Electronic Coupling in Metallophthalocyanine-Transition Metal Dichalcogenide Mixed-Dimensional Heterojunctions.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 30848891.
- Also identified by DOI 10.1021/acsnano.8b09166.
- No licence information is recorded for this record.
- Because redistribution is not established, this page shows the abstract only. Follow the links below for the full text.
Abstract
Mixed-dimensional heterojunctions, such as zero-dimensional (0D) organic molecules deposited on two-dimensional (2D) transition metal dichalcogenides (TMDCs), often exhibit interfacial effects that enhance the properties of the individual constituent layers. Here we report a systematic study of interfacial charge transfer in metallophthalocyanine (MPc) - MoS<sub>2</sub> heterojunctions using optical absorption and Raman spectroscopy to elucidate M core (M = first row transition metal), MoS<sub>2</sub> layer number, and excitation wavelength effects. Observed phenomena include the emergence of heterojunction-specific optical absorption transitions and strong Raman enhancement that depends on the M identity. In addition, the Raman enhancement is tunable by excitation laser wavelength and MoS<sub>2</sub> layer number, ultimately reaching a maximum enhancement factor of 30x relative to SiO<sub>2</sub> substrates. These experimental results, combined with density functional theory (DFT) calculations, indicate strong coupling between nonfrontier MPc orbitals and the MoS<sub>2</sub> band structure as well as charge transfer across the heterojunction interface that varies as a function of the MPc electronic structure.