Namely, the band gap and n type doping of the wide band gap layer are adjusted to suppress {HEAD ~ diffusion} of {TAIL ~ the thermally excited carriers} 
of
Namely , the band gap and n type doping of the wide band gap layer are adjusted to suppress { HEAD ~ diffusion } of { TAIL ~ the thermally excited carriers }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL