Formation of lead bromide-based layered perovskite monolayer having organic–inorganic quantum-well structure at air–water interface

Era, Masanao; Higashiuchi, Tomoko; Yaso, Koji; Kuramori, Miyuki; Oishi, Yushi

doi:10.1016/j.tsf.2005.06.067

Cited by 13 publications

(15 citation statements)

References 6 publications

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“…Owing to the low-dimensional semiconductor structure, they form a stable exciton with a large binding energy and exhibit attractive optical characteristics due to the stable exciton such as efficient photoluminescence, electroluminescence and optical nonlinearity. [4][5][6][7][8][9][10][11][12] It has been reported [13][14][15] that ultrathin films of the lead bromide-based layered perovskite can be prepared by the Langmuir-Blodgett method. One of these reports speculated the formation mechanism of perovskite structure using reflection spectra of monolayer on the water surface and an atomic force microscope (AFM) image of transferred film.…”

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confidence: 99%

“…One of these reports speculated the formation mechanism of perovskite structure using reflection spectra of monolayer on the water surface and an atomic force microscope (AFM) image of transferred film. 15 The formation mechanism of layered perovskites by compression of monolayers on the water surface should be evidently known to achieve an ultimate properties of the system owing to a better control on the organization of molecules in the ultrathin film. However, the layered structure and the formation mechanism of perovskite monoalyer are now unclear, although the periodicity of a multi-deposited perovskite film on substrate was evaluated by X-ray diffraction.…”

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confidence: 99%

“…The origin and method of reflection measurements have been described in elsewhere. 15 The monolayer was transferred onto a freshly cleaved mica by the horizontal drawing-up method 16 and a silicone plate by the vertical drawing-up method for AFM observations and X-ray reflectivity measurements, respectively. An AFM image of the monolayer was obtained with a SPA300 unit together with a SPI Images were recorded at a scan rate of 2 Hz in constant force mode (utilizing feed-back to keep the cantilever at constant deflection and measuring sample motion).…”

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confidence: 99%

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Formation of Layered Perovskite Structure by Folding Monolayer During Compression

Arita¹,

Hiramatsu²,

Narita³

et al. 2012

j nanosci nanotechnol

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The morphology and layered structure of an alkyl ammonium bromide ultrathin film prepared on an aqueous solution of lead bromide were investigated on the basis of surface pressure-area curve measurements, reflection spectrum measurements, X-ray reflectivity measurements and atomic force microscopic observations. It became apparent that the layered structure sandwiched a two-dimensional inorganic layer between two organic monolayers was formed by folding the monolayer by compression on an aqueous PbBr2 solution.

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Formation of Layered Perovskite Structure by Folding Monolayer During Compression

Arita¹,

Hiramatsu²,

Narita³

et al. 2012

j nanosci nanotechnol

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“…Based on the above arguments, it seems to be very tempting to combine π-conjugated photoswitchable compounds of the azobenzene type with hybrid perovskites and incorporate them as a conductive phase. There are a few publications on 2D layered hybrid perovskites (LHPs) containing azobenzene [21,39,40]. Here, the cation used serves only as structuring chromophore but not as an electronic part of the materials.…”

Section: Introductionmentioning

confidence: 99%

Interfacial charge transfer processes in 2D and 3D semiconducting hybrid perovskites: azobenzene as photoswitchable ligand

Fillafer¹,

Seewald²,

Schmidt‐Mende³

et al. 2020

Beilstein J. Nanotechnol.

