Electronic Coupling in Metallophthalocyanine-Transition Metal Dichalcogenide Mixed-Dimensional Heterojunctions

Samuel H. Amsterdam, Teodor K. Stanev, Qunfei Zhou, Alexander J.T. Lou, Hadallia Bergeron, Pierre Darancet, Mark C Hersam, Nathaniel P. Stern, Tobin J Marks

Research output: Contribution to journalArticle

1 Citation (Scopus)

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 2 heterojunctions using optical absorption and Raman spectroscopy to elucidate M core (M = first row transition metal), MoS 2 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 2 layer number, ultimately reaching a maximum enhancement factor of 30x relative to SiO 2 substrates. These experimental results, combined with density functional theory (DFT) calculations, indicate strong coupling between nonfrontier MPc orbitals and the MoS 2 band structure as well as charge transfer across the heterojunction interface that varies as a function of the MPc electronic structure.

Original languageEnglish
JournalACS Nano
DOIs
Publication statusPublished - Jan 1 2019

Fingerprint

Transition metals
Heterojunctions
heterojunctions
transition metals
electronics
Light absorption
Charge transfer
augmentation
optical absorption
charge transfer
Wavelength
Laser excitation
Electron transitions
Absorption spectroscopy
wavelengths
Band structure
excitation
Electronic structure
Density functional theory
Raman spectroscopy

Keywords

  • charge transfer
  • heterojunction
  • metallophthalocyanine
  • phthalocyanine
  • transition metal dichalcogenide

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

Cite this

Electronic Coupling in Metallophthalocyanine-Transition Metal Dichalcogenide Mixed-Dimensional Heterojunctions. / Amsterdam, Samuel H.; Stanev, Teodor K.; Zhou, Qunfei; Lou, Alexander J.T.; Bergeron, Hadallia; Darancet, Pierre; Hersam, Mark C; Stern, Nathaniel P.; Marks, Tobin J.

In: ACS Nano, 01.01.2019.

Research output: Contribution to journalArticle

Amsterdam, Samuel H. ; Stanev, Teodor K. ; Zhou, Qunfei ; Lou, Alexander J.T. ; Bergeron, Hadallia ; Darancet, Pierre ; Hersam, Mark C ; Stern, Nathaniel P. ; Marks, Tobin J. / Electronic Coupling in Metallophthalocyanine-Transition Metal Dichalcogenide Mixed-Dimensional Heterojunctions. In: ACS Nano. 2019.
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