Direct optical patterning of colloidal InP-based quantum dots with ligand-pair treatment
발표자
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초록
내용
Direct optical lithography of functional inorganic nanomaterials (DOLFIN) with photoacid generator (PAG) enables high-resolution patterning of quantum dots (QDs) without complete ligand exchange. However, PAG-based patterning process can often reduce photoluminescence quantum yield (PLQY) of patterned QDs by generating deep trap states, especially critical in InP-based core/shell QDs. To overcome this, we have conducted systematic studies to achieve high-resolution InP/Zn(Se,S) core/shell QD patterns while minimizing the reduction in PLQY. We demonstrate high-resolution patterns of InP/Zn(Se,S) QDs by using DOLFIN with a triazine-based PAG. We investigated optical and structural changes during patterning and introduced ligand-pair treatment (LPT) to recover the PLQY. The LPT process re-passivated exchanged chloride ligands, increasing the PLQY of patterned QD films by over two-fold. Our study demonstrates a simple but effective approach for patterning InP-based colloidal nanomaterials.