| 1. |
- Janssen, P., et al.
(författare)
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On the role of minority carriers in the frequency dependence of organic magnetoresistance
- 2011
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Ingår i: Synthetic metals. - : Elsevier. - 0379-6779 .- 1879-3290. ; 161:7-8, s. 617-621
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Tidskriftsartikel (refereegranskat)abstract
- In this work we investigate the frequency dependence of organic magnetoresistance (OMAR) both in small molecule-based (Alq3) and polymer (PPV derivative) materials, and investigate its thickness dependence. For all devices, we observed a strong decrease in magnetoconductance (MC) with increasing frequency of the ac component of the applied magnetic field. Moreover, we observed a strong reduction of the cut-off frequencies for increasing film thickness. By means of admittance spectroscopy and device simulations, we show that the cut-off frequency is related to the inverse transit time of the minority charge carriers. These observations confirm the important role of minority carriers in OMAR, and show that changes in OMAR are not only due to microscopic mechanisms, but also device physics is of significant relevance. (C) 2011 Elsevier B.V. All rights reserved.
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| 2. |
- Avital, Michel, et al.
(författare)
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The collaborative economy : A disruptive innovation or much ado about nothing?
- 2014
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Ingår i: 35th International Conference on Information Systems: Building a Better World Through Information Systems, ICIS 2014. - : Association for Information Systems.
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Tidskriftsartikel (refereegranskat)abstract
- An economy based on the exchange of capital, assets and services between individuals has grown significantly, spurred by proliferation of internet-based platforms that allow people to share underutilized resources and trade with reasonably low transaction costs. The movement toward this economy of "sharing" translates into market efficiencies that bear new products, reframe established services, have positive environmental effects, and may generate overall economic growth. This emerging paradigm, entitled the collaborative economy, is disruptive to the conventional company-driven economic paradigm as evidenced by the large number of peer-to-peer based services that have captured impressive market shares sectors ranging from transportation and hospitality to banking and risk capital. The panel explores economic, social, and technological implications of the collaborative economy, how digital technologies enable it, and how the massive sociotechnical systems embodied in these new peer platforms may evolve in response to the market and social forces that drive this emerging ecosystem.
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