Searched for: subject%3A%22nanocrystalline%22
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Blackstone, Thijs (author)
A next step in the energy transition is to produce green fuels from sunlight. One way to achieve this is via high voltage photovoltaic (PV) devices which can directly drive electrolysis reactions to produce hydrogen or other chemical fuels. Group IV based multijunction (MJ) PV devices are a candidate to function as these high voltage devices.<br...
master thesis 2022
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de Vrijer, T. (author), Miedema, Sander (author), Blackstone, Thijs (author), van Nijen, D.A. (author), Han, C. (author), Smets, A.H.M. (author)
A logical next step for achieving a cost price reduction per Watt peak of photovoltaics (PV) is multijunction PV devices. In two-terminal multijunction PV devices, the photo-current generated in each subcell should be matched. Intermediate reflective layers (IRLs) are widely employed in multijunction devices to increase reflection at the...
journal article 2022
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Rycewicz, M.K. (author), Nosek, Adrian (author), Shin, D. (author), Ficek, Mateusz (author), Buijnsters, J.G. (author), Bogdanowicz, Robert (author)
In this paper, the effect of boron doping on the electrical, morphological and structural properties of free-standing nanocrystalline diamond sheets (thickness ~ 1 μm) was investigated. For this purpose, we used diamond films delaminated from a mirror-polished tantalum substrate following a microwave plasma-assisted chemical vapor deposition...
journal article 2022
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Roodenburg, Koos (author)
The development in solar cells began with wafer based cells, also called the first generation photovoltaic technology. Most of these wafer based cells were made of crystalline silicon. As a crystalline silicon cell must be relatively thick to absorb most of the incoming energy, the second generation (thin film solar cells) was introduced. In the...
master thesis 2021
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Murali, Arvind Ganesh (author)
Thin-film solar cells are second-generation solar cells and they are gaining more traction than the first-generation c-Si solar cells. This is due to the advantages they have over conventional solar cells. The advantages are that they are lightweight, flexible, cheaper and also have better aesthetics than conventional solar cells. Thin-film...
master thesis 2021
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Miedema, Sander (author)
In a future energy system, chemical energy carriers that can easily be stored, like hydrogen, are of vital importance. One possible way of producing carbonneutral hydrogen is by direct solar to hydrogen conversion in a photoelectrochemical cell (PEC). Silicon based multijunction solar cells are a possible candidate for the photovoltaic stack of...
master thesis 2021
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van Dingen, Julian (author)
For the far majority of current photovoltaic devices, photons with an energy below 1.1eV are not utilized. Adding a Plasma Enhanced Chemical Vapor Deposition (PECVD) processed germanium bottom cell to a multi-junction device has the potential to provide a low-cost boost in conversion efficiency by utilizing a part of this spectral range below 1...
master thesis 2021
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de Vrijer, T. (author), Smets, A.H.M. (author)
Doped layers are a determining factor for the performance of photovoltaic devices such as silicon heterojunction and thin film silicon solar cells. The material properties of doped hydrogenated amorphous/nanocrystalline silicon-oxide (a/nc-SiO X≥0 :H) films processed by plasma-enhanced chemical vapor deposition generally exhibit a tradeoff...
journal article 2021
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Zhao, Y. (author), Mazzarella, L. (author), Procel Moya, P.A. (author), Han, C. (author), Tichelaar, F.D. (author), Yang, G. (author), Weeber, A.W. (author), Zeman, M. (author), Isabella, O. (author)
Low parasitic absorption and high conductivity enable (n)-type hydrogenated nanocrystalline silicon [(n)nc-Si:H], eventually alloyed with oxygen [(n)nc-SiO<sub>x</sub>:H], to be deployed as window layer in high-efficiency silicon heterojunction (SHJ) solar cells. Besides the appropriate opto-electrical properties of these nanocrystalline...
journal article 2021
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de Vrijer, T. (author), Ravichandran, Ashwath (author), Bouazzata, Bilal (author), Smets, A.H.M. (author)
Low-cost multijunction photovoltaic devices are the next step in the solar energy revolution. Adding a bottom junction with a low bandgap energy material through plasma enhanced chemical vapor deposition (PECVD) processing could potentially provide a low-cost boost in conversion efficiency. A logical candidate for this low bandgap material is...