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In the vast majority of studies on semiconductor particles ligands or capping agents are used that bind to the surface of the particles covering them with an electrically insulating shell. Since the transport of charge carriers and/or energy across interfaces is desirable for a variety of applications, the use of π-conjugated ligands becomes increasingly interesting. Among them are compounds that react to external stimuli. Molecular switches in particular are fascinating because the properties of the interfaces can be potentially adjusted as required. However, there is debate about how the properties of such special ligands are influenced by the presence of a semiconductor and vice versa. Here ammonium-modified azobenzene compounds were selected as prototypes for molecular switches and organic–inorganic hybrid perovskites as semiconductor materials. The class of ammonium–lead–halide phases as prototypes is peculiar because, in addition to the surface functionalization of 3D crystals, organic compounds can actually be incorporated into the crystal as 2D phases. Thus, for example, layered Ruddlesden–Popper phases are obtained. We present photoswitchable azobenzene ligands with different head-group lengths for the synthesis of 2D and 3D hybrid perovskite phases. The energy transfer mechanisms are influenced by the length of the molecular spacer moiety, which determines the distance between the π system and the semiconductor surfaces. We find huge differences in the photoswitching behaviour between the free, surface-coordinated and integrated ligands between the perovskite layers. Photoswitching of azobenzene ligands incorporated in 2D phases is nearly quenched, while the same mechanism for surface-coordinating ligands is greatly improved, compared to the free ligands. The improvement originates from an energy transfer from perovskite to azobenzene, which is strongly distance-dependent. This study provides evidence for the photoswitching of azobenzenes as ligands of hybrid perovskites, which depends on the spacing between the chromophore and the perovskite phase.

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“…Some papers exist on 2D layered hybrid perovskites (LHP) containing azobenzene. [16,[33][34] Here the applied cation serves only as structuring chromophore but not as an electronical compound of the materials.…”

Section: Introductionmentioning

confidence: 99%

Interfacial Charge Transfer Processes in 2D and 3D Semiconducting Hybrid Perovskites: Azobenzene as Photoswitchable Ligand

Fillafer¹,

Seewald²,

Schmidt‐Mende³

et al. 2019

Preprint

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<p>In the vast majority of studies on semiconductor particles one uses ligands, respectively capping agents, which bind to the external surfaces of the particles and cover it with an electrically insulating shell. Since transport of charge carrier and/ or energy across interfaces is desirable for a large number of applications, the use of pi-conjugated ligands becomes more and more interesting. Among those, compounds which show stimuli-responsive properties, particularly molecular switches are fascinating, as one hopes to be able to adjust the properties of the interfaces by demand. However, how the properties of such special ligands get influenced by the presence of a semiconductor and vice-versa is under debate. Here, ammonium-modified azobenzene compounds were selected as prototypes for molecular switches and organic-inorganic hybrid perovskites on the semiconductor side. The class of ammonium-lead-halide phases as prototypes is special, because in addition to surface functionalization of 3D crystals, organic compounds can be truly incorporated into the crystal as 2D phases yielding, for example, layered Ruddelsden-Popper phases. We present photoswitchable azobenzene ligands with varying head group lengths for the synthesis of 2D and 3D hybrid perovskite phases. Energy transfer mechanisms are influenced by the length of the molecular spacer moiety, which determines the distance between the pi-system to the semiconductor surfaces. We find huge differences in the photoswitching behaviour between the free, surface coordinated versus ligands integrated inside perovskite layers. Photoswitching of azobenzene ligands incorporated to 2D phases is nearly quenched, while the same mechanism for coordinating ligands is greatly improved, compared to the free ligands. The improvement originates from an energy transfer from the perovskite to the azobenzene, which is strongly distance dependent. This study provides evidence for the photoswitching behaviour of azobenzene as ligand for hybrid perovskites and the dependence of the head group between a chromophore and the perovskite phase.</p>

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Formation of lead bromide-based layered perovskite monolayer having organic–inorganic quantum-well structure at air–water interface

Cited by 13 publications

References 6 publications

Formation of Layered Perovskite Structure by Folding Monolayer During Compression

Formation of Layered Perovskite Structure by Folding Monolayer During Compression

Interfacial charge transfer processes in 2D and 3D semiconducting hybrid perovskites: azobenzene as photoswitchable ligand

Interfacial Charge Transfer Processes in 2D and 3D Semiconducting Hybrid Perovskites: Azobenzene as Photoswitchable Ligand

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