Surface Ligand Effects on the Intaglio Transfer Printing Process of Quantum Dots
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초록
내용
Display devices demand high-resolution patterns of semiconductor nanocrystal quantum dots (QDs). Dry transfer printing of QDs holds promise because of preservation of inherent properties of QDs. However, the impact of surface ligands remains inadequately comprehended. In this study, we delve into the effect of surface ligands on the intaglio transfer printing process using colloidal QDs covered with organic (C8–C18) or inorganic (I−) ligands. QDs with long-chain ligands (C18) exhibit an impressive patterning yield of approximately 100%. The patterning yield diminishes as the chain length decreases for organic ligand passivated QDs. We propose two failure mechanisms: (i) Inorganic ligand passivated QDs exhibit poor adhesion, leading to ineffective pickup, and (ii) QDs with shorter organic ligands are susceptible to internal crack formation, due to the weak interparticle attraction among the QDs. Our discoveries offer valuable insights, enabling the preparation of high-resolution QD patterns.