| 초록 |
Lead halide perovskite(LHP) nanocrystals(NCs) have recently emerged as a promising active material due to their interesting properties, easy synthesis, and solvent processability for thin film fabrication. Despite the merits of LHP NCs, the inherent instability of PNCs in the presence of O2 and H2O at high temperature makes their practical applications difficult. Surface ligand determines the size, shape, and crystal properties of LHP NCs. Oleic acid(OA) and oleylamine(OLAm) are commonly used in NC synthesis. Their hydrophobic long alkyl groups are suitable for NC synthesis in non-polar organic solvent. However, LHP NCs with OA, OLAm exhibit relatively poor crystal properties such as light absorption and charge transport compared to unprotected polycrystalline films. In this study, other types of surface ligand with stronger chelating strength was used in preparing LHP NCs. Other synthetic conditions were also adjusted to improve stability and crystal properties of the prepared NCs. |
