13 results on '"Gillanders, M."'
Search Results
2. Gallium Arsenide welded panel technology for advanced spaceflight applications
- Author
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Lillington, D. R, Gillanders, M. S, Garlick, G. F. J, Cavicchi, B. T, Glenn, G. S, and Tobin, S. P
- Subjects
Energy Production And Conversion - Abstract
A significant impediment to the widespread use of GaAs solar cells in space is the cost and weight of the GaAs substrate. In order to overcome these problems, Spectrolab is pursuing thin cell technologies encompassing both liquid phase epitaxy (LPE) GaAs on GaAs and MOCVD GaAs on Ge cells. Spectrolab's experience in the manufacture of 4 to 6 mil 2 cm x 4 cm GaAs cells on a LPE production line is discussed. By thinning the cells at a late state of processing, production yields comparable to 12 mil cells have been achieved. Data are presented showing that GaAs cells can be welded without degradation and have achieved minimum average efficiencies of 18 percent AM0, 28 C with efficiencies up to 20 percent. Spectrolab, in conjunction with Spire Corporation has also been pursuing GaAs on Ge cell technology in support of larger area lighter weight power systems. Data are presented showing that individual 2 cm x 2 cm, 8 mil cell efficiencies up to 21.7 percent have been achieved. Efficiencies up to 24 percent AM0 will be possible by optimizing the GaAs/Ge interface. Cells have been welded without degradation using silver interconnects and have been laid down on an aluminum honeycomb/graphite facesheet substrate to produce a small coupon. The efficiency was 18.1 percent at AM0, 28 C.
- Published
- 1989
3. Radiation damage of gallium arsenide production cells
- Author
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Mardesich, N, Joslin, D, Garlick, J, Lillington, D, Gillanders, M, Cavicchi, B, Scott-Monck, J, Kachare, R, and Anspaugh, B
- Subjects
Energy Production And Conversion - Abstract
High efficiency liquid phase epitaxy (LPE) gallium arsenide cells were irradiated with 1 Mev electrons up to fluences of 1 times 10 to the 16th power cm-2. Measurements of spectral response and dark and illuminated I-V data were made at each fluence and then, using computer codes, the experimental data was fitted to gallium arsenide cell models. In this way it was possible to determine the extent of the damage, and hence damage coefficients in both the emitter and base of the cell.
- Published
- 1987
4. Pilot production experience of LPE GaAs solar cells
- Author
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Gillanders, M, Cavicchi, B, Lillington, D, and Mardesich, N
- Subjects
Electronics And Electrical Engineering - Abstract
This paper is a follow-up to a previous paper written following the completion of Spectrolab's LPE GaAs production facility in 1985 (Mardesich et al., 1985). Progress made since that time is discussed. Significant improvements in the manufacture of these devices, resulting in better cell performance and higher yields, are described. Pilot production cell performance data are presented, including lot distribution of efficiency, Jsc, Voc and CFF. 1-MeV electron radiation damage results are reported.
- Published
- 1987
5. Improved techniques of parallel gap welding and monitoring
- Author
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Mardesich, N and Gillanders, M. S
- Subjects
Mechanical Engineering - Abstract
Welding programs which show that parallel gas welding is a reliable process are discussed. When monitoring controls and nondestructive tests are incorporated into the process, parallel gap welding becomes more reliable and cost effective. The panel fabrication techniques and the HAC thermal cycling test indicate reliable product integrity. The design and building of automated tooling and fixturing for welding are discussed.
- Published
- 1984
6. Pilot production and testing of high efficiency wraparound contact solar cells
- Author
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Gillanders, M
- Subjects
Energy Production And Conversion - Abstract
Modifications were made to the process sequence until a device capable of high performance and satisfactory processing yields could be fabricated on a production line. Pilot production resulted in a 2 x 4 cm screen printed dielectric wraparound contact solar cell with average 28 C, Air Mass Zero (AMO) conversion efficiencies of 14.2% and reasonable process yields. This high performance was obtained with two different back contact configurations, making the device acceptable for many applications.
- Published
- 1981
7. High efficiency wraparound contact solar cells /HEWACS
- Author
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Gillanders, M and Opjorden, R
- Subjects
Energy Production And Conversion - Abstract
A cell technology, producing high efficiency wrap-around contact solar cells (HEWACS), with both electrical contacts on the back and AMO conversion efficiencies of almost 15%, is presented. A flow chart indicating the baseline process sequence along with the process changes is given. Tests checking for coating delamination and contact integrity, those measuring contact strength, and thermal cycle tests, successfully demonstrated that this cell technology is ready to be moved to the pilot production stage.
