| 초록 |
Semiconducting quantum dots (QDs) stability issues that include degradation of optical properties by oxygen and water are yet to be addressed. Post treatments to isolate QDs from oxygen and water which include encapsulation with inert particles, grafting of stable polymers inevitably lower PLQY of QDs to some by damaging the QD surface or detaching the ligands. Post treatment which include halide attachment to QD surface has been reported and showed PLQY and stability enhancement among PbSe based QDs. We study the effect of zinc chloride (ZnCl2) addition during synthesis of In(Zn)P QDs focusing on the simultaneous indium carboxylates ligand exchange and magic-sized cluster(MSC) evolution. QDs(core) synthesized through this method showed resistance to oxygen and water; retaining initial absorption excitonic peak and valley depth ratio. Furthermore, additional shelling process to synthesize In(Zn)P-ZnCl2/ZnSe/ZnS was carried out. We believe this research introduce simultaneous treatment with ZnCl2 during synthesis of QDs core which facilitates the synthesis procedure by excluding the post treatment step. In addition, effect of ZnCl2 during MSC evolution were studied. |
