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Plasma-assisted CVD of fluorinated, hydrogenated amorphous silicon. Final technical report, September 15, 1979-September 15, 1980

Description: During the past year, approximately 300 large-area (400 cm/sup 2/) PIN hydrogenated amorphous silicon (a-Si:H) solar cells were fabricated and tested. a-Si:H PIN cells which were plasma deposited at 200/sup 0/ to 350/sup 0/ were found to have high internal currents (13mA/cm/sup 2/), whereas those which were deposited by CVD at 500/sup 0/ to 650/sup 0/C had low internal currents. When corrected for optical losses in the top electrode, the internal quantum efficiency vs wavelength for the PIN cel… more
Date: January 1, 1980
Creator: Coleman, J. H.; Hammes, J. P. & Wiesmann, H. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Bean Model and AC Losses in Bi{sub 2}Sr{sub 2}Ca{sub 2}Cu{sub 3}O{sub 10}/Ag Tapes

Description: The Bean model is almost solely used to interpret ac losses in the powder-in-tube processed composite conductor, Bi{sub 2}Sr{sub 2}Ca{sub 2}Cu{sub 3}O{sub 10}/Ag. In order to examine the limits of the applicability of the model, a detailed comparison was made between the values of critical current density J{sub c} for Bi(2223)/Ag tapes which were determined by standard four-probe-dc measurement, and which were deduced from the field dependence of the ac losses utilizing the model. A significant… more
Date: October 27, 1997
Creator: Suenaga, M.; Chiba, T.; Wiesmann, H. J. & Haldar, P.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Nucleation of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} in the BaF{sub 2} Process.

Description: The nucleation of the c-axis aligned and non-c-axis YBa{sub 2}Cu{sub 3}O{sub {approximately}6.1} (YBCO) from precursor films on [001]-cut SrTiO{sub 3} was investigated for the so-called BaF{sub 2} process. Specimens with different thickness were quenched from 735 C, then studied by transmission electron microscopy and x-ray diffraction techniques. Preceding the formation of YBCO nuclei, three intermediate phases of (Y,Ba) oxy-fluoride and a transition phase without F were found in the precursor… more
Date: June 24, 2001
Creator: Wu, L.; Solovyov, V. F.; Wiesmann, H. J.; Zhu, Y. & Suenaga, M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Ex-Situ Post-Deposition Processing for Large Area Y(1)BA(2)CU(3)O(7) Films and Coated Tapes

Description: Ex-situ post-deposition reaction processing is considered a promising alternative to in-situ physical vapor deposition techniques for coated Y{sub 1}Ba{sub 2}Cu{sub 3}O{sub 7} conductor development. It was reported recently, that attempts at ex-situ processing of long Y{sub 1}Ba{sub 2}Cu{sub 3}O{sub 7} precursor tapes resulted in an inhomogeneous growth rate over the tape length and rather poor properties for the whole sample. We performed a set of experiments in order to clarify the mechanisms… more
Date: September 18, 2000
Creator: Solovyov, V.; Wiesmann, H. J.; Wu, L. J.; Zhu, Y. & Suenaga, M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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BAF(2) POST-DEPOSITION REACTION PROCESS FOR THICK YBCO FILMS.

Description: The basic processes of the so-called BaF{sub 2} process for the formation of YBa{sub 2}Cu{sub 3}O{sub 7}, YBCO, films as well as its advantages over the in situ formation processes are discussed in the previous chapter. The process and the properties of YBCO films by this process were also nicely described in earlier articles by R. Feenstra, et al. Here, we will discuss two pertinent subjects related to fabrication of technologically viable YBCO conductors using this process. These are (1) the … more
Date: July 12, 2001
Creator: Suenaga, M.; Solovyov, V. F.; Wu, L.; Wiesmann, H. J. & Zhu, Y.
Item Type: Refine your search to only Book
Partner: UNT Libraries Government Documents Department
open access

ELECTRON MICROSCOPY ANALYSIS OF THE INTERMEDIATE PHASES FORMED DURING THE NUCLEATION OF YBa{sub 2}Cu{sub 3}O{sub 7-{delta}} FILM

Description: Recently, considerable efforts have been made in growing bi-axially aligned thick YBa{sub 2}Cu{sub 3}O{sub 7} (YBCO) films on a flexible, textured metallic substrate for electrical power applications. The BaF{sub 2} post-deposition annealing process is one of the most promising methods. To understand the nucleation and growth mechanism of YBCO in this process, extended transmission electron microscopy analysis has been made. Here, we report on the evolution of Ba-Y oxy-fluoride which is pertine… more
Date: August 5, 2001
Creator: Wu, L.; Zhu, Y.; Slovyov, v. F.; Wiesmann, H. J. & Suenaga, M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Nucleation of YBA(2)CU(3)O(7-D) In the BAF(2) Process

Description: The nucleation of the c-axis aligned and non-c-axis YBa{sub 2}Cu{sub 3}O{sub {approximately}6.1} (YBCO) from precursor films on [001]-cut SrTiO{sub 3} was investigated for the so-called BaF{sub 2} process. Specimens with different thickness were quenched from 735 C, then studied by transmission electron microscopy and x-ray diffraction techniques. Preceding the formation of YBCO nuclei, three intermediate phases of (Y,Ba) oxy-fluoride and a transition phase without F were found in the precursor… more
Date: June 24, 2001
Creator: Wu, L.; Solovyov, V. F.; Wiesmann, H. J.; Zhu, Y. & Suenaga, M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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