- Published
- 1980
8. The HEWAC pilot line experience
- Author
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Gillanders, M and Opjorden, R
- Subjects
Energy Production And Conversion - Abstract
Advanced silicon solar cells with both electrical contacts on the back side of the cell are described. These high efficiency wrap around contact solar cells (HEWACS) utilize a screen printed dielectric insulation layer to isolate the 'n' and 'p' contacts from each other. Development of a device exhibiting high AMO conversion efficiencies is addressed along with the processing of such cells to a point where cell fabrication can be carried out by production personnel under operating production line conditions.
- Published
- 1980
9. Final qualification test results of XTJ triple junction space solar cell to AIAA - S-111 - 2005 and Spectrolab test standards.
- Author
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Bongim Jun, Fetzer, C.M., Rouhani, K., Wise, W.G., Krut, D., Kiem Bui, Hom, D., Cho, C.J., Wu, J.Z., Anaya, R., Bardfield, R., Russell, D.A., Leung, P., Gillanders, M., Sharma, S.K., and Hanley, J.P.
- Published
- 2010
- Full Text
- View/download PDF
10. Qualification status of 30% efficient next triple junction (XTJ) GaInP2/GaAs/Ge solar cells to AIAA S-111-2005 standard.
- Author
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Bongim Jun, Fetzer, C., Rouhani, K., Bardfield, R., Kiem Bui, Hom, D., Gillanders, M., and Sharma, S.K.
- Published
- 2009
- Full Text
- View/download PDF
11. Drivers of adoption of ecological approaches
- Author
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Barnes, Andrew, Candemir, Ahmet, De Bauw, Michiel, Duvaleix, Sabine, Florian, Violeta, Hoglind, Lisa, Hyland, John, Kilcline, Kevin, Leduc, Gaelle, O'Donoghue, Cathal, Polge, Etienne, Thompson, Bethan, Van Ruymbeke, Kato, Billaudet, Larissa, Biseul, Pierre-Alexandre, Carvin, Olivier, Coisnon, Thomas, Engström, E., Clavin, Dan, Gillanders, M., Gourtay, L., Gueret, L., Hansson, Helena, Henchion, M., Jeanneaux, Philippe, Jin, Yan, Konstantidelli, Vasilia, Lassalas, Marie, Latruffe, Laure, Leavy, Elaine, Lynch, R., Manevska-Tasevska, Gordana, Pages, Hugo, Rosu, Elisabeta, Rousseliere, Damien, Ryan, Mary, Said, Sandra, Toma, Luiza, Tzouramani, Irene, and Vranken, Liesbet
- Subjects
2. Zero hunger ,15. Life on land - Abstract
This deliverable (D2.3) of the LIFT project presents the results of a series of investigations around up-take of ecological approaches across the value chain. We use primary and secondary data collected utilising a number of methods, built on conceptual frameworks developed within LIFT and elsewhere. This provides a range of empirical investigations for an overview of farming, supply chains and consumption drivers which may constrain or enable uptake of ecological approaches. Both exogenous and endogenous drivers were considered for these studies. The report is presented as a set of summaries from academic paper outputs - to show the individual exercises across farmers, value chains and consumers – and to understand both the barriers and enablers for transition to more ecological approaches within European farming. A summary table is provided to show these investigations, as well as the approach used and the type of data collected. Specifically the following sets of studies are presented: Typologies of farm activity and farmer perceptions towards ecological practices.This allows us to partition a large scale farmer dataset (from the LIFT large-scale farmer survey) with multiple variables of interest [papers 1,2]. Examination of the exogenous and endogenous drivers behind ecological uptake, such as gender, the farm family life-cycle, neighbouring farms and supply chains.These papers take either a quantitative approach, through the application of behavioural models, or a qualitative approach to understand what drives this decision to adopt ecological practices [papers 3,4,5,6]. Examination of the value chain, collaboration and cooperation.These are explored through quantitative and qualitative routes to understand how value chains operate for ecological practices, compared to conventional practices, and how actors engage within specific value chains [papers 7,8,9,10,11]. Finally the role of consumption is explored, through market segmentation, labels or specific traits of food products that offer opportunities to promote ecological practices [papers 12,13,14]. Overall, we find much heterogeneity in both practice and attitudes towards production and consumption of ecological approaches. The investigations presented here provide illustrations of how these approaches and perceptions are driven by both personal, informal and formal institutional influences, such as the support from local market conditions or sharing of knowledge. This leads to us understand the relationships between economic and non-economic goals, which are key to eventual uptake of ecological approaches. Incentives were considered to balance the conflicts between endogenous and exogenous drivers, such as labelling and support for social incentives, but also as a means to overcome perceived or real barriers through mechanisms which support further collaboration between farmers.
