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Thin Polycrystalline Films Of Indium Phosphide On Low Cost Substrates Quarterly Report No 1 September 30 1976 January 1 1977
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Book Synopsis Thin Polycrystalline Films of Indium Phosphide on Low-cost Substrates. Quarterly Report No. 1, September 30, 1976--January 1, 1977 by :
Download or read book Thin Polycrystalline Films of Indium Phosphide on Low-cost Substrates. Quarterly Report No. 1, September 30, 1976--January 1, 1977 written by and published by . This book was released on 1977 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Plans for the six main technical tasks of this 12-month program are discussed and the activities of the first three months are summarized. A new reactor system for growing thin films of InP by the metallorganic-hydride chemical vapor deposition (MO-CVD) process has been completed. Experiments using triethylindium (TEI) and phosphine (PH/sub 3/) reactants in a H/sub 2/ carrier gas have shown that InP films can be successfully grown over a range of deposition temperatures. Epitaxial growth of single-crystal films has been obtained on at least two different crystallographic orientations of single-crystal GaAs at temperatures as low as approximately 525/sup 0/C, and there is evidence that the process can be utilized at even lower temperatures--perhaps below approximately 475/sup 0/C. Films not intentionally doped are n type, with measured carrier concentrations in the 10/sup 16/ cm/sup -3/ range and electron mobilities up to approximately 2000 cm/sup 2//V-sec (room temperature). Initial investigations involve single-crystal substrates (GaAs, sapphire, InP) but various low-cost materials--glasses, alumina ceramics, metals, and certain composites of these--are being selected and evaluated for subsequent use in the program. Specific candidate materials are discussed. The program also involves the formation and evaluation of heterojunction photovoltaic device structures using the InP layers formed by MO-CVD and deposited films of CdS, ZnCdS, and similar II-VI compounds and alloys; this work is done at Stanford University. During the first quarter, two techniques for producing ohmic contacts of Au/Zn/Au on p-type InP were successfully developed, with low contact resistances being achieved following annealing in H/sub 2/ at temperatures up to 475/sup 0/C. Planned work for the next quarter is outlined.
Download or read book Energy Research Abstracts written by and published by . This book was released on 1978 with total page 640 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Thin polycrystalline films of indium phosphide on low-cost substrates by : Rockwell International. Electronics Research Division
Download or read book Thin polycrystalline films of indium phosphide on low-cost substrates written by Rockwell International. Electronics Research Division and published by . This book was released on 1977 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Thin Polycrystalline Films of Indium Phosphide on Low-cost Substrates by : Ralph Powers Ruth
Download or read book Thin Polycrystalline Films of Indium Phosphide on Low-cost Substrates written by Ralph Powers Ruth and published by . This book was released on 1977 with total page 80 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 1978 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Thin Polycrystalline Films of Indium Phosphide on Low-cost Substrates. Quarterly Report No. 3, April 3--July 2, 1977 by :
Download or read book Thin Polycrystalline Films of Indium Phosphide on Low-cost Substrates. Quarterly Report No. 3, April 3--July 2, 1977 written by and published by . This book was released on 1977 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The program is intended to develop the metalorganic chemical vapor deposition (MO-CVD) process for growth of InP films using triethylindium (TEI) and phosphine (PH/sub 3/) reactants in a H/sub 2/ carrier gas, and then to prepare such films on inexpensive substrate materials for subsequent fabrication of heterojunction polycrystalline solar cells by deposition of CdS (or other semiconductor) on the InP. Minor changes in reactor design have permitted achievement of InP film growth rates up to four times larger than those previously obtained. Deposition conditions have been established for obtaining good-quality undoped n-type epitaxial InP films on single-crystal (111A) and (111B) InP substrates, and p-type Zn-doped epitaxial InP films have been produced on both GaAs and InP single-crystal substrates, with doping concentrations in the 10/sup 16/-10/sup 18/ cm/sup -3/ range. Experiments have continued on the growth of polycrystalline InP films on various low-cost substrates, including several glasses, metals and metal alloys, and intermediate layers of metals and semiconductors previously deposited on glass substrates; a wide range of InP film properties has been obtained in these studies, results of which are summarized. Experimental Schottky-barrier device structures, employing thin Au barrier layers, have been fabricated on p-type InP films prepared in various single- and multiple-layer configurations. Detailed characterization of the transport properties in both undoped n-type epitaxial InP films on GaAs : Cr and InP : Fe semi-insulating substrates and Zn-doped p-type epitaxial films on GaAs : Cr substrates is presented and discussed. The first heterojunction photovoltaic solar cell employing a vacuum-deposited n-type CdS film and an epitaxial p-type InP film grown by MO-CVD has been fabricated and characterized.
