Journal
ACS NANO
Volume 13, Issue 4, Pages 4183-4190Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.8b09166
Keywords
heterojunction; transition metal dichalcogenide; metallophthalocyanine; phthalocyanine; charge transfer
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Funding
- National Science Foundation Materials Research Science and Engineering Center at Northwestern University [DMR-1720319]
- SHyNE Resource [NSF ECCS-1542205]
- MRSEC program at the Materials Research Center [NSF DMR-1720139]
- International Institute for Nanotechnology (IIN)
- Keck Foundation
- Department of Defense (DoD) through the National Defense Science & Engineering Graduate Fellowship (NDSEG) Program
- Patrick G. and Shirley W. Ryan Foundation
- National Institute of Standards and Technology [NIST CHiMaD 70NANB14H012]
- Center for Light Energy Activated Redox Processes [DOE DE-SC0001059]
- NSERC Postgraduate Scholarship - Doctoral Program
- National Science Foundation Graduate Research Fellowship
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
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Mixed-dimensional heterojunctions, such as zero-dimensional (OD) 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) - MoS2 heterojunctions using optical absorption and Raman spectroscopy to elucidate M core (M = first row transition metal), MoS2 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 MoS2 layer number, ultimately reaching a maximum enhancement factor of 30x relative to SiO2 substrates. These experimental results, combined with density functional theory (DFT) calculations, indicate strong coupling between nonfrontier MPc orbitals and the MoS2 band structure as well as charge transfer across the heterojunction interface that varies as a function of the MPc electronic structure.
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