journal article 2021
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Zhao, Y. (author), Procel Moya, P.A. (author), Han, C. (author), Mazzarella, L. (author), Yang, G. (author), Weeber, A.W. (author), Zeman, M. (author), Isabella, O. (author)
Low activation energy (E<sub>a</sub>) and wide bandgap (E<sub>g</sub>) are essential for (p)-contacts to achieve effective hole collection in silicon heterojunction (SHJ) solar cells. In this work, we study Plasma-Enhanced Chemical Vapor Deposition p-type hydrogenated nanocrystalline silicon oxide, (p)nc-SiO<sub>x</sub>:H, combined with (p)nc...
journal article 2021
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van Nijen, D.A. (author)
For the continued growth of PV capacity, it will be necessary to store vast amounts of energy to overcome seasonal differences in energy generation. To this end, the conversion of electricity to liquid or gas fuels could play an important role in the future energy system. There are numerous ways to create fuels from solar energy, the...
master thesis 2020
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Zhao, Y. (author), Mazzarella, L. (author), Procel Moya, P.A. (author), Han, C. (author), Yang, G. (author), Weeber, A.W. (author), Zeman, M. (author), Isabella, O. (author)
Hydrogenated nanocrystalline silicon oxide (nc-SiO<sub>x</sub>:H) layers exhibit promising optoelectrical properties for carrier-selective-contacts in silicon heterojunction (SHJ) solar cells. However, achieving high conductivity while preserving crystalline silicon (c-Si) passivation quality is technologically challenging for growing thin...
journal article 2020
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Mazzarella, L. (author), Morales-Vilches, Anna B. (author), Korte, Lars (author), Schlatmann, Rutger (author), Stannowski, Bernd (author)
Doped hydrogenated nanocrystalline (nc-Si:H) and silicon oxide (nc-SiO<sup>x</sup>:H) materials grown by plasma-enhanced chemical vapor deposition have favourable optoelectronic properties originated from their two-phase structure. This unique combination of qualities, initially, led to the development of thin-film Si solar cells allowing the...
journal article 2020
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Overes, Bart (author)
Micro-/nanoimprint lithography is a high-throughput, high-resolution, and low-cost mass production fabrication process often used for creating microfluidic devices and optical components. In the imprint lithography process, a surface pattern of a stamp is replicated into a material by mechanical contact and three dimensional material...
master thesis 2018
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Karewar, S.V. (author), Gupta, N. (author), Groh, S. (author), Martinez, E. (author), Caro, A. (author), Srinivasan, S.G. (author)
Addition of solutes such as lithium enhances ductility of hexagonal-close-packed (hcp) magnesium (Mg). However, the atomistic underpinning of Li addition on individual deformation mechanisms remain unclear and is the focus of the present work. We compared the deformation mechanisms in nanocrystalline (NC) and single crystal simulation systems...
journal article 2017
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Samaee, M. (author), Najafi, S. (author), Eivani, A. R. (author), Jafarian, H. R. (author), Zhou, J. (author)
In this research, grain refinement through severe plastic deformation (SPD) in combination with a thermal treatment to create a fine initial grain structure with a high degree of supersaturation was taken as a viable approach to achieving simultaneous increases in the hardness, strength and ductility of the aluminum alloy AA6063 during...
journal article 2016
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Apte, A.A. (author)
The low conversion efficiency of thin-film silicon solar cells currently prevents them from competing, commercially, with the dominant crystalline silicon technology. The small thickness of the photo-active layer in thin-film silicon solar cells is an advantage for reducing raw material consumption and increasing industrial throughput, but...
master thesis 2015
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Seshan, V. (author)
Natural diamond is one of the most rare and precious gemstones known to mankind. In addition, it is also known for its exceptional material properties including extreme heat conducting capacity at room temperature, chemical inertness to aqueous environments and excellent electrical insulation that are interesting to both fundamental as well as...
doctoral thesis 2014
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Agbo, S.N. (author)
The need for electrical energy is growing fast as a result of the expanding world population and economic activities. On top of this the energy need of each individual is also growing. At present the growth in energy demand is not matched by the growth in energy generation because of insufficient energy production. This energy gap therefore...
doctoral thesis 2012
Searched for: subject%3A%22nanocrystalline%22
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