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Research on stable, high-efficiency, large-area amorphous silicon based modules -- Task B

Description: This report documents progress in developing a stable, high- efficiency, four-terminal hybrid tandem module. The module consists of a semi-transparent, thin-film silicon:hydrogen alloy (TFS) top circuit and a copper indium diselenide (CuInSe{sub 2}) bottom circuit. Film deposition and patterning processes were successfully extended to 0.4-m{sup 2} substrates. A 33.2-W (8.4% efficient) module with a 3970-cm{sup 2} aperture area and a white back reflector was demonstrated; without the back reflec… more
Date: October 1, 1990
Creator: Mitchell, K.W. & Willet, D.R. (Siemens Solar Industries, Camarillo, CA (USA))
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Spectroscopic investigations of small-molecule interactions on metal oxide surfaces. Final report, September 1, 1978-December 31, 1981

Description: Angle integrated and angle resolved ultraviolet photoelectron spectroscopy (UPS and ARPES) and high resolution electron energy loss spectroscopy (HREELS) have been performed on the low index single crystal surfaces of zinc oxide. Study of CO/ZnO shows that the mode of binding is dominated by 5sigma donation from the carbon end of the molecule to the unsaturated surface zinc ion with little ..pi.. backbonding to the CO2..pi..* orbital. This electronic structure is verified by a HREELS study. The… more
Date: June 28, 1982
Creator: Solomon, E. I. & McFeely, F. R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Development and testing of regenerable hot-coal-gas desulfurization sorbents

Description: Investigations over several years at the Morgantown Energy Technology Center have been concerned with the development of a regenerable metal oxide desulfurization sorbent which would function on hot coal-derived fuel gas. In the latest phase of testing, a combination of zinc oxide with iron oxide as zinc ferrite has produced a sorbent which has demonstrated regenerability and capability of removing sulfur from simulated hot coal gas to a level of 1 to 10 ppM by volume. The principal finding at … more
Date: October 1, 1981
Creator: Grindley, T. & Steinfeld, G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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(Investigation of low-cost solar cells based on Cu/sub 2/O). Third quarterly progress report, November 1, 1979-January 31, 1980

Description: Efforts this quarter concentrated on completion and check-out of the MBE system, deposition of ZnS films, analysis of the internal photoresponse for Cu-Cu/sub 2/O cells, and fabrication and characterization of Cu-Cu/sub 2/O solar cells. In-doped ZnS films with very good optical quality and finite conductivity were obtained by co-depositing In and ZnS. Analysis of the internal photoresponse indicated that minority carrier diffusion lengths on the order of 10 ..mu..m are being achieved with the p… more
Date: March 12, 1980
Creator: Olsen, L. C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Research on stable, high-efficiency amorphous silicon multijunction modules

Description: This report describes the progress made during Phase 1 of research and development program to obtain high-efficiency amorphous silicon alloy multijunction modules. Using a large-area deposition system, double-and triple-junction cells were made on stainless steel substrates of over 1 ft{sup 2} area with Ag and ZnO predeposited back reflector. Modules of over 1 ft{sup 2} were produced with between 9.2% and 9.9 initial aperture-area efficiencies as measured under a USSC Spire solar simulator. Eff… more
Date: April 1, 1992
Creator: Banerjee, A.; Chen, E.; Clough, R.; Glatfelter, T.; Guha, S.; Hammond, G. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Hot gas desulfurization with sorbents containing oxides of zinc, iron, vanadium and copper

Description: The main objective of this research is to evaluate the desulfurization performance of novel sorbents consisting of different combinations of zinc, iron, vanadium and copper oxides; and to develop a sorbent which can reduce H{sub 2}S levels to less than 1 ppmv, which can stabilize zinc, making operations above 650{degrees}C possible, and which can produce economically recoverable amounts of elemental sulfur during regeneration. This objective will be accomplished by evaluating the sorbent perfor… more
Date: October 1, 1991
Creator: Akyurtlu, A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Hot gas cleanup for molten carbonate fuel cells. A zinc oxide reactor model, Final report

