Evaluation of TEM methods for their signature of the number of layers in mono- and few-layer TMDs as exemplified by MoS2 and MoTe2

Köster, Janis; Storm, Alexander; Gorelik, Tatiana E.; Mohn, Michael J.; Port, Fabian; Gonçalves, Manuel R.; Kaiser, Ute

doi:10.1016/j.micron.2022.103303

Cited by 6 publications

(5 citation statements)

References 92 publications

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“…77−79 The thicknesses of the emerging annealed crystals were obtained from EELS by the log-ratio method. 80,81 For annealing experiments, a side entry Double Tilt Heating Holder Model 652-Ta (Gatan Inc.) and a FEI NanoEx-i/v TEM holder were used (www.fei.com/nanoex). The transition temperature for the annealing experiments was measured directly from the FEI TEM holder under vacuum conditions (7 × 10 −9 bar).…”

Section: Materials and Instrumentationmentioning

confidence: 99%

“…The energy resolution in the EELS experiments was determined to be 0.6 eV from the full width at half-maximum of the zero-loss peak, measured under vacuum. If not stated otherwise in the corresponding spectra, for all presented core-loss EELS signals, the background was treated with a power-law model, which has been shown to give good results in previous studies of the analyzed elemental core-loss edges. − The thicknesses of the emerging annealed crystals were obtained from EELS by the log-ratio method. , …”

Section: Materials and Instrumentationmentioning

confidence: 99%

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Electron-Beam- and Thermal-Annealing-Induced Structural Transformations in Few-Layer MnPS₃

et al. 2023

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Quasi-two-dimensional (2D) manganese phosphorus trisulfide, MnPS 3 , which exhibits antiferromagnetic ordering, is a particularly interesting material in the context of magnetism in a system with reduced dimensionality and its potential technological applications. Here, we present an experimental and theoretical study on modifying the properties of freestanding MnPS 3 by local structural transformations via electron irradiation in a transmission electron microscope and by thermal annealing under vacuum. In both cases we find that MnS 1−x P x phases (0 ≤ x < 1) form in a crystal structure different from that of the host material, namely that of the αor γ-MnS type. These phase transformations can both be locally controlled by the size of the electron beam as well as by the total applied electron dose and simultaneously imaged at the atomic scale. For the MnS structures generated in this process, our ab initio calculations indicate that their electronic and magnetic properties strongly depend on both in-plane crystallite orientation and thickness. Moreover, the electronic properties of the MnS phases can be further tuned by alloying with phosphorus. Therefore, our results show that electron beam irradiation and thermal annealing can be utilized to grow phases with distinct properties starting from freestanding quasi-2D MnPS 3 .

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Section: Materials and Instrumentationmentioning

confidence: 99%

Section: Materials and Instrumentationmentioning

confidence: 99%

Electron-Beam- and Thermal-Annealing-Induced Structural Transformations in Few-Layer MnPS₃

et al. 2023

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“…Experimentally determined image parameters were used as input parameters, and noise following the Poisson statistics was added to the images to account for the finite electron dose. Due to the utilized magnification during the acquisition, no effects of the camera MTF have to be included in the simulations …”

Section: Methodsmentioning

confidence: 99%

“…Due to the utilized magnification during the acquisition, no effects of the camera MTF have to be included in the simulations. 75 2.3. Computational Details.…”

Section: Tem Experiments and Analysismentioning

confidence: 99%

Structural Transformations in Few-Layer MnPSe₃ Stimulated by Thermal Annealing and Electron Irradiation

Storm,

Köster,

Ghorbani-Asl

et al. 2023

J. Phys. Chem. C

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“…The discussed peak separation, evaluated from the defect statistics in a single plan-view HRTEM image, allows to identify the number of layers in the sample. As explained in, 41 without exploiting the defect statistics only monolayer MoS 2 can be identified.…”

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Defect Density and Atomic Defect Recognition in the Middle Layer of a Trilayer MoS₂ Stack

Quincke,

Mundszinger,

Biskupek

et al. 2024

Nano Lett.

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Molybdenum disulfide (MoS 2 ) is one of the most intriguing two-dimensional materials, and moreover, its single atomic defects can significantly alter the properties. These defects can be both imaged and engineered using spherical and chromatic aberration-corrected high-resolution transmission electron microscopy (C C /C S -corrected HRTEM). In a few-layer stack, several atoms are vertically aligned in one atomic column. Therefore, it is challenging to determine the positions of missing atoms and the damage cross-section, particularly in the not directly accessible middle layers. In this study, we introduce a technique for extracting subtle intensity differences in C C /C S -corrected HRTEM images. By exploiting the crystal structure of the material, our method discerns chalcogen vacancies even in the middle layer of trilayer MoS 2 . We found that in trilayer MoS 2 the middle layer's damage cross-section is about ten times lower than that in the monolayer. Our findings could be essential for the application of few-layer MoS 2 in nanodevices.

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Evaluation of TEM methods for their signature of the number of layers in mono- and few-layer TMDs as exemplified by MoS2 and MoTe2

Cited by 6 publications

References 92 publications

Electron-Beam- and Thermal-Annealing-Induced Structural Transformations in Few-Layer MnPS₃

Electron-Beam- and Thermal-Annealing-Induced Structural Transformations in Few-Layer MnPS₃

Structural Transformations in Few-Layer MnPSe₃ Stimulated by Thermal Annealing and Electron Irradiation

Defect Density and Atomic Defect Recognition in the Middle Layer of a Trilayer MoS₂ Stack

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Evaluation of TEM methods for their signature of the number of layers in mono- and few-layer TMDs as exemplified by MoS2 and MoTe2

Cited by 6 publications

References 92 publications

Electron-Beam- and Thermal-Annealing-Induced Structural Transformations in Few-Layer MnPS3

Electron-Beam- and Thermal-Annealing-Induced Structural Transformations in Few-Layer MnPS3

Structural Transformations in Few-Layer MnPSe3 Stimulated by Thermal Annealing and Electron Irradiation

Defect Density and Atomic Defect Recognition in the Middle Layer of a Trilayer MoS2 Stack

Contact Info

Product

Resources

About

Electron-Beam- and Thermal-Annealing-Induced Structural Transformations in Few-Layer MnPS₃

Electron-Beam- and Thermal-Annealing-Induced Structural Transformations in Few-Layer MnPS₃

Structural Transformations in Few-Layer MnPSe₃ Stimulated by Thermal Annealing and Electron Irradiation

Defect Density and Atomic Defect Recognition in the Middle Layer of a Trilayer MoS₂ Stack