Native defects in undoped semi-insulating CdSe studied by photoluminescence and absorption

Photoluminescence of CdSe nanowires grown with and without metal catalyst

“…1(a) disappear above 70 K [53], whilst peak H is seen up to 200 K ( Fig. 1(b)) [57]. This can be linked to the binding energy of the shallowest state, thus providing insights on its physical nature [57].…”

“…Before considering PL from CdSe NWs, it is important to analyze the PL features in bulk and thin film CdSe [9,[53][54][55][56][57][58][59][60]. An unambiguous match between emission peaks (or bands) measured by different groups is difficult, and a full understanding of the origin of each band is still missing.…”

“…Table 1 summarizes the main PL features for bulk CdSe, as reported in Refs. [9,[53][54][55][56][57][58][59][60]. We classify the bands in various families, according to peak position, lineshape, or suggested literature assignment.…”

“…Intra-band-gap states giving optical recombinations in the "shallow states" region are commonly referred to as donor-acceptor pairs (DAP, see Table 1) [53,55,[57][58][59]. However, this is quite a generic definition, as both states involved in the process (donor and acceptor) can have a number of different origins (impurities, structural defects, etc.)…”

“…1(b)) [57]. This can be linked to the binding energy of the shallowest state, thus providing insights on its physical nature [57].…”