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Inhomogeneity of Cl...
Inhomogeneity of Cleaved Bulk MoS2 and Compensation of Its Charge Imbalances by Room-Temperature Hydrogen Treatment
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- Giangrisostomi, Erika (författare)
- Helmholtz Zent Berlin, Inst Methods & Instrumentat Synchrotron Radiat Res, Albert Einstein Str 15, D-12489 Berlin, Germany.
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- Ovsyannikov, Ruslan (författare)
- Helmholtz Zent Berlin, Inst Methods & Instrumentat Synchrotron Radiat Res, Albert Einstein Str 15, D-12489 Berlin, Germany.
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- Haverkamp, Robert (författare)
- Helmholtz Zent Berlin, Inst Methods & Instrumentat Synchrotron Radiat Res, Albert Einstein Str 15, D-12489 Berlin, Germany.;Univ Potsdam, Inst Phys & Astron, Karl Liebknecht Str 24-25, D-14476 Potsdam, Germany.
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- Sorgenfrei, Nomi L. A. N. (författare)
- Helmholtz Zent Berlin, Inst Methods & Instrumentat Synchrotron Radiat Res, Albert Einstein Str 15, D-12489 Berlin, Germany.;Univ Potsdam, Inst Phys & Astron, Karl Liebknecht Str 24-25, D-14476 Potsdam, Germany.
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- Neppl, Stefan (författare)
- Univ Potsdam, Inst Phys & Astron, Karl Liebknecht Str 24-25, D-14476 Potsdam, Germany.;Paul Scherrer Inst, Villigen, Switzerland.
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- Sezen, Hikmet (författare)
- Helmholtz Zent Berlin, Inst Methods & Instrumentat Synchrotron Radiat Res, Albert Einstein Str 15, D-12489 Berlin, Germany.;Tech Univ Darmstadt, Darmstadt, Germany.
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- Johansson, Fredrik (författare)
- Helmholtz Zent Berlin, Inst Methods & Instrumentat Synchrotron Radiat Res, Albert Einstein Str 15, D-12489 Berlin, Germany.;Univ Potsdam, Inst Phys & Astron, Karl Liebknecht Str 24-25, D-14476 Potsdam, Germany.;Sorbonne Univ, Paris, France.;Royal Inst Technol, Stockholm, Sweden.
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- Svensson, Svante, 1947- (författare)
- Uppsala universitet,Kemisk och biomolekylär fysik
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- Fohlisch, Alexander (författare)
- Helmholtz Zent Berlin, Inst Methods & Instrumentat Synchrotron Radiat Res, Albert Einstein Str 15, D-12489 Berlin, Germany.;Univ Potsdam, Inst Phys & Astron, Karl Liebknecht Str 24-25, D-14476 Potsdam, Germany.
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Helmholtz Zent Berlin, Inst Methods & Instrumentat Synchrotron Radiat Res, Albert Einstein Str 15, D-12489 Berlin, Germany Helmholtz Zent Berlin, Inst Methods & Instrumentat Synchrotron Radiat Res, Albert Einstein Str 15, D-12489 Berlin, Germany.;Univ Potsdam, Inst Phys & Astron, Karl Liebknecht Str 24-25, D-14476 Potsdam, Germany. (creator_code:org_t)
- Wiley, 2023
- 2023
- Engelska.
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Ingår i: Advanced Materials Interfaces. - : Wiley. - 2196-7350.
- Relaterad länk:
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https://doi.org/10.1...
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https://uu.diva-port... (primary) (Raw object)
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- Synthetic single crystals of bulk molybdenum disulphide cleaved in ultrahigh vacuum are mapped across a large (approximate to 25 mm(2)) area by X-ray photoelectron spectroscopy, both statically and transiently following above-bandgap excitation by an ultrafast laser. This work finds that: I) A cleaved surface typically displays spatially inhomogeneous properties, manifested by large (approximate to 1 eV) variations in binding energy and band bending and variable degrees of stability of those over time as a result of variable gas uptakes from the residual atmosphere. II) Moderate (350 degrees C) annealing and exposure to molecular hydrogen can be cycled to switch between smaller and larger surface band bending, the switch being reversible but strongly sample-position dependent. III) Upon exposure to atomic hydrogen, the binding energy of the entire surface levels out to a common (within <0.05 eV) value corresponding to a Fermi level pinned close to mid-bandgap. Such remarkable effect is attributed to the ability of hydrogen atoms to serve as donors and acceptors alike, thus neutralizing local charge imbalances inevitably present at the surface in consequence of intrinsic and/or cleavage-induced defects. With subsequent moderate annealing, the hydrogenated surface preserves a fairly homogenous electronic state which is however characterized by a lower binding energy and little to no band bending.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Kemiteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Chemical Engineering (hsv//eng)
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
Nyckelord
- molybdenum disulphide
- sample inhomogeneity
- hydrogen adsorption
- surface passivation
- transition metal dichalcogenides
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- art (ämneskategori)
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