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Term (Index) Definition
diffusant  specie moving in the solid by diffusion
diffusion  in general, motion of species in solids in the direction of concentration gradient; (i)diffusion of free charge carriers in semiconductor; (ii) diffusion of dopant atoms in semiconductor at elevated temperature; (iii) diffusion - common name of the high temperature process during which dopant atoms are introduced into semiconductor by diffusion.
diffusion coefficient, D  determines rate with which element moves in a given solid by diffusion; depends strongly on temperature; expressed in cm2/sec; varies between elements by orders of magnitude, e.g. in the case of diffusion in silicon diffusion coefficient for gold, Au, is in the range of 10-3 cm2/sec (fast diffusant) while for Sb is in the range of 10-17 cm2/sec.
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