A first blocking layer is formed of {TAIL ~ amorphous silicon carbide} or {HEAD ~ amorphous silicon nitride} on a conductive substrate 
A first blocking layer is formed of { TAIL ~ amorphous silicon carbide } or { HEAD ~ amorphous silicon nitride } on a conductive substrate
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH