A bismuth triiodide monosheet on Bi2Se3(0001)

Polyakov, A.; Mohseni, K.; Castro, Germán R.; Rubio-Zuazo, J.; Zeugner, Alexander; Isaeva, Anna; Chen, Ying-Jiun; Tusche, Christian; Meyerheim, H. L.

doi:10.1038/s41598-019-40506-9

Cited by 4 publications

(2 citation statements)

References 31 publications

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“…Computational studies indicate that exfoliation should be well achievable and that BiI 3 monolayers and heterostructures with graphene or SbI 3 show promising properties with regard to photovoltaics or photocatalytic water splitting. − Indeed, recent studies demonstrated the application of BiI 3 nanocrystals as photodetectors , and pressure sensors and showed that van der Waals heterostructures with graphene or WSe 2 can be fabricated. However, observation of mono- and few-layer BiI 3 sheets has remained rare and is often restricted to the nanometer size regime, , which underlines the need for simple preparation methods of sufficiently large starting crystals to obtain large flakes by exfoliation. Another important aspect is the chemical stability of the exfoliated surfaces or films at ambient conditions.…”

Section: Introductionmentioning

confidence: 99%

Chemical Surface Reactivity and Morphological Changes of Bismuth Triiodide (BiI₃) under Different Environmental Conditions

et al. 2020

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Layered metal halides like BiI 3 are of current interest in connection with both 2D materials and photovoltaics.Here, we present a facile new method for the preparation of millimeter-sized BiI 3 single crystals. We use these crystals to study the surface reactivity of their (001) cleavage planes toward various environmental conditions by measuring morphological changes using atomic force microscopy and analyzing the formed species by means of X-ray photoelectron spectroscopy and X-ray diffraction methods. We find that freshly cleaved samples show atomically flat surface regions extending over several micrometers and reveal steps corresponding to single BiI 3 layers. However, we also find that the surface deteriorates in air on a time scale of hours. By studying samples cleaved and stored under different conditions, we identify water as the agent initiating the changes in surface morphology, while under inert gas and dry oxygen, the surface stays intact. On the basis of the analysis of deteriorated long-term-stored samples we identify BiOI as the main product of hydrolysis. We also observe a second long-term decomposition route for samples stored under dynamic vacuum, where formation of BiI whiskers occurs. Overall, our findings emphasize the challenges associated with the surface reactivity of BiI 3 but also demonstrate that well-ordered BiI 3 surfaces can be obtained, which indicates that preparation of extended, atomically smooth BiI 3 monolayers by exfoliation from bulk crystals should be possible.

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Section: Introductionmentioning

confidence: 99%

Chemical Surface Reactivity and Morphological Changes of Bismuth Triiodide (BiI₃) under Different Environmental Conditions

et al. 2020

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“…Impressive results have been obtained with double-HSA type instruments using lab sources [1,13,[55][56][57] and Synchrotron radiation at ELETTRA, Trieste [58][59][60][61]. Spin-resolved band mapping using the ToF-MM approach has been performed in the UV using fs-laser radiation [62], in the VUV [63][64][65][66][67] at BESSY, Berlin, in the soft-X-ray range [68] and very recently using hard X-rays [69] at PETRA III, Hamburg.…”

Section: Introductionmentioning

confidence: 99%

Single-Hemisphere Photoelectron Momentum Microscope With Time-of-Flight Recording

Schoenhense,

Babenkov,

Vasilyev

et al. 2020

Preprint

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Photoelectron momentum microscopy is an emerging powerful method for angle-resolved photoelectron spectroscopy (ARPES), especially in combination with imaging spin filters. These instruments record kx-ky images, typically exceeding a full Brillouin zone. As energy filters doublehemispherical or time-of-flight (ToF) devices are in use. Here we present a new approach for momentum mapping of the full half-space, based on a large single hemispherical analyzer (path radius 225 mm). Excitation by an unfocused He lamp yielded an energy resolution of 7.7 meV. The performance is demonstrated by k-imaging of quantum-well states in Au and Xe multilayers. The  2aberration term (: entrance angle in the dispersive plane) and the transit-time spread of the electrons in the spherical field are studied in a large pass-energy (6 to 660 eV) and angular range ( up to  7°). It is discussed how the method circumvents the preconditions of previous theoretical work on the resolution limitation due to the  2 -term and the transit-time spread, being detrimental for timeresolved experiments. Thanks to k-resolved detection, both effects can be corrected numerically. We introduce a dispersive-plus-ToF hybrid mode of operation, with an imaging ToF analyzer behind the exit slit of the hemisphere. This instrument captures 3D data arrays I (EB,kx,ky), yielding a gain up to N 2 in recording efficiency (N being the number of resolved time slices). A key application will be ARPES at sources with high pulse rates like Synchrotrons with 500 MHz time structure.

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Solution-grown BiI/BiI3 van der Waals heterostructures for sensitive X-ray detection

et al. 2023

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X-ray detectors must be operated at minimal doses to reduce radiation health risks during X-ray security examination or medical inspection, therefore requiring high sensitivity and low detection limits. Although organolead trihalide perovskites have rapidly emerged as promising candidates for X-ray detection due to their low cost and remarkable performance, these materials threaten the safety of the human body and environment due to the presence of lead. Here we present the realization of highly sensitive X-ray detectors based on an environmentally friendly solution-grown thick BiI/BiI3/BiI (BixIy) van der Waals heterostructure. The devices exhibit anisotropic X-ray detection response with a sensitivity up to 4.3 × 104 μC Gy−1 cm−2 and a detection limit as low as 34 nGy s−1. At the same time, our BixIy detectors demonstrate high environmental and hard radiation stabilities. Our work motivates the search for new van der Waals heterostructure classes to realize high-performance X-ray detectors and other optoelectronic devices without employing toxic elements.

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A bismuth triiodide monosheet on Bi2Se3(0001)

Cited by 4 publications

References 31 publications

Chemical Surface Reactivity and Morphological Changes of Bismuth Triiodide (BiI₃) under Different Environmental Conditions

Chemical Surface Reactivity and Morphological Changes of Bismuth Triiodide (BiI₃) under Different Environmental Conditions

Single-Hemisphere Photoelectron Momentum Microscope With Time-of-Flight Recording

Solution-grown BiI/BiI3 van der Waals heterostructures for sensitive X-ray detection

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A bismuth triiodide monosheet on Bi2Se3(0001)

Cited by 4 publications

References 31 publications

Chemical Surface Reactivity and Morphological Changes of Bismuth Triiodide (BiI3) under Different Environmental Conditions

Chemical Surface Reactivity and Morphological Changes of Bismuth Triiodide (BiI3) under Different Environmental Conditions

Single-Hemisphere Photoelectron Momentum Microscope With Time-of-Flight Recording

Solution-grown BiI/BiI3 van der Waals heterostructures for sensitive X-ray detection

Contact Info

Product

Resources

About

Chemical Surface Reactivity and Morphological Changes of Bismuth Triiodide (BiI₃) under Different Environmental Conditions

Chemical Surface Reactivity and Morphological Changes of Bismuth Triiodide (BiI₃) under Different Environmental Conditions