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Structural and optical characterization of annealed As30Te60Ga10 thin films prepared by thermal evaporation technique

Abd-Elnaiem A. M., Mohamed M., Hassan R. M., Abdel-Rahim M. A., Abu-Sehly A. A., Hafiz M. M.

Materials Science Poland

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2018

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Vol. 36, No. 2

193--202

EN

Effect of annealing temperature on the structural and optical properties of As30Te60Ga10 thin film was studied using various techniques such as differential scanning calorimetry (DSC), X-ray diffraction (XRD) and scanning electron microscopy (SEM). The DSC analysis revealed that the As30Te60Ga10 glass has a single glass transition and crystallization peak while XRD results confirmed that the as-prepared and annealed films have crystalline nature. The coexistence of the crystalline phases in the investigated films could be attributed to the formation of orthorhombic As, hexagonal Ga7Te10, and monoclinic As2Te3 phases. It was found that the average crystallite size and optical parameters of the studied films depend on the annealing temperature. For example, the optical band gap decreased from 1.54 eV to 1.11 eV as the annealing temperature increased from 300 K to 433 K.

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Nadprzewodnictwo w półprzewodnikach

Sosnowski J.

Przegląd Techniczny : Gazeta Inżynierska

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2017

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nr 7-8

18--22

PL

W pracy omówiono odkrycia z zakresu występowania nadprzewodnictwa w półprzewodnikach. Materiały te łącząc specyficzne właściwości tych dwóch klas – nadprzewodników i półprzewodników – stwarzają nowe możliwości ich zastosowania, w tym przy konstrukcji przyrządów elektronicznych. Przedstawiono pierwsze, wcześniejsze rezultaty badań półprzewodników nadprzewodzących, w tym przeprowadzone przez autora na selenku lantanu oraz wyniki nowych badań prowadzących do odkrycia nadprzewodników żelazowych, które także oparte są na lantanie i selenie.

EN

In the paper are discussed discoveries from range of occurrence superconductivity in semiconductors. These materials connecting peculiar specificities in these two classes – superconductors and semiconductors bring new capabilities of their applications at construction of electronic instruments. In paper are presented first, earlier results of research of superconducting semiconductors, including carried by author of publication on lanthanum selenide and then results of new research leading to discovery of iron-superconductors, which are also based on lanthanum and selenide.

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The Quasi-ternary CdSe–Ga2Se3–Sb2Se3 System

Sosovska S., Olekseyuk I., Parasyuk O.

Polish Journal of Chemistry

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2007

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Vol. 81, nr 4

505-513

EN

Differential thermal analysis, X-ray diffraction, and metallography were used to study the interaction between the components of the quasi-ternary CdSe–Ga2Se3–Sb2Se3 system. Phase diagrams of three vertical sections, an isothermal section at 670K, aswell as a projection of the liquidus surface have been constructed. The type of mono- and invariant processes in the system has been investigated and the coordinates of invariant points have been determined. Present results can be employed for the growth of CdGa2Se4 single crystals from non-stoichiometric melts.

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Fotoindukowane zjawiska nieliniowooptyczne w szkłach.

Golis E.P.

Szkło i Ceramika

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1999

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R. 50, nr 3

7-9