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