Solution-Processed Two-Dimensional Ultrathin InSe Nanosheets

Lauth, Jannika; Gorris, Friederieke E. S.; Khoshkhoo, M. Samadi; Chassé, Thomas; Friedrich, Wiebke; Lebedeva, Vera; Meyer, Andreas; Klinke, Christian; Kornowski, Andreas; Scheele, Marcus; Weller, Horst

doi:10.1021/acs.chemmater.5b04646

Cited by 115 publications

(122 citation statements)

References 54 publications

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“…InSe is a van der Waals layered bulk semiconductor with highly promising photodetecting properties and FET mobilities of up to 1000 cm methods, atomically thin mono/double layers of InSe can be obtained (inorganic layer thickness 0.8-1.7 nm, ≤ 5 nm including ligands), a thickness hardly accessible by exfoliation methods [16]. Figure 1a shows a TEM image of multiple stacked InSe layers separated from each other by their stabilizing ligand decylamine.…”

Section: Colloidal Ultrathin Inse Nanosheetsmentioning

confidence: 99%

Ultrafast Transient Absorption and Terahertz Spectroscopy as Tools to Probe Photoexcited States and Dynamics in Colloidal 2D Nanostructures

Lauth

Kinge

Siebbeles

2016

Zeitschrift Für Physikalische Chemie

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Two-dimensional (2D) semiconductors hold high potential for the implementation of efficient ultrathin electronics (e.g. field-effect transistors, light emitting diodes and solar cell devices). In recent years, colloidal methods to synthesize ultrathin 2D materials have been developed that offer alternatives (like the production of non-layered 2D materials and upscaling) to mechanical exfoliation methods. By focusing on optoelectronic applications, it is important to characterize the nature and dynamics of photoexcited states in these materials. In this paper, we use ultrafast transient absorption (TA) and terahertz (THz) spectroscopy as optimal tools for such a characterization. We choose recently synthesized ultrathin colloidal 2D InSe nanosheets (inorganic layer thickness 0.8-1.7 nm; ≤ 5 nm including ligands) for discussing TA and THz spectroscopic studies and elucidate their charge carrier dynamics under photoexcitation with TA. THz spectroscopy is then used to extract contactless AC mobilities as high as 20 ± 2 cm 2 /Vs in single InSe layers. The obtained results underpin the general applicability of TA and THz spectroscopy for characterizing photoexcited states in 2D semiconductors.

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Section: Colloidal Ultrathin Inse Nanosheetsmentioning

confidence: 99%

Ultrafast Transient Absorption and Terahertz Spectroscopy as Tools to Probe Photoexcited States and Dynamics in Colloidal 2D Nanostructures

Lauth

Kinge

Siebbeles

2016

Zeitschrift Für Physikalische Chemie

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“…31 If the thickness is in direction and the lateral growth is along the [0001] and [11][12][13][14][15][16][17][18][19][20] axis, the calculated XRD shows sharp (002) and (110) peaks with increased intensity, while the (100) peak is broadened and less intense.…”

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confidence: 99%

Size, Shape, and Phase Control in Ultrathin CdSe Nanosheets

Gerdes¹,

Navío

Juárez

et al. 2017

Nano Lett.

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Ultrathin two-dimensional nanosheets raise a rapidly increasing interest due to their unique dimensionality-dependent properties. Most of the two-dimensional materials are obtained by exfoliation of layered bulk materials or are grown on substrates by vapor deposition methods. To produce free-standing nanosheets, solution-based colloidal methods are emerging as promising routes. In this work, we demonstrate ultrathin CdSe nanosheets with controllable size, shape and phase. The key of our approach is the use of halogenated alkanes as additives in a hot-injection synthesis. Increasing concentrations of bromoalkanes can tune the shape from sexangular to quadrangular to triangular and the phase from zinc blende to wurtzite. Geometry and crystal structure evolution of the nanosheets take place in the presence of halide ions, acting as cadmium complexing agents and as surface X-type ligands, according to mass spectrometry and X-ray photoelectron spectroscopies. Our experimental findings show that the degree of these changes depends on the molecular structure of the halogen alkanes and the type of halogen atom.Comment: 24 pages, 6 figure

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“…In consistent with the above, J. Lauth et. al [7] reported experimentally that ultrathin InSe layers exhibits a broad absorption peak in the visible region at around 560 nm (~ 2.2 eV). Hence InSe and Te doped InSe monolayer could absorb a significant amount of solar light.…”

Section: Resultsmentioning

confidence: 99%

Te doped indium (II) selenide photocatalyst for water splitting: A first principles study

Kishore¹,

Ravindran²

2017

AIP Conference Proceedings

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Abstract. Graphene like 2D materials have attracted tremendous attention in the field of photocatalytic water splitting. Indium Selenide (InSe) is one such potential material. Here, we report the effect of Tellurium on InSe monolayer for the photocatalytic water splitting by means of density functional calculations. The calculated bandgaps fall within the visible region of the solar spectrum indicating these materials could absorb a significant amount of solar light. Density of states calculations show that the covalent character is present between the atoms which is typical for the layered system. The band alignment with respect to redox potentials show that Te doped InSe is more favorable for the hydrogen reduction reaction than the pristine InSe monolayer. Our overall results show that Te substitution improves the photocatalytic water splitting ability in InSe monolayer.

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Solution-Processed Two-Dimensional Ultrathin InSe Nanosheets

Cited by 115 publications

References 54 publications

Ultrafast Transient Absorption and Terahertz Spectroscopy as Tools to Probe Photoexcited States and Dynamics in Colloidal 2D Nanostructures

Ultrafast Transient Absorption and Terahertz Spectroscopy as Tools to Probe Photoexcited States and Dynamics in Colloidal 2D Nanostructures

Size, Shape, and Phase Control in Ultrathin CdSe Nanosheets

Te doped indium (II) selenide photocatalyst for water splitting: A first principles study

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