The Polymer Society of Korea

정현준 (성균관대학교)

정소희 (성균관대학교)

Colloidal quantum dots (QDs), with size-tunable bandgaps enabled by quantum confinement and low-cost, flexible fabrication through solution-processability, are promising for infrared applications such as LiDAR and interactive displays. In particular, InAs QDs are actively explored as RoHS-compliant materials in response to environmental concerns. However, they suffer from abundant trap states due to fractional dangling bonds and limited surface binding sites. To address this, various ligand-based passivation strategies have been studied. In this work, we adopt a core/shell approach for trap passivation in InAs QDs. While thick shells or long-chain ligands hinder charge transport by increasing inter-dot spacing, our thin-shell structure passivates traps while maintaining efficient charge transport. Using these InAs core/thin-shell QDs, we fabricated infrared photodetectors with significantly suppressed dark current and enhanced performance.