Q.

Which of the following materials is not used as a starting material in vapor-phase deposition technique?

A. sicl4
B. gecl4
C. o2
D. b2o3
Answer» D. b2o3
Explanation: in vapor-phase deposition technique, starting materials are volatile organic compounds. these materials are distilled to reduce the concentration of transition metal impurities. b2o3 is used as a dopant.
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