Investigation of epitaxial growth via high-resolution helium atom scattering: potassium bromide onto rubidium chloride (001)

Safron, S. A.; Duan, Jingxian; Bishop, G. G.; Gillman, Edward; Skofronick, J. G.

doi:10.1021/j100111a008

Cited by 25 publications

(12 citation statements)

References 12 publications

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“…In our treatment of the Fröhlich interaction we choose to use the strong coupling polaron approximation, since the formation of bipolarons requires large values of the electronphonon coupling constant so as to sustain the phononmediated binding and withstand against the strong repulsive Coulomb interaction. Fortunately, the adiabatic theory we follow is motivated by the recent advances in producing nanocrystals with strong ionic coupling [33][34][35]. Moreover, the pseudo-enhancement of the electron phonon coupling in confined media is an additional complement supporting the applicability of the strong coupling theory.…”

Section: Introductionmentioning

confidence: 99%

Strong-coupling theory of two dimensional large bipolarons in elliptical quantum dots

Senger

Erçelebi

2002

Eur. Phys. J. B

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Abstract. In the limit of strong electron-phonon coupling, we analyze the stability of two dimensional bipolarons in a two-axis elliptic potential well of harmonic boundaries. The confined two-polaron wavefunction adopted here makes the electrons to form either a bipolaronic bound state or go into a composite state of two separated polarons bounded inside the same potential well. The methodology involves the mean polaron-polaron separation treated as an adjustable parameter to be determined variationally. By tuning the barrier slopes of the confining potential we obtain an explicit tracking of the criterion for bipolaron stability encompassing the particular cases of a two dimensional circular dot or a planar strip-like quantum well wire. We observe that, while an increased degree of confinement enhances bipolaronic stability, the effect of anisotropy is to inhibit bipolaron formation.

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Section: Introductionmentioning

confidence: 99%

Strong-coupling theory of two dimensional large bipolarons in elliptical quantum dots

Senger

Erçelebi

2002

Eur. Phys. J. B

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“…Although significant progress has been made in studying RHEED oscillations in epitaxial growth on metals24252627 and semiconductors28293031, there are no reports on halide insulators. Hetero- and homoepitaxial growths of alkali halides using molecular beam epitaxy (MBE) have been studied by both electron and He atom scattering, however with a limited growth parameter range in ultrahigh vacuum32333435363738. In the case of the studies with RHEED in MBE, electron beams had to be removed within seconds to avoid charging, therefore limiting the ability to monitor oscillations and to obtain real time growth mode information.…”

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confidence: 99%

Homoepitaxial Growth of Metal Halide Crystals Investigated by Reflection High-Energy Electron Diffraction

Chen

Kuttipillai

Wang

et al. 2017

Sci Rep

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We report the homoepitaxial growth of a metal halide on single crystals investigated with in situ reflection high-energy electron diffraction (RHEED) and ex situ atomic force microscopy (AFM). Epitaxial growth of NaCl on NaCl (001) is explored as a function of temperature and growth rate which provides the first detailed report of RHEED oscillations for metal halide growth. Layer-by-layer growth is observed at room temperature accompanied by clear RHEED oscillations while the growth mode transitions to an island (3D) mode at low temperature. At higher temperatures (>100 °C), RHEED oscillations and AFM data indicate a transition to a step-flow growth mode. To show the importance of such metal halide growth, green organic light-emitting diodes (OLEDs) are demonstrated using a doped NaCl film with a phosphorescent emitter as the emissive layer. This study demonstrates the ability to perform in situ and non-destructive RHEED monitoring even on insulating substrates and could enable doped single crystals and crystalline substrates for a range of optoelectronic applications.

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“…This was closely followed by a study of the heteroepitaxial growth for the KBr/NaCl system, which has a large lattice mismatch ͑17%͒ and preliminary work for the KBr/ RbCl͑001͒ system, which has a very small mismatch ͑0.12%͒. 17,18 In both cases, the materials have face-centered cubic ͑fcc͒ lattices with the rocksalt structure. In the work reported here, the KBr/RbCl system is studied in much greater detail than in the previous work.…”

Section: Introductionmentioning

confidence: 94%

“…2 is typical for twodimensional layer-by-layer growth. 11,16,17,30,32 Before the deposition begins, the specular beam sees few defects or adsorbates and is at 75 arbitrary units on the ordinate scale of Fig. 2.…”

Section: A Deposition Curvesmentioning

confidence: 99%

Lattice dynamics of ultrathin layers of KBr grown epitaxially on RbCl(001)

et al. 1996

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High-resolution helium-atom scattering experiments were performed on epitaxially grown layers of KBr on a RbCl͑001͒ substrate for films 1, 2, and 3 ML thick. The layer-by-layer growth was monitored in situ by measuring the intensity of the specularly scattered He beam versus coverage. Measurements of the singlephonon inelastic scattering were carried out on each succeeding layer to determine the surface-phonon dispersion in both the ⌫M and ⌫X high-symmetry directions of the surface Brillouin zone. Shell-model potential parameters were determined in a consistent fashion for the four anion-cation constituents at the interface, which gave a good fit to the dispersion curve data from 1-, 2-, and 3-ML KBr/RbCl epitaxially grown systems as reported in this study and, in addition, the bulk and clean surface dispersions of KBr, RbCl, KCl, and RbBr were fit by the same parameters.

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Investigation of epitaxial growth via high-resolution helium atom scattering: potassium bromide onto rubidium chloride (001)

Cited by 25 publications

References 12 publications

Strong-coupling theory of two dimensional large bipolarons in elliptical quantum dots

Strong-coupling theory of two dimensional large bipolarons in elliptical quantum dots

Homoepitaxial Growth of Metal Halide Crystals Investigated by Reflection High-Energy Electron Diffraction

Lattice dynamics of ultrathin layers of KBr grown epitaxially on RbCl(001)

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