| 초록 |
Metal chalcogenide nanomaterials have been of great interest as new light absorber replacing conventional Ru/organic dyes because of their unique properties. Among them, the PbS QDs is an ideal sensitizer because of their large Bohr radius of 18 nm and low bulk energy band gap of ~0.41 eV. Generally, the PbS QD-sensitized solar cells (QD-SSCs) are fabricated by depositing the colloidal PbS QDs with long alkyl ligands into multiple layers. Therefore, the capping ligands should be replaced to short ligands to improve the charge transfer/transport. In terms of charge extraction, the direct formation of PbS QDs on mesoscopic TiO2 is more desirable. Here, we formed the PbS QDs on mesoscopic TiO2 by spin-assisted successive precipitation and anion exchange reaction (spin-SPAER) method and further improved their efficiency by introduction of hybrid perovskite passivation layer. |
