The conductivity of {TAIL ~ the polysilicon} may be increased by increasing the concentration of {HEAD ~ the conductive impurities} 
The conductivity of { TAIL ~ the polysilicon } may be increased by increasing the concentration of { HEAD ~ the conductive impurities }
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD