Download or read book Photoelectronic Properties of Zinc Phosphide Crystals Films and Heterojunctions Quarterly Progress Report No 1 February 26 June 30 1979 written by and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A closed tube method has been developed for the synthesis of Zn3P2 from the elements which eliminates the potential dangers associated with high P pressures. Subsequent materials synthesis will be done routinely by this method. Initial efforts at single crystal growth of Zn3P2 from this material yielded polycrystalline material because of nucleation along the walls of the tube. Techniques for improving the situation are being tested. Wafers of large-grain polycrystaline Zn3P2 have been received from Dr. A. Catalano at Delaware and will be used for exploratory research in the quarter ahead. Progress is reported on the development of a CVD apparatus for the deposition of wide bandgap oxides and sulfides on a variety of substrates including Zn3P2. Layer deposition by the close spaced vapor transport method to be applied to Zn3P2 was successfully tested using CdTe on both quartz and CdS substrates.

Download or read book Photoelectronic Properties of Zinc Phosphide Crystals Films and Heterojunctions written by Richard H. Bube and published by . This book was released on 1980 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this research program is to investigate the photoelectronic properties of zinc phosphide (Zn3P2 in single crystal form, in thin-film form, and in heterojunctions in which Zn3P2 forms one of the elements. This research will be directed toward understanding the role of crystalline defects and impurities in Zn3P2, the nature of the electronic charge transport in single crystal and thin-film material, and the properties of photovoltaic heterojunctions involving Zn3P2. The scope of the program extends from basic investigations of materials properties on single crystals to the preparation and characterization of all-thin-film heterojunction divices. One of the principal motivations behind this research program is the realization that Zn3P2 is a relatively uninvestigated yet ideal component for photovoltaic heterojunction use in solar energy conversion. The proposed program will concentrate on the basic materials problems involved with Zn3P2, providing the kind of information needed for other more developmental programs directed toward actual practical cells.

Download or read book Photoelectronic Properties of Zinc Phosphide Crystals Films and Heterojunctions written by and published by . This book was released on 1981 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Photoelectronic Properties of Zinc Phosphide Crystals Films and Heterojunctions written by Richard H. Bube and published by . This book was released on 1982 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Photoelectronic Properties of Zinc Phosphide Crystals Films and Heterojunctions Quarterly Progress Report No 13 for the Period Covering April 1 June 30 1982 written by and published by . This book was released on 1982 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Photoelectronic Properties of Zinc Phosphide Crystals Films and Heterojunctions Quarterly Progress Report No 2 July 1 September 30 1979 written by and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The closed tube horizontal growth method has been pursued for the growth of single crystals of Zn3P2. The rate of material transport was increased by increasing the temperature difference between source and growth regions and by decreasing the distance involved. A boule with only 2 grains in a 12 mm diameter has been obtained. The as-grown resistivity of this single crystal Zn3P2 was 50 ohm-cm, which was reduced to 10 ohm-cm by subsequent annealing in hydrogen at 410°C. Initial ZnO/Zn3P2 (CVD deposition of ZnO) and CdS/Zn3P2 (CdS by vacuum evaporation) heterostructures were fabricated using small samples of single crystal Zn3P2 sent from Tony Catalano at Delaware. Not surprisingly, only small photoresponse was obtained with these totally experimental cells. Zn3P2 films deposited on glass by CSVT were shown to be amorphous whereas those deposited on single crystal CdS were polycrystalline. Indeed several samples showed appreciable large-grain columnar growth at an angle to the substrate plane. Laser annealing was shown to have dramatic effects in crystallizing Zn3P2 films deposited on Si3N4 film substrates on sngle crystal Si. Thin films of Zn3P2 were deposited on glass substrates by vacuum evaporation. As-deposited film resistivities fell in the range of 106−1°sup 8/ ohm-cm; an apparently temporary decrease in resistivity by factors up to 50 could be obtained by annealing in hydrogen. Optical transmission and reflection spectra, as well as photoconductivity spectral response spectral response spectra were measured on a number of these films.

Download or read book Energy Research Abstracts written by and published by . This book was released on 1981 with total page 508 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Photoelectronic Properties of Zinc Phosphide Crystals Films and Heterojunctions Quarterly Progress Report No 10 for the Period July 1 September 30 1981 written by and published by . This book was released on 1981 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Photoelectronic Properties of Zinc Phosphide Crystals Films and Heterojunctions for the Period July 1 September 30 1980 written by Solar Energy Research Institute and published by . This book was released on 1980 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Photoelectronic Properties of Zinc Phosphide Crystals Films and Heterojunctions for the Period July 1 September 30 1981 written by Richard H. Bube and published by . This book was released on 1981 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Solar Energy Update written by and published by . This book was released on 1980 with total page 972 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Photoelectronic Properties of Zinc Phosphide Crystals Films and Heterojunctions for the Period October 1 December 31 1981 written by Richard H. Bube and published by . This book was released on 1981 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Photoelectronic Properties of Zinc Phosphide Crystals Films and Heterojunctions for the Period January 1 March 31 1982 written by Richard H. Bube and published by . This book was released on 1982 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Photoelectronic Properties of Zinc Phosphide Crystals Films and Heterojunctions Quarterly Progress Report No 11 for the period October 1 December 31 1981 written by and published by . This book was released on 1981 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Photoelectronic Properties of Zinc Phosphide Crystals Films and Heterojunctions written by Richard H. Bube and published by . This book was released on 1981 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this research program is to investigate the photoelectronic properties of zinc phosphide (Zn3P2 in single crystal form, in thin-film form, and in heterojunctions in which Zn3P2 forms one of the elements. This research will be directed toward understanding the role of crystalline defects and impurities in Zn3P2, the nature of the electronic charge transport in single crystal and thin-film material, and the properties of photovoltaic heterojunctions involving Zn3P2. The scope of the program extends from basic investigations of materials properties on single crystals to the preparation and characterization of all-thin-film heterojunction divices. One of the principal motivations behind this research program is the realization that Zn3P2 is a relatively uninvestigated yet ideal component for photovoltaic heterojunction use in solar energy conversion. The proposed program will concentrate on the basic materials problems involved with Zn3P2, providing the kind of information needed for other more developmental programs directed toward actual practical cells.

Download or read book Government reports annual index written by and published by . This book was released on 199? with total page 900 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Photoelectronic Properties of Zinc Phosphide Crystals Films and Heterojunctions for the Period April 1 June 30 1980 written by Solar Energy Research Institute and published by . This book was released on 1980 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: