@article{07725c9eb4da49e3a50779dc8f1ab7d5,
title = "Electronic Coupling in Metallophthalocyanine-Transition Metal Dichalcogenide Mixed-Dimensional Heterojunctions",
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. ",
keywords = "charge transfer, heterojunction, metallophthalocyanine, phthalocyanine, transition metal dichalcogenide",
author = "Amsterdam, {Samuel H.} and Stanev, {Teodor K.} and Qunfei Zhou and Lou, {Alexander J.T.} and Hadallia Bergeron and Pierre Darancet and Hersam, {Mark C.} and Stern, {Nathaniel P.} and Marks, {Tobin J.}",
note = "Funding Information: This work was primarily supported by the National Science Foundation Materials Research Science and Engineering Center at Northwestern University (DMR-1720319). This work made use of the Keck-II facility of the Northwestern University NUANCE Center, which has received support from the SHyNE Resource (NSF ECCS-1542205); the MRSEC program (NSF DMR-1720139) at the Materials Research Center; the International Institute for Nanotechnology (IIN); and the Keck Foundation. S.H.A. and A.J.-T.L. acknowledge support from the Department of Defense (DoD) through the National Defense Science & Engineering Graduate Fellowship (NDSEG) Program, and S.H.A., the Patrick G. and Shirley W. Ryan Foundation. CVD growth of MoS2 was supported by the National Institute of Standards and Technology (NIST CHiMaD 70NANB14H012). Raman instrumentation was funded by the Center for Light Energy Activated Redox Processes (DOE DE-SC0001059). H.B. acknowledges support from the NSERC Postgraduate Scholarship-Doctoral Program and a National Science Foundation Graduate Research Fellowship. Use of the Center for Nanoscale Materials, an Office of Science user facility, was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. Computational resources were provided by the Quest High Performance Computing Cluster from Northwestern University. Publisher Copyright: {\textcopyright} 2019 American Chemical Society.",
year = "2019",
month = apr,
day = "23",
doi = "10.1021/acsnano.8b09166",
language = "English (US)",
volume = "13",
pages = "4183--4190",
journal = "ACS Nano",
issn = "1936-0851",
publisher = "American Chemical Society",
number = "4",
}