Why do we need 450mm wafers?

This is a question often asked by journalists and others not directly involved in 450mm technology, and indeed was one of the questions that formed the basis of the SMART 2010/062 report Future Horizons produced for the European Commission.

It is also a question every new 450mm project has to answer in its funding request to the European Commission, and whilst working on the Bridge450 submission we realised the arguments have become rather unclear over time. The following gives some insight and clarity into the question.

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