Description: Utilization of coal gasifiers to power MCFC requires a cleanup system to remove sulfur and particulates. Of the two near term options available for desulfurization of gasifier effluent, namely low temperature cleanup utilizing absorber/stripper technology, and hot gas cleanup utilizing metal oxides, there is a clear advantage to using hot gas cleanup. Since the MCFC will operate at 1200/sup 0/F, and the gasifier effluent could be between 1200 to 1900/sup 0/F, a hot gas cleanup system will requi… more
Date: September 16, 1980
Creator: Steinfeld, G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Research on stable, high-efficiency amorphous silicon multijunction modules

Description: This report describes research on semiconductor and non-semiconductor materials to enhance the performance of multi-band-gap, multijunction panel with an area greater than 900 cm[sup 2] by 1992. Double-junction and triple-junction cells are mode on a Ag/ZnO back reflector deposited on stainless steel substrates. An a-SiGe alloy is used for the i-layer in the bottom and the middle cells; the top cell uses an amorphous silicon alloy. After the evaporation of an antireflection coating, silver grid… more
Date: September 1, 1992
Creator: Guha, S. (United Solar Systems Corp., Troy, MI (United States))
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Research on polycrystalline thin film submodules based on CuInSe sub 2 materials

Description: This report describes progress during the first year of a three-year research program to develop 12%-efficient CuInSe{sub 2} (CIS) submodules with area greater than 900 cm{sup 2}. To meet this objective, the program was divided into five tasks: (1) windows, contacts, substrates; (2) absorber material; (3) device structure; (4) submodule design and encapsulation; and (5) process optimization. In the first year of the program, work was concentrated on the first three tasks with an objective to de… more
Date: May 1, 1992
Creator: Catalano, A.; Arya, R.; Carr, L.; Fieselmann, B.; Lommasson, T.; Podlesny, R. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Studies in Semiconducting Metal Oxides in Conjunction With Silicon for Solid State Gas Sensors. Progress Report, April 1, 1977-September 30,1979

Description: A fundamental investigation of SnO/sub 2/ and ZnO thin films with emphasis on their use in solid state gas detection is discussed. Methods of thin film preparation, described here, include the chemical vapor deposition (CVD) technique for SnO/sub 2/ films and the radio frequency sputtering technique for SnO/sub 2/ and ZnO films. The use of Auger electron spectroscopy, (AES), transmission electron microscopy, (TEM) and x ray diffractometry, (XRD) in the analysis of these films is reported. Caref… more
Date: September 1, 1979
Creator: Jordan, A. G. & Advani, G. N.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Investigation of solar cells based on Cu/sub 2/O. Quarterly progress report, May 1-July 31, 1979

Description: Efforts during this quarter have involved a detailed study of photocurrent from Cu/Cu/sub 2/O Schottky barriers, development of a MBE system, and studies of reactively sputtered ZnO films. Optical constants were determined for Cu films as a function of film thickness and utilized to determine optimum AR coating thicknesses to maximize the photocurrent from Cu/Cu/sub 2/O cells. Using results of these analyses, an AM1 photocurrent of 7.4 mA/cm/sup 2/ has been obtained. Fabrication and purchasing … more
Date: September 7, 1979
Creator: Olsen, L. C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Hot gas desulfurization with sorbents containing oxides of zinc, iron, vanadium and copper

Description: The main objective of this research is to evaluate the desulfurization performance of novel sorbents consisting of different combinations of zinc, iron, vanadium and copper oxides; and to develop a sorbent which can reduce H{sub 2}S levels to less than 1 ppmv, which can stabilize zinc, making operations above 650{degrees}C possible, and which can produce economically recoverable amounts of elemental sulfur during regeneration. This objective will be accomplished by evaluating the sorbent perfor… more
Date: January 1, 1992
Creator: Akyurtlu, A. & Akyurtlu, J.F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A Kinetic Study of Methanol Synthesis in a Slurry Reactor Using a CuO/ZnO/Al sub 2 O sub 3 Catalyst

