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EMR Spectra Thin Films Doped with High Concentration of Co and Cr on Quartz and Sapphire Substrates

100%
Cieniek B., Stefaniuk I., Virt I.
Acta Physica Polonica A
|
2017
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vol. 132
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issue 1
30-34
EN
We have studied magnetic properties of zinc-oxide composite doped with high concentration (up to 20%) of Co and Cr ions. The pulsed laser deposition method was used to obtain samples on quartz glass and sapphire substrates. Samples were annealed at 100-250°C for ZnO on quartz substrate, and 300-700°C on sapphire substrate. EMR measurements were carried out and temperature dependence of the EMR spectra was obtained. The angular dependence in two samples orientation, vertical and horizontal, were also obtained. Analysis of the temperature dependences of the integral intensity of EMR spectra was carried out using the Curie-Weiss law.
2
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Effect of adsorbed Sn on Ge diffusivity on Si(111) surface

100%
Dolbak A., Olshanetsky B.
Open Physics
|
2008
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vol. 6
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issue 3
634-637
EN
The effect of adsorbed Sn as a surfactant on Ge diffusion on a Si(111) surface has been studied by Low Energy Electron Diffraction and Auger Electron Spectroscopy. The experimental dependence of Ge diffusion coefficients on the Si(111) surface versus temperature in the presence of adsorbed Sn atoms has been measured in the range from 300 to 650°C. It has been shown that at a Sn coverage of about 1 monolayer the mobility of Ge atoms increases by several orders of magnitude.
3
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Passivation of defect states in surface and edge regions on pn-junction Si solar cells by use of hydrogen cyanide solutions

84%
Takahashi M., Shishido T., Iwasa H., Kobayashi H.
Open Physics
|
2009
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vol. 7
|
issue 2
227-231
EN
The local photovoltage of the pn-junction single-crystalline silicon solar cells observed by spot light scanning gradually decreases in the vicinity of edges. The energy conversion efficiency is increased by shadowing the edge regions where the local photovoltage is lower, showing that the defect density is high in the edge regions. From the analysis of the local photovoltage, the spacial distribution of defect states is obtained. The cyanide method, i. e., immersion of solar cells in HCN solutions at room temperature, increases the local photovoltage and increases the energy conversion efficiency.
4
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STM investigation of cobalt silicide nanostructures’ growth on Si(111)-(√19 Ã- √19) substrate

84%
Cegiel M., Bazarnik M., Czajka R.
Open Physics
|
2009
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vol. 7
|
issue 2
291-294
EN
Continuing miniaturization of electronic devices necessarily requires assembly of several different objects or devices in a small space. Therefore, besides thin films growth, the possibility of fabricating wires and dots [1, 2] at the nanometre scale composed of metal silicides is of the top interest. This report is about the STM/STS investigation of cobalt silicides’ nanostructures created on Si(111)-(√19 Ã- √19) substrates via Co evaporation and post deposition annealing. This (√19 Ã- √19) reconstruction was induced by Ni doping. Less than 1ML of Co on surface was obtained. Surface reconstruction induced growth of agglomerates of clusters rather than an uniform layer. The post deposition annealing of a crystal sample (up to 670 K, 770 K, 870 K, 970 K, 1070 K and 1170 K) led to creation of silicides’ nanostructures. Measurements showed that coalescence of Co nanoislands begun around 970 K. Annealing above 1070 K led to alloying of a Co, Ni and Si. As a consequence the Si(111)-(7Ã-7) reconstruction occurred at the cost of Si(111)-(√19 Ã- √19).
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