better. For example, after the cleanroom renovation, the impact of defects has been very low. At the same time, when injecting impurities, silicon dioxide can serve as a shielding layer, effectively blocking impurities such as phosphorus and boron.
The second is that high-purity silicon powder is a very stable insulator material (its energy gap is about 9ev, I don't know if I remember it correctly), while germanium dioxide is not only unstable at high temperatures, but also soluble in water. Silicon dioxide has no such problem at all; silicon dioxide's large energy gap will make its leakage current smaller (of course, if the oxide layer is too thin, the leakage current will increase).
Compared with germanium, high-purity silicon powder has a larger energy gap and therefore can withstand higher operating temperatures and a wider impurity doping range. The breakdown voltage of silicon materials will also be higher. In the past, semiconductor devices were all made of germanium. The technology was mature and the switching response speed was faster. However, this thing requires a high cost. Capitalists chose silicon, so many scientists began to make breakthroughs in silicon. Of course, this is related to the many excellent properties of silicon itself, such as large reserves and stable performance. Another advantage is that silica is a natural insulator and can be used directly as an interlayer after heat treatment.
High-purity silicon powder with silicon content of 99% (2N), 99.9% (3N), 99.99% (4N) and extremely low oxygen, carbon, phosphorus, sulfur and metal impurities, which can meet the needs of industrial processes with high impurity requirements. needs, filling the gap in the field of domestic high-purity industrial silicon powder. Aluminum alloys, titanium alloys, copper alloys, high-performance silicon nitride and carbon...