Description: A kinetic model that describes the methanol production rate over a CuO/ZnO/AI{sub 2}0{sub 3} catalyst (United Catalyst L-951) at typical industrial operating conditions is developed using a slurry reactor. Different experiments are conducted in which the H{sub 2}/(CO+CO{sub 2}) ratio is equal to 2, 1, and 0.5, respectively, while the CO/CO{sub 2} ratio is held constant at 9. At each H{sub 2}/(CO+CO{sub 2}) ratio the space velocity is set at four different values in the range of 3000-13,000 1/hr… more
Date: May 1, 1992
Creator: Al-Adwani, H. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Research on stable, high-efficiency, amorphous silicon multijunction modules

Description: This report describes work to demonstrate a multijunction module with a stabilized'' efficiency (600 h, 50{degrees}C, AM1.5) of 10.5%. Triple-junction devices and modules using a-Si:H alloys with carbon and germanium were developed to meet program goals. ZnO was used to provide a high optical transmission front contact. Proof of concept was obtained for several important advances deemed to be important for obtaining high (12.5%) stabilized efficiency. They were (1) stable, high-quality a-SiC:H … more
Date: August 1, 1992
Creator: Catalano, A.; Bennett, M.; Chen, L.; D'Aiello, R.; Fieselmann, B.; Li, Y. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Electron Transfer at Sensitized Semiconductor Electrodes

Description: Electron transfer from the excited state of sensitizing dyes to the conduction band of semiconductors has been studied through photoelectrochemical techniques. Two systems were analyzed in detail: rhodamine B on ZnO and rose bengal on TiO/sub 2/. Prior to electrochemical experimentation, the adsorption characteristics of these dyes were investigated using ZnO, ZnS, and TiO/sub 2/ single crystals as substrates. Absorbance measurements of the adsorbed dye were taken as a function of the solution … more
Date: March 1977
Creator: Spitler, Mark Thomas
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries Government Documents Department
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Studies involving high temperature desulfurization/regeneration reactions of metal oxides for fuel cell development. Final report

Description: Research conducted at Giner, Inc. during 1981 to 1983 under the present contract has been a continuation of the investigation of a high temperature regenerable desulfurization process capable of reducing the sulfur content in coal gases from 200 ppM to 1 ppM. The overall objective has been the integration of a coal gasifier with a molten carbonate fuel cell, which requires that the sulfur content be below 1 ppM. Commercially available low temperature processes incur an excessive energy penalty.… more
Date: October 1, 1983
Creator: Jalan, V.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The Effect of Chemical Additives on the Synthesis of Ethanol

Description: The objective of this research is to elucidate the role of various chemical additives on ethanol synthesis over Rh- and Ni-based catalysts. Chemical additives used for this study will include S, P, Ag, Cu, Mn, and Na which have different electronegativities. The effect of additives on the surface state of the catalysts, heat of adsorption of reactant molecules, reaction intermediates, reaction pathways, reaction kinetics, and product distributions is/will be investigated by a series of experime… more
Date: September 20, 1991
Creator: Chuang, S. S. C. & Balakos, M. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Methanol and methyl fuel catalysts. Final technical report, September 1980-August 1983

Description: Copper-based catalysts for alcohol synthesis were prepared, tested for catalytic activity and selectivity, and characterized. These catalysts include Cu/ZnO, Cu/Co/ZnO, Cu/Co/Cr/sub 2/O/sub 3/, Cu/Co/Cr/sub 2/O/sub 3//K/sub 2/O, and Cu/ZnO/KOH. The chromia-containing catalysts exhibited a low activity and selectivity, while the Cu/ZnO catalyst was verified to be a very active and selective methanol synthesis catalyst. Cobalt imparted a methanation function to the catalysts, while potassium supp… more
Date: December 1, 1983
Creator: Klier, K.; Herman, R.G. & Simmons, G.W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Research on stable, high-efficiency, large-area, amorphous-silicon-based submodules

