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Träfflista för sökning "WFRF:(Borgström S) srt2:(2010-2014)"

Sökning: WFRF:(Borgström S) > (2010-2014)

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2.
  • Muench, S., et al. (författare)
  • Time-resolved photoluminescence investigations on HfO2-capped InP nanowires
  • 2010
  • Ingår i: Nanotechnology. - : IOP Publishing. - 0957-4484 .- 1361-6528. ; 21:10
  • Tidskriftsartikel (refereegranskat)abstract
    • We have employed time-resolved photoluminescence (PL) spectroscopy to study the impact of HfO2 surface capping by atomic layer deposition (ALD) on the optical properties of InP nanowires (NWs). The deposition of high-kappa dielectrics acting as a gate oxide is of particular interest in view of possible applications of semiconductor NWs in future wrap-gated field effect transistors (FETs). A high number of charged states at the NW-dielectrics interface can strongly degrade the performance of the FET which explains the strong interest in high quality deposition of high-kappa dielectrics. In the present work we show that time-resolved spectroscopy is a valuable and direct tool to monitor the surface quality of HfO2-capped InP NWs. In particular, we have studied the impact of ALD process parameters as well as surface treatment prior to the oxide capping on the NW-dielectrics interface quality. The best results in terms of the surface recombination velocity (S-0 = 9.5 x 10(3) cm s(-1)) were obtained for InP/GaP core/shell NWs in combination with a low temperature (100 degrees C) ALD process. While the present report focuses on the InP material system, our method of addressing the surface treatment for semiconductors with high-kappa dielectrics will also be applicable to nanoelectronic devices based on other III/V material systems such as InAs.
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3.
  • Erixon, Hanna, et al. (författare)
  • Challenging dichotomies : exploring resilience as an integrative and operative conceptual framework for large-scale urban green structures
  • 2013
  • Ingår i: Planning Theory & Practice. - : Informa UK Limited. - 1464-9357 .- 1470-000X. ; 14:3, s. 349-372
  • Tidskriftsartikel (refereegranskat)abstract
    • Urban planners and urban planning as a field face a major challenge in balancing urban development interests against the need to safeguard socially equitable and ecologically functional green space. This need is still commonly seen through a modernist lens, whereby large-scale green areas are viewed as an antithesis to the city, creating a polarised landscape seemingly free from cross-scale social and ecological interactions. This study reports on a transdisciplinary work process that aimed to challenge this polarisation by exploring more integrative and operative planning approaches to large-scale urban green structures, using the concept of resilience, both as a theoretical umbrella and in relation to a case study in Stockholm, Sweden. The exploration took the form of a series of workshops in which professionals from the fields of planning, urban design, ecology, landscape architecture, and environmental history, as well as city-wide and regional planning, took part. Throughout the process, tentative designs served as "touchstones", bringing questions from a theoretical level to a hands-on, specific, local context. This paper identifies three ways that resilience science can be useful in the planning and management of large urban green structures. Firstly, resilience can introduce complexity and thus make visible synergies and "win-win" situations within planning. Secondly, in highlighting change, resilience can offer alternatives to present conservationist perspectives on green space planning and thus offer constructive ways out of planning-related deadlocks. Thirdly, resilience can be advantageously combined with the concept of "legibility" in clarifying common goals and thus helping to build a constituency which will sustain large-scale green structures over time.
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