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Strain compensation in Si1−xGex by heavy boron doping (1995)

Tillack, B. ; Zaumseil, P. ; Morgenstern, G. ; [et al.]

Woodbury, NY : American Institute of Physics (AIP)

Applied Physics Letters 67 (1995), S. 1143-1144

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ISSN: 1077-3118

Source: AIP Digital Archive

Topics: Physics

Notes: Strain compensation in SiGe by heavy boron doping was demonstrated. For this purpose, SiGe layers containing up to several percent of boron were deposited using rapid thermal chemical vapor deposition. The strain compensation effect was evaluated by double crystal x-ray diffraction measuring the difference between the diffraction peak distances of the boron doped samples and a reference sample without boron which can be directly related to the decrease of the lattice constant in Si1−x−yGexBy due to the incorporation of boron. The films were characterized by cross-sectional transmission electron microscopy (XTEM), Auger electron spectroscopy (AES), and secondary ion mass spectroscopy (SIMS). © 1995 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.114988

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Photochemical Reactions of Triplet Methylene Blue with arene diazonium salts relative efficiency of the oxidation and the reduction mechanismsHerrn Prof. Dr. Dr. K. Schreiber zum 60. Geburtstag gewidmet (1986)

Becker, H. G. O. ; Schütz, R. ; Tillack, B. ; [et al.]

New York, NY : Wiley-Blackwell

Journal für Praktische Chemie/Chemiker-Zeitung 328 (1986), S. 661-672

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ISSN: 0021-8383

Keywords: Chemistry ; Organic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: Rate constants and efficiencies of the oxidative bleaching of triplet-excited methylene blue by different arene diazonium salts are determined by flash photolysis and stationary experiments.In the same way the rate constants of methylene blue photoreductions by diazabicylo[2,2,2]-octane (DABCO), sodium tetraphenyl borate (TPB), sodium ethylenediamine tetraacetate (EDTA), and allyl thiourea (ATU) are determined.According to these results TPB reduces methylene blue photochemically not exceedingly fast (ke = 1.5 × 107M-1s-1) but with a high efficiency (η = 0.8).At high diazonium salt concentrations (10-1 - 10-2 M), the oxidation and the reduction mechanisms of the triplet-methylene-blue sensitized dediazoniation of arene diazonium salts have similar efficiencies at high as well as at low light intensities.At low diazonium salt concentrations and with diazonium salts of low reactivity, the reduction mechanism is favoured over the oxidation mechanism.

Additional Material: 6 Ill.