Solvation Shifts the Band-Edge Position of Colloidal Quantum Dots by Nearly 1 eV.

ABSTRACT: The optoelectronic properties of colloidal quantum dots (cQDs) depend critically on the absolute energy of the conduction and valence band edges. It is well known these band-edge energies are sensitive to the ligands on the cQD surface, but it is much less clear how they depend on other experimental conditions, like solvation. Here, we experimentally determine the band-edge positions of thin films of PbS and ZnO cQDs via spectroelectrochemical measurements. To achieve this, we first carefully evaluate and optimize the electrochemical injection of electrons and holes into PbS cQDs. This results in electrochemically fully reversible electron injection with >8 electrons per PbS cQDs, allowing the quantitative determination of the conduction band energy for PbS cQDs with various diameters and

SUBMITTER: Vogel YB 

PROVIDER: S-EPMC11009959 | biostudies-literature | 2024 Apr

REPOSITORIES: biostudies-literature