@article{7e28e25d46d6474490cbfc22d08fa9ff,
title = "Photophysics and Electronic Structure of Lateral Graphene/MoS2and Metal/MoS2Junctions",
abstract = "Integration of semiconducting transition metal dichalcogenides (TMDs) into functional optoelectronic circuitries requires an understanding of the charge transfer across the interface between the TMD and the contacting material. Here, we use spatially resolved photocurrent microscopy to demonstrate electronic uniformity at the epitaxial graphene/molybdenum disulfide (EG/MoS2) interface. A 10× larger photocurrent is extracted at the EG/MoS2 interface when compared to the metal (Ti/Au)/MoS2 interface. This is supported by semi-local density functional theory (DFT), which predicts the Schottky barrier at the EG/MoS2 interface to be {\^a}2× lower than that at Ti/MoS2. We provide a direct visualization of a 2D material Schottky barrier through combination of angle-resolved photoemission spectroscopy with spatial resolution selected to be {\^a}300 nm (nano-ARPES) and DFT calculations. A bending of {\^a}500 meV over a length scale of {\^a}2-3 μm in the valence band maximum of MoS2 is observed via nano-ARPES. We explicate a correlation between experimental demonstration and theoretical predictions of barriers at graphene/TMD interfaces. Spatially resolved photocurrent mapping allows for directly visualizing the uniformity of built-in electric fields at heterostructure interfaces, providing a guide for microscopic engineering of charge transport across heterointerfaces. This simple probe-based technique also speaks directly to the 2D synthesis community to elucidate electronic uniformity at domain boundaries alongside morphological uniformity over large areas. ",
author = "Shruti Subramanian and Campbell, {Quinn T.} and Moser, {Simon K.} and Jonas Kiemle and Philipp Zimmermann and Paul Seifert and Florian Sigger and Deeksha Sharma and Hala Al-Sadeg and Michael Labella and Dacen Waters and Feenstra, {Randall M.} and Koch, {Roland J.} and Chris Jozwiak and Aaron Bostwick and Eli Rotenberg and Ismaila Dabo and Holleitner, {Alexander W.} and Beechem, {Thomas E.} and Ursula Wurstbauer and Robinson, {Joshua A.}",
note = "Funding Information: S.S. and J.A.R. acknowledge funding from NSF CAREER (Award: 1453924). S.K.M. acknowledges support by the Swiss National Science Foundation (Grant No. P300P2-171221). This research used resources of the Advanced Light Source, which is a DOE Office of Science User Facility under Contract No. DE-AC02-05CH11231. P.S. acknowledges financial support from the Alexander von Humboldt foundation and the German federal ministry of education and research within the Feodor Lynen program. D.S. acknowledges funding from the National Science Foundation via Award Number EFMA 1433378 and EFMA 1433307. H.A.-S. was supported by the EXPEC Advanced Research Center, Petroleum Engineering and Development Department at Saudi Aramco. D.W. and R.M.F.{\textquoteright}s contribution was supported in part by the Center for Low Energy Systems Technology (LEAST), one of six centers of STARnet, a Semiconductor Research Corporation program sponsored by MARCO and DARPA. I.D. acknowledges financial support from the National Science Foundation under Grant No. DMREF-1729338. U.W. was funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany{\textquoteright}s Excellence Strategy - EXC 2089/1-390776260. This work was performed, in part, at the Center for Integrated Nanotechnologies, an Office of Science User Facility operated for the U.S. Department of Energy (DOE) Office of Science. Sandia National Laboratories is a multimission laboratory managed and operated by National Technology & Engineering Solutions of Sandia, LLC, a wholly owned subsidiary of Honeywell International, Inc., for the U.S. DOE{\textquoteright}s National Nuclear Security Administration under contract DE-NA-0003525. The views expressed in the article do not necessarily represent the views of the U.S. DOE or the United States Government. Publisher Copyright: {\textcopyright} ",
year = "2020",
month = dec,
day = "22",
doi = "10.1021/acsnano.0c02527",
language = "English (US)",
volume = "14",
pages = "16663--16671",
journal = "ACS Nano",
issn = "1936-0851",
publisher = "American Chemical Society",
number = "12",
}