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How to pronounce diazonaphthoquinone
Diazonaphthoquinone (DNQ) is a diazo derivative of naphthoquinone. Upon exposure to light, it undergoes a Wolff rearrangement to form a ketene. This chemical reaction is exploited with a variety of diazonaphthoquinone derivatives in the semiconductor industry.
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Diazonaphthoquinone sulfonic acid esters are commonly used as components of photoresist materials for semiconductor manufacturing. In this application DNQs are mixed with Novolac resin, a type of phenolic polymer. The DNQ functions as a dissolution inhibitor. During the masking/patterning process, portions of the photoresist film are exposed to light while others remain unexposed. In the unexposed regions of the resist film, the DNQ acts as a dissolution inhibitor and the resist remains insoluble in the aqueous base developer. In the exposed regions, the DNQ forms a ketene, which, in turn, reacts with ambient water to form a base soluble indene carboxylic acid. The exposed regions of the photoresist film become soluble in aqueous base; thus allowing the formation of a relief image during development.
How to pronounce diazonaphthoquinones
