Of importance with respect to the present invention is {TAIL ~ the hole} blocking {HEAD ~ layer} which is comprised as schematically represented by formula a crosslinked polymer derived from crosslinking a silyl functionalized electron transport polymer with an organosilane as represented by  
Of importance with respect to the present invention is { TAIL ~ the hole } blocking { HEAD ~ layer } which is comprised as schematically represented by formula a crosslinked polymer derived from crosslinking a silyl functionalized electron transport polymer with an organosilane as represented by
OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH