Question

Buffered hf is used as an etchant to etch out sio2 layer, known as boe (buffered oxide etch). Which kind of etching is this?

Answer 1

Answer:

This is a type of wet etching which is used in the process of microfabrication.

Explanation:

A buffered oxide etch (BOE) is the main etchant used in the process. It is known to be a mixture of hydrofluoric acid and ammonium fluoride( buffering agent).

This mixture etches silicon dioxide quite easily and quickly. Its advantage is that it can be used for controllable etching.