12. Drivers of adoption of ecological approaches
- Author
-
Barnes, Andrew, Candemir, Ahmet, De Bauw, Michiel, Duvaleix, Sabine, Florian, Violeta, Hoglind, Lisa, Hyland, John, Kilcline, Kevin, Leduc, Gaelle, O'Donoghue, Cathal, Polge, Etienne, Thompson, Bethan, Van Ruymbeke, Kato, Billaudet, Larissa, Biseul, Pierre-Alexandre, Carvin, Olivier, Coisnon, Thomas, Engström, E., Clavin, Dan, Gillanders, M., Gourtay, L., Gueret, L., Hansson, Helena, Henchion, M., Jeanneaux, Philippe, Jin, Yan, Konstantidelli, Vasilia, Lassalas, Marie, Latruffe, Laure, Leavy, Elaine, Lynch, R., Manevska-Tasevska, Gordana, Pages, Hugo, Rosu, Elisabeta, Rousseliere, Damien, Ryan, Mary, Said, Sandra, Toma, Luiza, Tzouramani, Irene, and Vranken, Liesbet
- Subjects
2. Zero hunger ,15. Life on land - Abstract
This deliverable (D2.3) of the LIFT project presents the results of a series of investigations around up-take of ecological approaches across the value chain. We use primary and secondary data collected utilising a number of methods, built on conceptual frameworks developed within LIFT and elsewhere. This provides a range of empirical investigations for an overview of farming, supply chains and consumption drivers which may constrain or enable uptake of ecological approaches. Both exogenous and endogenous drivers were considered for these studies. The report is presented as a set of summaries from academic paper outputs - to show the individual exercises across farmers, value chains and consumers – and to understand both the barriers and enablers for transition to more ecological approaches within European farming. A summary table is provided to show these investigations, as well as the approach used and the type of data collected. Specifically the following sets of studies are presented: Typologies of farm activity and farmer perceptions towards ecological practices.This allows us to partition a large scale farmer dataset (from the LIFT large-scale farmer survey) with multiple variables of interest [papers 1,2]. Examination of the exogenous and endogenous drivers behind ecological uptake, such as gender, the farm family life-cycle, neighbouring farms and supply chains.These papers take either a quantitative approach, through the application of behavioural models, or a qualitative approach to understand what drives this decision to adopt ecological practices [papers 3,4,5,6]. Examination of the value chain, collaboration and cooperation.These are explored through quantitative and qualitative routes to understand how value chains operate for ecological practices, compared to conventional practices, and how actors engage within specific value chains [papers 7,8,9,10,11]. Finally the role of consumption is explored, through market segmentation, labels or specific traits of food products that offer opportunities to promote ecological practices [papers 12,13,14]. Overall, we find much heterogeneity in both practice and attitudes towards production and consumption of ecological approaches. The investigations presented here provide illustrations of how these approaches and perceptions are driven by both personal, informal and formal institutional influences, such as the support from local market conditions or sharing of knowledge. This leads to us understand the relationships between economic and non-economic goals, which are key to eventual uptake of ecological approaches. Incentives were considered to balance the conflicts between endogenous and exogenous drivers, such as labelling and support for social incentives, but also as a means to overcome perceived or real barriers through mechanisms which support further collaboration between farmers.
13. 1.55 µm wavelength band photonic crystal surface emitting laser with n-side photonic crystal and operation at up to 85 °C.
- Author
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Moodie D, Boylan K, Hattasan N, Rihani S, Pearce S, Qi L, Dosanjh S, Repiso Menendez E, Silva M, Spalding R, Burlinson S, Gillanders M, Turner D, and Berry G
- Abstract
We describe the structure, fabrication, and measured performance of a 1543 nm wavelength photonic crystal surface emitting laser. An asymmetric double lattice design was used to achieve single mode lasing with side mode suppression ratios >40 dB. The photonic crystal was formed using encapsulated air holes in an n-doped InGaAsP layer with an InGaAlAs active layer then grown above it. In this way a laser with a low series resistance of 0.32 Ω capable of pulsed output powers of 171 mW at 25 °C and 40 mW at 85 °C was demonstrated.
- Published
- 2024
- Full Text
- View/download PDF
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