Equation 2 · Part 1 · When the Substrate Became the Product
Symbol D_0
What this part means
the defect density.
Its job in the formula
is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.
Full expression→Symbol D_0→Article meaning
Where the article explains it
with defect density , die area A , and a clustering parameter c that captures the fact that defects are not independently scattered [ 2 ] .
The passage around this formula
with defect density , die area A , and a clustering parameter c that captures the fact that defects are not independently scattered [ 2 ] . The exact parameters matter less than the shape. Yield falls monotonically with area, so cost per good die rises faster than area, and past some size the marginal square millimetre costs more than the function printed on it is worth. Feng and Ma note that the reason this became urgent is that two trends met: process improvement slowed while chip area approached the reticle limit, so the historical route to more transistors per part closed from both ends.
Learn the underlying idea
A subscript is a label attached below a symbol. It often selects a time step, component, category, or member of a sequence.
Open the illustrated subscripts: which member of a family? guide →
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Sources cited in the surrounding passage
These citations provide research context; check each source for the exact claim it supports.