Molecular-Orientation-Dependent Interfacial Charge Transfer in Phthalocyanine/MoS2 Mixed-Dimensional Heterojunctions

Suyog Padgaonkar, Samuel H. Amsterdam, Hadallia Bergeron, Katherine Su, Tobin J Marks, Mark C Hersam, Emily A Weiss

Research output: Contribution to journalArticle

Abstract

Mixed-dimensional heterojunctions (MDHJs) combine the characteristics of component materials such as the discrete orbital energies of zero-dimensional (0D) molecules and the extended band structure of two-dimensional (2D) semiconductors. Here, time-resolved spectroscopy reveals sub-picosecond photoinduced hole-transfer and sub-320 fs photoinduced electron-transfer processes at the interfaces of type-II copper and free-base phthalocyanine/monolayer MoS2 MDHJs. In CuPc/MoS2 heterojunctions, charge separation lasts as long as 70 ns, which is a factor of 17 longer than that in H2Pc/MoS2 heterojunctions and a factor of 40 longer than that in previously reported transition-metal dichalcogenide-based heterojunctions. Preservation of the charge-separated state is attributed to the face-on orientation of CuPc on the MoS2 surface, which templates stacking of CuPc molecules and facilitates hole migration away from the interface, whereas H2Pc molecules adopt a mixed edge-on and face-on orientation. This work highlights the role of molecular structure in determining the interfacial geometry and, ultimately, charge-transfer dynamics in 0D/2D heterojunctions.

Original languageEnglish
Pages (from-to)13337-13343
Number of pages7
JournalJournal of Physical Chemistry C
Volume123
Issue number21
DOIs
Publication statusPublished - May 30 2019

Fingerprint

Molecular orientation
Heterojunctions
Charge transfer
heterojunctions
charge transfer
Molecules
molecules
polarization (charge separation)
Band structure
Molecular structure
Transition metals
phthalocyanine
Copper
Monolayers
electron transfer
molecular structure
templates
transition metals
Spectroscopy
Semiconductor materials

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

Cite this

Molecular-Orientation-Dependent Interfacial Charge Transfer in Phthalocyanine/MoS2 Mixed-Dimensional Heterojunctions. / Padgaonkar, Suyog; Amsterdam, Samuel H.; Bergeron, Hadallia; Su, Katherine; Marks, Tobin J; Hersam, Mark C; Weiss, Emily A.

In: Journal of Physical Chemistry C, Vol. 123, No. 21, 30.05.2019, p. 13337-13343.

Research output: Contribution to journalArticle

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