Photo-induced lattice distortion in 2H-MoTe<sub>2</sub> probed by time-resolved core level photoemission

Costantini, Roberto; Cilento, Federico; Salvador, Federico; Morgante, A.; Giorgi, Giacomo; Palummo, Maurizia; Dell’Angela, Martina

doi:10.1039/d1fd00105a

Cited by 5 publications

(2 citation statements)

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“…A photoinduced lattice distortion has been reported in 2H-MoTe 2 using time-resolved photoemission spectroscopy together with DFT calculations. 264 Based on the results, the lattice deformation induced by photoexcited electrons can be responsible for the light-induced phase transition in 2D materials.…”

Section: Phase Patterning Via Laser and E-beam Irradiationmentioning

confidence: 93%

Phase Engineering of 2D Materials

Kim,

Pandey,

Jeong

et al. 2023

Chem. Rev.

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Polymorphic 2D materials allow structural and electronic phase engineering, which can be used to realize energy-efficient, cost-effective, and scalable device applications. The phase engineering covers not only conventional structural and metal−insulator transitions but also magnetic states, strongly correlated band structures, and topological phases in rich 2D materials. The methods used for the local phase engineering of 2D materials include various optical, geometrical, and chemical processes as well as traditional thermodynamic approaches. In this Review, we survey the precise manipulation of local phases and phase patterning of 2D materials, particularly with ideal and versatile phase interfaces for electronic and energy device applications. Polymorphic 2D materials and diverse quantum materials with their layered, vertical, and lateral geometries are discussed with an emphasis on the role and use of their phase interfaces. Various phase interfaces have demonstrated superior and unique performance in electronic and energy devices. The phase patterning leads to novel homo-and heterojunction structures of 2D materials with low-dimensional phase boundaries, which highlights their potential for technological breakthroughs in future electronic, quantum, and energy devices. Accordingly, we encourage researchers to investigate and exploit phase patterning in emerging 2D materials.

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Section: Phase Patterning Via Laser and E-beam Irradiationmentioning

confidence: 93%

Phase Engineering of 2D Materials

Kim,

Pandey,

Jeong

et al. 2023

Chem. Rev.

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show abstract

“…In order to define the optimal conditions for the time-resolved measurements, fluence dependent XPS spectra were acquired with the laser and synchrotron beams impinging on the sample at normal incidence in a quasi-collinear geometry, and the photoemission signal was acquired using multibunch radiation. This acquisition method shows both the irreversible modifications of the line shapes due to laser irradiation and the long-lived photo-induced effects averaged in the time elapsed between consecutive laser pulses [45] which is ∼8 µs in these measurements (128 kHz repetition rate). The laser was focused to a spot diameter of ∼300 µm, slightly larger than the synchrotron beam on the sample surface.…”

Section: Methodsmentioning

confidence: 99%

Pump-Probe X-ray Photoemission Spectroscopy of Free-Standing Graphane

et al. 2023

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Free-standing nanoporous graphene was hydrogenated at about 60 at.% H uptake, as determined by the emerging of the sp3 bonding component in the C 1s core level investigated by high-resolution X-ray photoelectron spectroscopy (XPS). Fully unsupported graphane was investigated by XPS under optical excitation at 2.4 eV. At a laser fluence of 1.6 mJ/cm2, a partial irreversible dehydrogenation of the graphane was observed, which could be attributed either to the local temperature increase or to a photo-induced softening of the H-to-C stretching mode. The sub-ns dynamics of the energy shift and peak broadening of the C 1s core level revealed two different decay constants: 210 ps and 130 ps, respectively, the former associated with photovoltage dynamics and the latter with thermal heating on a time scale comparable with the synchrotron temporal resolution.

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Controlled laser-induced dehydrogenation of free-standing graphane probed by pump–probe X-ray photoemission

Costantini,

Giampietri,

Marchiani

et al. 2024

Applied Surface Science

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Photo-induced lattice distortion in 2H-MoTe₂ probed by time-resolved core level photoemission

Abstract: The technological interest in MoTe2 as a phase engineered material is related to the possibility of triggering the 2H-1T’ phase transition by optical excitation, potentially allowing for an accurate patterning...

Cited by 5 publications

References 44 publications

Phase Engineering of 2D Materials

Phase Engineering of 2D Materials

Pump-Probe X-ray Photoemission Spectroscopy of Free-Standing Graphane

Controlled laser-induced dehydrogenation of free-standing graphane probed by pump–probe X-ray photoemission

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Photo-induced lattice distortion in 2H-MoTe2 probed by time-resolved core level photoemission

Abstract: The technological interest in MoTe2 as a phase engineered material is related to the possibility of triggering the 2H-1T’ phase transition by optical excitation, potentially allowing for an accurate patterning...

Cited by 5 publications

References 44 publications

Phase Engineering of 2D Materials

Phase Engineering of 2D Materials

Pump-Probe X-ray Photoemission Spectroscopy of Free-Standing Graphane

Controlled laser-induced dehydrogenation of free-standing graphane probed by pump–probe X-ray photoemission

Contact Info

Product

Resources

About

Photo-induced lattice distortion in 2H-MoTe₂ probed by time-resolved core level photoemission