Band and subband absorption of Se/CdSe amorphous multilayers

Nesheva, D.; Arsova, D.; Levi, Z.

doi:10.1080/01418639408241801

Cited by 15 publications

(19 citation statements)

References 18 publications

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“…Metal/amorphous laminated composites have been fabricated in pursuit of enhanced mechanical and functional properties of amorphous layers in the recent years [84][85][86][87][88][89][90][97][98][99][100][140][141][142][143][144][145][146][147][148][149][150][151][152][153]. The amorphous layer involves metallic glasses [84][85][86][87][88][89][90][97][98][99][100][140][141][142][143][144][145], amorphous ceramics [146][147][148][149][150][151], and carbon or silicon family elemental glasses…”

Section: Shear Banding In Crystal-amorphous Laminatesmentioning

confidence: 99%

Strength and plasticity of nanolaminated materials

Wang

Zhou

Shao

et al. 2016

Materials Research Letters

226

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The mechanical behavior of nanolaminates is dominated by interfaces that act as sources, barriers, and preferred sites for storage and dynamic recovery of glide dislocations. In this article, the deformation mechanisms of a variety of metal-based nanolaminates are reviewed with emphasis on unusual mechanical properties such as ultra-high flow strength without loss of plastic deformability. IMPACT STATEMENT This paper reviews the current understanding of the mechanisms and mechanics of nanolaminated composites, and discusses the future direction in predicting the mechanical behavior of laminated composites.

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Section: Shear Banding In Crystal-amorphous Laminatesmentioning

confidence: 99%

Strength and plasticity of nanolaminated materials

Wang

Zhou

Shao

et al. 2016

Materials Research Letters

226

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“…The error was within ±0.015 eV. The blue-shift in our as-deposited AMLs can be connected with quantum-confinement effects [3,4]. Furthermore it is expected that with decreasing thickness of the "valley" layers, and/or with the appearance and growth of transition layers of mixed composition during interdiffusion, further ∆E g shift (0.05/0.1 eV) and further bleaching of the AML will be observed.…”

mentioning

confidence: 88%

“…Compositionally modulated multilayers are attractive for these purposes because of the rather simple technology and modeling of physical processes. Amorphous multilayers (AML) are of special interest due to the elimination of the misfit problems, but the explanation of some physical effects, for example quantum confinement, blue shift of the absorption edge, diffusion on nano-scale are rather indefinite up today [3,4]. Investigations of the well-known photo-stimulated structural transformations (PST) in amorphous chalcogenide semiconductor films [5,6] were extended to the nanolayered systems [4,7] and gave a new insight to the mechanism of light-stimulated structural transformations within sensitive amorphous sub-layers of AML.…”

mentioning

confidence: 99%

Stimulated structural transformations in amorphous semiconductor multilayers

Beke

Csík

Kökényesi

et al. 2003

phys. stat. sol. (c)

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PACS 42.70.Ln, 68.65.Ac Structural transformations, stimulated by illumination or heating are related to the interdiffusion processes in nanolayered structures, which were prepared by cyclic thermal evaporation or magnetron sputtering from Si, Ge, Se semiconductors and some As 2 S 3 , Se x Te 1-x -type chalcogenide glasses. It is shown that the intermixing velocity and the related changes of optical parameters depend on the period of the multilayer and intensity of illumination. Volume extension can be stimulated at the illuminated regions and used for the surface relief formation.Introduction The nano-scale technologies provide new possibilities of creating materials and devices with peculiar characteristics for micro-and optoelectronics. Stability of nanostructured systems strongly depends on the interdiffusion processes, which in turn can be used for solid-state synthesis of multicomponent materials, optical recording [1,2]. Compositionally modulated multilayers are attractive for these purposes because of the rather simple technology and modeling of physical processes. Amorphous multilayers (AML) are of special interest due to the elimination of the misfit problems, but the explanation of some physical effects, for example quantum confinement, blue shift of the absorption edge, diffusion on nano-scale are rather indefinite up today [3,4]. Investigations of the well-known photo-stimulated structural transformations (PST) in amorphous chalcogenide semiconductor films [5,6] were extended to the nanolayered systems [4,7] and gave a new insight to the mechanism of light-stimulated structural transformations within sensitive amorphous sub-layers of AML. Light-stimulated interdiffusion processes are possible in Si, Ge as well as in Se and chalcogenide-glass containing AML [8]. These can be used for amplitude-phase optical recording due to the changes of optical transmission, reflection and refraction index in the illuminated region of the AML. Surface reliefs also can be produced due to the deviation from Vegard's law in intermixed systems [1,8]. Stimulated intermixing depends on the temperature and the intensity of illumination, which also can heat up the layer. A model of surface relief formation due to the interdiffusion and the influence of illumination intensity on the amplitude recording process in three typical AMLs (a-Se/As 2 S 3 , As 6 Se 94 /Se 80 Te 20 , a-Si/Ge) are discussed in this paper.

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“…quantum confinement, diffusion) not well understood. [4][5][6] The structure, optical and electrical characteristics of amorphous Si and Ge layers are widely studied, 7 and e.g. our previous investigations on laser-induced structural transformations of amorphous Si/Ge multilayers resulted an interesting results.…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4][5] Besides the great amount of investigations on nanocomposites, compositionally modulated multilayers are attractive because of the welldeveloped microelectronic technology, rather simple modeling of physical processes and possible applications of thin film structures. Although the misfit problems in amorphous multilayers (AML) are considerably reduced as compared to crystalline superlattices, still there are some physical processes (e.g.…”

Section: Introductionmentioning

confidence: 99%

Laser-induced optical changes in amorphous multilayers

Malyovanik

Ivan

Csík

et al. 2003

Journal of Applied Physics

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It is shown that the well-known blue-shift of the fundamental absorption edge in as-deposited compositionally modulated amorphous Si/Ge and As 6 Se 94 /Se 80 Te 20 multilayers (with periods of 4-8 nm) is further enhanced due to the thermal or laser-induced intermixing of adjacent layers.The laser-induced intermixing process, as supported by experiments and model calculations, can be attributed to both the local heating and photo-effects in As 6 Se 94 /Se 80 Te 20 multilayers, while only the thermal effects were observed for Si/Ge multilayers. Structural transformations, based on this enhanced interdiffusion, provides good capability for spatially patterning optoelectronic devices and digital information recording. a) Corresponding author.

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Band and subband absorption of Se/CdSe amorphous multilayers

Cited by 15 publications

References 18 publications

Strength and plasticity of nanolaminated materials

Strength and plasticity of nanolaminated materials

Stimulated structural transformations in amorphous semiconductor multilayers

Laser-induced optical changes in amorphous multilayers

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