Phosphorus in {HEAD ~ high concentrations} will induce stress in {TAIL ~ the crystal lattice} due to the difference in the atomic radius of silicon atoms versus phosphorus atoms 
Phosphorus in { HEAD ~ high concentrations } will induce stress in { TAIL ~ the crystal lattice } due to the difference in the atomic radius of silicon atoms versus phosphorus atoms
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH