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438 results on '"Deppert, Knut"'

25. Multiscale in modelling and validation for solar photovoltaics

Author

Abu Hamed Tareq, Adamovic Nadja, Aeberhard Urs, Alonso-Alvarez Diego, Amin-Akhlaghi Zoe, Auf der Maur Matthias, Beattie Neil, Bednar Nikola, Berland Kristian, Birner Stefan, Califano Marco, Capan Ivana, Cerne Bostjan, Chilibon Irinela, Connolly James. P., Cortes Juan Frederic, Coutinho Jose, David Christin, Deppert Knut, Donchev Vesselin, Drev Marija, Ehlen Boukje, Ekins-Daukes Nicholas, Even Jacky, Fara Laurentiu, Fuertes Marron David, Gagliardi Alessio, Garrido Blas, Gianneta Violetta, Gomes Maria, Guillemoles Jean-Francois, Guina Mircea, Halme Janne, Hocevar Mateja, Jacak Lucjan, Jacak Witold, Jaksic Zoran, Joseph Lejo k., Kassavetis Spyridon, Kazukauskas Vaidotas, Kleider Jean-Paul, Kluczyk Katarzyna, Kopecek Radovan, Krasovec Ursa Opara, Lazzari Jean-Louis, Lifshitz Efrat, Loncaric Martin, Madsen Søren Peder, Vega Antonio Marti, Mencaraglia Denis, Messing Maria E., Armando Felipe Murphy, Nassiopoulou Androula G., Neijm Ahmed, Nemcsics Akos, Neto Victor, Pedesseau Laurent, Persson Clas, Petridis Konstantinos, Popescu Lacramioara, Pucker Georg, Radovanović Jelena, Rimada Julio C., Ristova Mimoza, Savic Ivana, Savin Hele, Sendova-Vassileva Marushka, Sengul Abdurrahman, Silva José, Steiner Ullrich, Storch Jan, Stratakis Emmanuel, Tao Shuxia, Tomanek Pavel, Tomić Stanko, Tukiainen Antti, Turan Rasit, Ulloa Jose Maria, Wang Shengda, Yuksel Fatma, Zadny Jaroslav, and Zarbakhsh Javad

Subjects
multi-scale modelling, solar cells, third generation photovoltaics, semiconductors, nano structures, device simulation, Renewable energy sources, TJ807-830
Abstract

Photovoltaics is amongst the most important technologies for renewable energy sources, and plays a key role in the development of a society with a smaller environmental footprint. Key parameters for solar cells are their energy conversion efficiency, their operating lifetime, and the cost of the energy obtained from a photovoltaic system compared to other sources. The optimization of these aspects involves the exploitation of new materials and development of novel solar cell concepts and designs. Both theoretical modeling and characterization of such devices require a comprehensive view including all scales from the atomic to the macroscopic and industrial scale. The different length scales of the electronic and optical degrees of freedoms specifically lead to an intrinsic need for multiscale simulation, which is accentuated in many advanced photovoltaics concepts including nanostructured regions. Therefore, multiscale modeling has found particular interest in the photovoltaics community, as a tool to advance the field beyond its current limits. In this article, we review the field of multiscale techniques applied to photovoltaics, and we discuss opportunities and remaining challenges.

Published
2018
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30. Continuous gas-phase synthesis of nanowires with tunable properties

Author

Heurlin, Magnus, Magnusson, Martin H., Lindgren, David, Ek, Martin, Wallenberg, L. Reine, Deppert, Knut, and Samuelson, Lars

Subjects
Gallium arsenide -- Usage -- Optical properties -- Research, Nanotechnology -- Optical properties -- Usage, Environmental issues, Science and technology, Zoology and wildlife conservation
Abstract

Semiconductor nanowires are key building blocks for the next generation of light-emitting diodes (1), solar cells (2) and batteries (3). To fabricate functional nanowire-based devices on an industrial scale requires an efficient methodology that enables the mass production of nanowires with perfect crystallinity, reproducible and controlled dimensions and material composition, and low cost. So far there have been no reports of reliable methods that can satisfy all of these requirements. Here we show how aerotaxy, an aerosol-based growth method (4), can be used to grow nanowires continuously with controlled nanoscale dimensions, a high degree of crystallinity and at a remarkable growth rate. In our aerotaxy approach, catalytic size-selected Au aerosol particles induce nucleation and growth of GaAs nanowires with a growth rate of about 1 micrometre per second, which is 20 to 1,000 times higher than previously reported for traditional, substrate-based growth of nanowires made of group III-V materials (5-7). We demonstrate that the method allows sensitive and reproducible control of the nanowire dimensions and shape--and, thus, controlled optical and electronic properties--through the variation of growth temperature, time and Au particle size. Photoluminescence measurements reveal that even as-grown nanowires have good optical properties and excellent spectral uniformity. Detailed transmission electron microscopy investigations show that our aerotaxy-grown nanowires form along one of the four equivalent (111)B crystallographic directions in the zincblende unit cell, which is also the preferred growth direction for III-V nanowires seeded by Au particles on a single-crystal substrate. The reported continuous and potentially high-throughput method can be expected substantially to reduce the cost of producing high-quality nanowires and may enable the lowcost fabrication of nanowire-based devices on an industrial scale., Semiconductor nanowires are typically grown using a bottomup approach whereby metal particles positioned on top of a single-crystalline substrate enhance growth in one dimension, forming high-aspect-ratio nanostructures (8). The nanowire [...]

Published
2012

40. Professional networking by gender: A case study on LinkedIn contacts for a professor in science

Author

Olsson, Anders, Snellman, Markus, Lövkrona, Inger, and Deppert, Knut

Subjects
bepress|Social and Behavioral Sciences|Communication|Communication Technology and New Media, SocArXiv|Social and Behavioral Sciences|Communication|Gender, Race, Sexuality, and Ethnicity in Communication, bepress|Social and Behavioral Sciences|Social Statistics, bepress|Social and Behavioral Sciences, bepress|Social and Behavioral Sciences|Communication, SocArXiv|Social and Behavioral Sciences, SocArXiv|Social and Behavioral Sciences|Communication, bepress|Social and Behavioral Sciences|Communication|Gender, Race, Sexuality, and Ethnicity in Communication, SocArXiv|Social and Behavioral Sciences|Communication|Social Media, bepress|Social and Behavioral Sciences|Communication|Social Media, SocArXiv|Social and Behavioral Sciences|Social Statistics, SocArXiv|Social and Behavioral Sciences|Communication|Communication Technology and New Media
Abstract

In this study, we used data from LinkedIn networks to gain insight in how different groups network in terms of network size and gender composition among men and women. We have gathered categorical data from 751 LinkedIn networks to quantitatively analyze networking tendencies and network gender compositions in the categories gender, age, sector of work, fi?eld of work, level of education and area of residence. We have also determined networking "savviness" as a quantitative measure of social networking for comparing groups in the categories. The observations made regarding networking behavior among female and male LinkedIn users include that women on average had more female contacts than men in all categories. Female networks working in a non-technical fi?eld were found to have the most gender equal networks of all groups with an average of 42.5% female contacts. The data show further, that men and women in STEM and the private sector were savvier networkers and that users with a PhD had fewer female contacts on average than those without a PhD. Further, Scandinavian networks had signi?cantly more female contacts in their networks than networks from other European countries and North America had.

Published
2020
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