Silicon dioxide in mosfet

[vlsitechnology]

Hi Can anyone tell me what is the purpose of silicon dioxide in Mosfet with clear explaination?

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[vlsi_whiz]

The Silicon Di-Oxide (SiO2) layer is used as insulator in semiconductors. In MOSFETS, the SiO2 layer forms the Gate region. Other than these uses..there is another VLSI process called SOI..Silicon On Insulator. This uses the SiO2 as the base insulating layer on which the other layers (Drain, Source,etc) are grown.

 

[vlsitechnology]

But what is the need of that?? Does it provides isolation?? what makes us to go for Sio2

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[vlsi_whiz]

Yes, SiO2 is used for isolation and it can be grown easily when compared to other materials. The process is also simple as it only required oxidation of the already existing Si layer.