What role does silicon dioxide play in integrated circuits?
Silica in integrated circuit fabrication process, can prevent impurity diffusion, which provides selective diffusion may, for example to generate a complete layer of silica on silicon wafers, using lithography method, silica selectively etched parts
In addition silica is a good insulator in integrated circuit fabrication process and finally to disperse diodes, transistors, resistors and other components connected with the aluminum strip, some places need not even, in some places, not even the place covered with silica on the line, and even the need to place, also for lithography the way is selectively etched by the aluminum strip can pass through, even up.
Then, doping at high temperatures (e.g. boron doped) allows boron to diffuse into this region without silica protection, thus becoming a P type region (usually the base region)
