NASA Scientific and Technical Aerospace Reports
NASA Scientific and Technical Aerospace Reports
NASA Scientific and Technical Aerospace Reports
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Following our observation of slow degradation of short-circuit current (Isc) in crystalline silicon (x-Si) modules that was<br />
correlated with ultraviolet (UV) exposure dose, we initiated a new study of individual x-Si cells designed to determine the<br />
degradation cause. In this paper, we report the initial results of this study, which has accumulated 1056 MJ/m2 of UV dose<br />
from 1-sun metal-halide irradiance, equivalent to 3.8 years at our test site. At this time, the control samples are unchanged,<br />
the unencapsulated samples have lost about 2% of Isc, <strong>and</strong> the samples encapsulated in module-style packages have declined<br />
from 1% to 3%, depending on the cell technology.<br />
NTIS<br />
Crystallinity; Degradation; Exposure; Modules; Photovoltaic Conversion; Short Circuit Currents; Silicon<br />
20060002399 Case Western Reserve Univ., Clevel<strong>and</strong>, OH USA<br />
A Micro Hydrogen Air Fuel Cell<br />
Savinell, Robert F.; Wainright, Jesse S.; Oct. 1, 2005; 119 pp.; In English; Original contains color illustrations<br />
Contract(s)/Grant(s): F30602-97-2-0311; DARPA ORDER-J346; Proj-E117<br />
Report No.(s): AD-A440192; AFRL-IF-RS-TR-2005-351; No Copyright; Avail.: Defense <strong>Technical</strong> Information Center<br />
(DTIC)<br />
The object of this project is to produce a microfabricated hydrogen-air fuel cell by combining microfabrication<br />
techniques, polymer electrolyte fuel cell technology, <strong>and</strong> metal hydride fuel storage. The result will be a device capable of<br />
providing on-board electrical power for microelectronic circuits, sensors, <strong>and</strong> actuators with energy storage <strong>and</strong> power<br />
delivery capabilities considerably greater than that of thin-film batteries. Integrated packages of fuel cells (up to three cells<br />
in series) <strong>and</strong> fuel storage/hydrogen generation have been successfully fabricated <strong>and</strong> tested. Each of the major milestones has<br />
been achieved <strong>and</strong> the fabrication yields <strong>and</strong> device performance have been improved. We have also been looking for insertion<br />
opportunities <strong>and</strong> partners with which to develop this technology. Recently, we have signed an agreement of collaboration with<br />
The Ash lawn Group, LLC, of Alex<strong>and</strong>ria, VA to develop this technology to provide power for ‘smart’ munitions.<br />
DTIC<br />
Hydrogen Oxygen Fuel Cells; Microelectronics<br />
20060002440 National Renewable Energy Lab., Golden, CO USA<br />
InGaAs/GaAs QD Superlattices: MOVPE Growth, Structural <strong>and</strong> Optical Characterization, <strong>and</strong> Application in<br />
Intermediate-B<strong>and</strong> Solar Cells<br />
Norman, A. G.; Hanna, M. C.; Dippo, P.; Levi, D. H.; Feb. 2005; 14 pp.; In English<br />
Report No.(s): DE2005-15016460; NRLE-C/-520-37405; No Copyright; Avail.: National <strong>Technical</strong> Information Service<br />
(NTIS)<br />
We report on the growth <strong>and</strong> characterization of InGaAs/GaAs quantum dot (QD) superlattices for application in<br />
intermediate-b<strong>and</strong> solar cells (IBSCs). Good optical <strong>and</strong> structural quality QD superlattices with up to 50 periods were<br />
obtained by metal-organic vapor-phase epitaxy (MOVPE) growth on (l brace)113(r brace)B GaAs substrates. Solar cells<br />
containing Si (partial derivative)-doped <strong>and</strong> undoped QD superlattice absorption regions have been fabricated <strong>and</strong> their<br />
performance compared with control cells containing undoped GaAs or undoped InGaAs/GaAs superlattice absorption regions.<br />
The QD superlattice cells exhibited photoresponses extended to longer wavelengths than the control cells. The introduction<br />
of QDs to the absorbing region of the solar cells resulted in a decrease in the open-circuit voltages <strong>and</strong>, in some cases, a<br />
decrease in the short-circuit currents of the cells.<br />
NTIS<br />
Characterization; Gallium Arsenides; Indium Gallium Arsenides; Solar Cells; Superlattices<br />
20060002453 NVE Corp., Eden Prairie, MN USA<br />
Compact, Lightweight, Smart Battery Charger<br />
Beech, Russell S.; Oct. 26, 2005; 55 pp.; In English<br />
Contract(s)/Grant(s): W15P7T-04-C-K604<br />
Report No.(s): AD-A440548; CECOM/RDEC-0003AB; No Copyright; Avail.: CASI: A04, Hardcopy<br />
A rugged, level-3 smart battery charger was developed <strong>and</strong> delivered to the Army. This compact, lightweight charger<br />
weighs 22.5 ounces <strong>and</strong> has a volume of 55 cubic inches. The charger accepts either a universal AC input or a 19-28 VDC<br />
input <strong>and</strong> charges at up to 18 V <strong>and</strong> 5 A. A daisy-chain capability is included, allowing up to 10 units to be connected to a<br />
single power outlet. The operating temperature range is -20 deg C to +55 deg C. Test units passed specified environmental<br />
tests including: altitude, humidity, thermal shock, vibration, loose cargo, <strong>and</strong> drop. Status <strong>and</strong> error indicators provide visual<br />
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