Book Synopsis Thin Polycrystalline Films of Indium Phosphide on Low-cost Substrates by :
Download or read book Thin Polycrystalline Films of Indium Phosphide on Low-cost Substrates written by and published by . This book was released on 1977 with total page 57 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government Reports Annual Index by :
Download or read book Government Reports Annual Index written by and published by . This book was released on 1984 with total page 1316 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Thin Polycrystalline Films of Indium Phosphide on Low-cost Substrates by :
Download or read book Thin Polycrystalline Films of Indium Phosphide on Low-cost Substrates written by and published by . This book was released on 1977 with total page 57 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government Reports Announcements & Index by :
Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1984-05 with total page 1090 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Monthly Catalog of United States Government Publications by : United States. Superintendent of Documents
Download or read book Monthly Catalog of United States Government Publications written by United States. Superintendent of Documents and published by . This book was released on 1979 with total page 1130 pages. Available in PDF, EPUB and Kindle. Book excerpt: February issue includes Appendix entitled Directory of United States Government periodicals and subscription publications; September issue includes List of depository libraries; June and December issues include semiannual index
Book Synopsis Government Reports Annual Index: Keyword A-L by :
Download or read book Government Reports Annual Index: Keyword A-L written by and published by . This book was released on 1984 with total page 1092 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Official Gazette of the United States Patent and Trademark Office by : United States. Patent and Trademark Office
Download or read book Official Gazette of the United States Patent and Trademark Office written by United States. Patent and Trademark Office and published by . This book was released on 1978 with total page 1300 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Monthly Catalogue, United States Public Documents by :
Download or read book Monthly Catalogue, United States Public Documents written by and published by . This book was released on 1979 with total page 1568 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Thin Films of InP for Photovoltaic Energy Conversion. Second Quarterly Technical Progress Report, September 29, 1979-December 28, 1979 by :
Download or read book Thin Films of InP for Photovoltaic Energy Conversion. Second Quarterly Technical Progress Report, September 29, 1979-December 28, 1979 written by and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A research study is being conducted for the purpose of developing a low-cost high-efficiency thin-film InP heterojunction solar cell based on InP films grown by the metalorganic chemical vapor deposition (MO-CVD) process on suitable substrates. Heterostructure devices of CdS/InP (and possibly indium-tin oxide/InP) are to be prepared at Stanford University using the MO-CVD InP films grown at Rockwell. The work of the second quarter of the program is summarized. Growth parameters have been established using new triethylindium, diethylzinc (DEZn), and PH/sub 3/ sources for the formation of Zn-doped p-type InP films in the modified MO-CVD reactor system. Appropriately doped films have been prepared and sent to Stanford for use in deposition of CdS layers. An investigation of the properties of grains and grain boundaries in polycrystalline InP films was begun using several polycrystalline film/substrate combinations, including tungsten (W) layers produced by roller coating and screen-printing on polycrystalline alumina, and mechanically abraded surfaces of single-crystal bulk InP:Fe wafers. An investigation was also undertaken into the use of GaP as an alternative intermediate-layer material to GaAs on low-cost substrates for subsequent growth of InP films. Auger electron spectroscopy analysis done on a group of specially prepared Zn-treated films of polycrystalline InP indicated the presence of Zn at surfaces of InP:Zn films grown on Al and/or heat-treated in high concentrations of DEZn at approx. 600/sup 0/C. However, no Zn was detected in polycrystalline films grown under deposition conditions that would be expected to produce highly doped p-type epitaxial films if single-crystal substrates were used.
Book Synopsis Polycrystalline And Amorphous Thin Films And Devices by : Lawrence Kazmerski
Download or read book Polycrystalline And Amorphous Thin Films And Devices written by Lawrence Kazmerski and published by Elsevier. This book was released on 2012-12-02 with total page 321 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polycrystalline and Amorphous Thin Films and Devices is a compilation of papers that discusses the electronic, optical, and physical properties of thin material layers and films. This compilation reviews the different applications of thin films of various materials used as protective and optical coatings, thermal transfer layers, and selective membranes from submicron- area VLSI memory units to large-area energy conservation devices. Some papers discuss the basic properties, such as growth, structure, electrical, and optical mechanisms that are encountered in amorphous and polycrystalline thin semiconductor films. For example, experiments on electronic structure of dislocations have led to a model for the intrinsic properties of grain boundaries in polycrystalline semiconductor thin films that can have an impact on the designs of high-efficiency, thin-film solar cells. Other papers review the problems encountered in these thin layers in active semiconductor devices and passive technologies. Techniques in film growth and control variables of source, substrate temperature, and substrate properties will determine the successful performance of the devices installed with these thin film layers. This compilation can prove valuable for chemists, materials engineers, industrial technologists, and researchers in thin-film technology.
Book Synopsis Thin Films Formed by Electrochemical Reactions by : Michael J. F. Gaze
Download or read book Thin Films Formed by Electrochemical Reactions written by Michael J. F. Gaze and published by . This book was released on 1966 with total page 37 pages. Available in PDF, EPUB and Kindle. Book excerpt:
