Specific Process Knowledge/Wafer cleaning/7-up & Piranha: Difference between revisions
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{{fnb|1}} In preparing a solution involving an acid, always add the acid last. The exception to this rule is Piranha, in which case you add H<sub>2</sub>O<sub>2</sub>, which is a very strong oxidant, to H<sub>2</sub>SO<sub>4</sub>, which is a very strong acid. This is done because it is potentially explosive and at the very least will cause the solution to become very warm. | {{fnb|1}} In preparing a solution involving an acid, always add the acid last. The exception to this rule is Piranha, in which case you add H<sub>2</sub>O<sub>2</sub>, which is a very strong oxidant, to H<sub>2</sub>SO<sub>4</sub>, which is a very strong acid. This is done because it is potentially explosive and at the very least will cause the solution to become very warm. | ||