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  • 1
    Digitale Medien
    Digitale Medien
    Type conversion, contacts, and surface effects in electroplated CdTe films (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 58 (1985), S. 3809-3813 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Efficient electroplated CdS/CdTe solar cells can be fabricated by heat treating and type-converting the n-CdTe films deposited on CdS layers. In this paper, various mechanisms which may give rise to the conversion of electroplated CdTe films from n to p type are investigated. It is concluded that Cd-vacancy generation is the main mechanism of type conversion. Possible effects of oxygen on this mechanism are also discussed. Evaporated Au contacts to electroplated p-CdTe films were studied. It was found that the Au contacts depleted the excess Te present on the surface of Br2-methanol etched p-CdTe films. Oxygen was found to affect the electrical characteristics of such contacts.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.335595
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  • 2
    Digitale Medien
    Digitale Medien
    Observation of lossless radiative modes of a dielectric sphere (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 86 (1999), S. 3694-3698 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: A theoretical investigation of plane-wave electromagnetic scattering in active dielectric sphere predicted the existence of anomalous resonances that occur at discrete wavelengths. These resonances may be understood from a leaky wave phase matching boundary conditions, in which the gain in the dielectric exactly makes up for the radiative loss of a mode. This results in a radiative mode that does not decay in time, therefore it is described as a lossless radiative mode. Experiments have been performed to verify the existence of these resonances. Optical pumping was used to provide the gain, and the threshold of each resonant mode was found to be a function of the dye concentration and the radius of the dielectric sphere. © 1999 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.371280
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  • 3
    Digitale Medien
    Digitale Medien
    Observation of self poling in BaTiO3 thin films (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 6690-6694 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The dependence of ferroelectric properties of sol-gel derived BaTiO3 thin (0.35 μm) films on various Si substrates was investigated. It was found that only films deposited on p+ Si (1020 cm−3 B, 2% Ge) are (110) oriented and possess a few percent of the spontaneous polarization of single-crystal BaTiO3. The direction of polarization self restored after being reversed by external bias or heated above the Curie temperature. It was found that the pyroelectric coefficient was not zero above the Curie point, which indicated that the films are permanently subjected to an electric field, which originates from the contact potential between the film and the substrate. This conclusion was confirmed by surface photovoltage spectroscopy. Orientation of the films was attributed to the presence of Ge in the substrate, which decreased lattice mismatch between the (100) vector of the Si substrate and (110) vector of BaTiO3. The possibility of a paraelectric to ferroelectric transition driven by an electric field due to the contact potential difference must be taken into account for dynamic random access memory applications. © 1999 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.370180
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