Arsenic is diffused into a thick slice of silicon with no previous arsenic in it at 1100°C. If the..

Arsenic is diffused into a thick slice of silicon with no previous arsenic in it at 1100°C. If the surface concentration of the arsenic is 5.0 × 1018 atoms/cm3 and its concentration at 1.2 _m below the silicon surface is 1.5 × 1016 atoms/cm3, how long must be the diffusion time? D = 3.0 × 10_14 cm2/s for As diffusing in Si at 1100°C.