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VLSI FABRICATION TECHNOLOGY - Oxford University Press

A.1.4 Etching To permanently imprint the photographic patterns onto the wafer, chemical (wet) etching or RIE dry etching procedures can be used. Chemical etching is usually referred to as wet etching. Different chemical solutions can be used to remove different layers. For example, hydrofluoric (HF) acid can be used to etch SiO 2

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