Description: The primary objective of this subcontract is to develop the technology for same bandgap, amorphous silicon tandem junction photovoltaic modules having an area of at least 900 cm{sup 2} with the goal of achieving an aperture area efficiency of 9%. A further objective is to demonstrate modules that retain 95% of their under standard light soaking conditions. Our approach to the attainment of these objective is based on the following distinctive technologies: (a) in-house deposition of SiO{sub 2}/… more
Date: June 1, 1991
Creator: Delahoy, A.E.; Tonon, T. & Macneil, J. (Chronar Corp., Princeton, NJ (USA))
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Support effects studied on model supported catalysts

Description: We are studying model catalysts in which the active phase is deposited onto flat oxide substrates in order to understand how a catalyst is affected by its support. We have examined the following growth and stability of titania overlayers which had been vapor deposited onto a Rh foil; the growth of Pt films on ZnO(0001)Zn and O(0001)O and compared the results to those obtained for Pt on {alpha}-Al{sub 2}O{sub 3}(0001). Samples were prepared by vapor deposition of Pt onto flat substrates in ultra… more
Date: November 1, 1991
Creator: Gorte, R.G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Research on polycrystalline thin-film CuGaInSe[sub 2] solar cells

Description: This report describes research to fabricate high-efficiency CdZnS/CuInGaSe[sub 2] (CIGS) thin-film solar cells, and to develop improved transparent conductor window layers such as ZnO. A specific technical milestone was the demonstration of an air mass (AM) 1.5 global, 13% efficient, 1-cm[sup 2]-total-area CIGS thin-film solar cell. Our activities focused on three areas. First, a CIGS deposition: system was modified to double its substrate capacity, thus increasing throughput, which is critical… more
Date: November 1, 1992
Creator: Stanbery, B. J.; Chen, W. S.; Devaney, W. E. & Stewart, J. W. (Boeing Co., Seattle, WA (United States). Defense and Space Systems Group)
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Annual report on the Characterization on the high-level waste glasses.

Description: The waste compo itions PW-7c and PW-9 were defined and glass development was completed. Major variations in major oxide concentration would not grossly affect the leach rates of the glass. Impact and strength tests on nonradioactive glass showed that the waste glasses produced slightly less fine particulate than commercial glass. Waste glass had 60% of the strength of the soda-lime glass. A water-quench reduced thermal conductivity about 20%, and a 24-h hold at devitrification temperatures did … more
Date: June 1, 1978
Creator: Ross, W.A.; Bradley, D.J. & Bunnell, L.R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Zn/sub 3/P/sub 2/ as an improved semiconductor for photovoltaic solar cells. Ninth quarterly report, September 1, 1980-November 31, 1980

Description: Frequency and voltage dependent capacitance measurements of ZnO/Zn/sub 3/P/sub 2/ heterojunctions have been made and the results interpreted according to a model which considers the total capacitance arising from contributions due to the depletion layer capacitance, interface charges and a dipole charge. The capacitance of the devices is anomalously high at low frequencies but agrees well with the value calculated from the bulk carrier density at 1 MHz. The data suggest a significant contributi… more
Date: January 1, 1980
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Regenerative Process for Desulfurization of High Temperature Combustion and Fuel Gases. Quarterly Progress Report No. 8, January 1-March 31, 1978

Description: A highly reactive ..beta..-dicalcium silicate powder sample has been acquired from Professor D. Roy of Pennsylvania State University. We will use it in conjunction with our ash-binder pelletizing technique to form a highly regenerable and reactive sorbent for fluidized bed combustion. Other techniques of forming reactive silicates are also being studied. Simplified mathematical models have been developed for kiln regeneration based on the data with a small quartz rotary kiln reactor. The model … more
Date: January 1, 1978
Creator: Yang, R. T.; Albanese, A. S.; Chen, J. M.; Farber, G.; Kainz, F. B.; Pruzansky, J. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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