ESD of nonthermal halogen atoms from In-doped (001) KBr

Postawa, Zbigniew; Kołodziej, Jacek; Baran, Grzegorz; Czuba, P.; Piątkowski, P.; Szymoński, Marek; Plavina, I.; Попов, А. И.

doi:10.1016/0168-583x(94)00826-4

Cited by 12 publications

(4 citation statements)

References 17 publications

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“…20 However, further experiments have shown that the nonthermal component is not significantly dependent on the current density, 22 and on the concentration of impurities in the lattice. 32 In this section we demonstrate that this weak temperature dependence can be satisfactorily explained by the interaction of hot excitation carriers ͑excitons͒ with the polar lattice and that invoking of other concepts is not required.…”

Section: Dependence Of Nonthermal Desorption On Temperaturementioning

confidence: 72%

Hot-carrier transport processes in stimulated desorption of alkali halides

Kołodziej

Szymoński

1998

Phys. Rev. B

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Electron-and photon-stimulated desorption of epitaxial thin films and bulk single crystals of alkali halides has been investigated. It has been found that the widely accepted model based on self-trapped exiton decay and thermally activated defect diffusion cannot account for a number of experimental observations. In particular, it cannot explain the stability of the very thin alkali-halide films against the electron beam, and it fails to interpret correctly the yield dependence of the halogen atoms emitted with nonthermal energies on the film thickness and sample temperature. It is shown that for satisfactory interpretation of those data one has to take into account early stages of crystal excitation, i.e., hot carrier formation and transport processes occurring prior to self-trapped exciton phase. Consequently, a comprehensive description of the observed desorption features is presented.

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Section: Dependence Of Nonthermal Desorption On Temperaturementioning

confidence: 72%

Hot-carrier transport processes in stimulated desorption of alkali halides

Kołodziej

Szymoński

1998

Phys. Rev. B

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“…Their diffusion-controlled decay has been observed by different experimental techniques in almost all alkali halides, as well as in some other binary halides, but also in complex halides, such as perovskite halides, ammonium halides, halide sodalites etc. [8,11,12,15,23,25,26 ] In this paper, we review and analyse the STH migration temperatures for a series of alkali halides as a function of halogen-halogen (X-X) distance in a regular crystalline lattice as well as the bond length in isolated X2molecular ions.…”

Section: Introductionmentioning

confidence: 99%

Analysis of self-trapped hole mobility in alkali halides and metal halides

2017

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The small radius hole polarons (self-trapped holes (STH) known also as the Vk centres) are very common color centers observed in alkali halides and alkaline-earth halides. Their mobility controls the rate of secondary reactions between electron and hole defects and thus radiation stability/sensitivity of materials. We have analysed here the correlation between the temperatures at which hole polarons start migration in a series of alkali halides (fluorites, chlorides, bromides, iodides) and the lattice displacement around X2quasi-molecule. These results are especially important for identification of the selftrapped holes, for example, in novel scintillating materials such as SrI2, as well as in a large family of perovskite halides and more complex halide materials.

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“…PeQDs, a typical electron beam-sensitive material exposed to hundreds to thousands of electrons, would break down after being focused onto the microscopy and then arise radiation defects [17]. At present, the effect of low-energy electrons on the crystal surface properties has been reported, but the influence of electron beams on the crystal structure of PeQDs has not been studied [18,19]. As a result, the quality and reliability of reported imaging results are frequently questioned.…”

Section: Introductionmentioning

confidence: 99%

Transmission Electron Microscopy Peeled Surface Defect of Perovskite Quantum Dots to Improve Crystal Structure

Yuan,

Zhou,

Jin

et al. 2023

Materials

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Transmission electron microscopy (TEM) is an excellent characterization method to analyze the size, morphology, crystalline state, and microstructure of perovskite quantum dots (PeQDs). Nevertheless, the electron beam of TEM as an illumination source provides high energy, which causes morphological variation (fusion and melting) and recession of the crystalline structure in low radiolysis tolerance specimens. Hence, a novel and facile strategy is proposed: electron beam peel [PbBr6]4− octahedron defects from the surface of QDs to optimize the crystal structure. TEM and high-angle annular dark-field scanning TEM (HAADF) tests indicate that the [PbBr6]4− octahedron would be peeled from the surface of QDs when QDs samples were irradiated under high-power irradiation, and then a clear image would be obtained. To avoid interference from a protective film of “carbon deposits” on the surface of the sample when using high resolution TEM, amorphous carbon film (15–20 nm) was deposited on the surface of QDs film and then characterized by TEM and HAADF. The detection consequences showed that the defection of PbBr2 on the surface of QDs will gradually disappear with the extension of radiation time, which further verifies the conjecture.

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ESD of nonthermal halogen atoms from In-doped (001) KBr

Cited by 12 publications

References 17 publications

Hot-carrier transport processes in stimulated desorption of alkali halides

Hot-carrier transport processes in stimulated desorption of alkali halides

Analysis of self-trapped hole mobility in alkali halides and metal halides

Transmission Electron Microscopy Peeled Surface Defect of Perovskite Quantum Dots to Improve Crystal Structure

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