1,721,091 research outputs found
Dataset for "Development of Amorphous Silicon Solar Cells with Plasmonic Light Scattering"
No full textDataset supporting:
Crudgington, Lee, Rahman, Tasmiat and Boden, Stuart (2016) Development of Amorphous Silicon Solar Cells with Plasmonic Light Scattering. Journal of Vacuum Science and Technology B Microelectronics and Nanometer Structures.
This paper reports the result of simulation and fabrication of the optical effects of metallic nano-particle arrays within amorphous silicon thin-films. A finite-difference time domain approach is used to design and model nano-particle arrays within opto-electronic models of thin-film amorphous silicon. An increase in optical scattering is observed, resulting in an increase in power absorption within the material active region and a reduction in optical reflection from the film surface. It is shown that this enhancement in optical performance depends on the particle size, shape, position within the structure and proximity to the metallic back reflector. Process development of metal-island films on silicon and glass, followed by the fabrication and measurement of amorphous silicon P-I-N devices featuring plasmonic nano-particles is demonstrated; showing an enhancement in-keeping with results achieved using simulation.</span
Tip-Enhanced Raman characterization of He-ion-irradiated CVD graphene channels
No full textData to support the paper: Zelai, Taharh, Iwasaki, Takuya, Boden, Stuart, Chong, Harold, Mizuta, H. and Tsuchiya, Yoshishige (2017) Tip-Enhanced Raman characterization of He-ion-irradiated CVD graphene channels. 43rd International Conference on Micro and Nanoengineering, , Braga, Portugal. 18 - 22 Sep 2017.</span
Optimization of moth-eye antireflection schemes for silicon solar cells
Full text linkNanostructured moth-eye antireflection schemes for silicon solar cells are simulated using rigorous coupled wave analysis and compared to traditional thin film coatings. The design of the moth-eye arrays is optimized for application to a laboratory cell (air–silicon interface) and an encapsulated cell (EVA-silicon interface), and the optimization accounts for the solar spectrum incident on the silicon interface in both cells, and the spectral response of both types of cell. The optimized moth-eye designs are predicted to outperform an optimized double layer thin film coating by approximately 2% for the laboratory cell and approximately 3% for the encapsulated cell. The predicted performance of the silicon moth-eye under encapsulation is particularly remarkable as it exhibits losses of only 0.6% compared to an ideal AR surfac
Helium ion beam lithography for sub-10nm pattern definition
No full textAn emerging lithographic technique offers a promising alternative to electron beam lithography for fabricating new semiconductor devices with both traditional and non-traditional resists
Biomimetic nanostructured surfaces for antireflection in photovoltaics
No full textA key consideration in the design of any solar cell is the reduction of reflectance from the top surface. Traditional thin film antireflection schemes are being challenged by new techniques that involve texturing on the subwavelength scale to form ‘moth-eye’ arrays, so called because they are inspired by Nature’s answer to unwanted reflections, the arrays of pillars found on the eyes and wings of some species of moth. In this work, a new method is presented for the optimization of thin film coatings that accounts for the angular and spectral variations in incident solar radiation from sunrise to sunset. This approach is then extended to silicon moth-eye arrays to assess how effectively these surfaces can provide antireflection for silicon solar cells over a full day. The reflectance spectra of moth-eye surfaces are found to depend on the period of the arrays and the height and shape of the pillars, and consequently these parameters can be optimized for the solar spectrum. Simulations predict that replacing an optimized double layer thin film coating with a moth-eye array could increase the full day cell performance by 2% for a laboratory cell and 3% for an encapsulated cell. Compared to a perfectly transmitting interface, this corresponds to losses in short circuit current of only 5.3% and 0.6% for a laboratory and an encapsulated cell, respectively. Furthermore, fabrication of silicon moth-eye arrays by electron beam lithography and dry etching leads to predicted percentage losses at peak irradiance, compared to an
ideal antireflective surface, of only 1%. The potentially more scalable technique of nanoimprint lithography is also used to fabricate antireflective moth-eye arrays in silicon, over areas as large as 1 cm2, demonstrating great potential for stealth
and antiglare applications in addition to photovoltaics
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Introduction: Why relationships matter for mental health
Full text linkIn this brief introductory chapter, we set out our hopes for the book and provide an overview of the chapter structure
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Conceptual Foundations: Relational thinking for mental health contexts
Full text linkWhat we are loosely referring to as ‘relational thinking’ is an assemblage of ideas drawn from extensive literatures across the fields of philosophy, psychology, psychotherapy, sociology and social work that explore what it means to be inter-connected with others; interpersonally, socially, existentially. This chapter will sensitise the reader to relevant relational concepts and ideas, and will contextualise these within the frame of mental health. The chapter starts with existential-phenomenological understandings about the foundational nature of intersubjectivity and our social situation, making connections with feminist care ethics. We go on to look at socio-psychological concepts, such as trust, attachment and intimacy and their importance for understanding distress and recovery, before thinking about how concepts like social capital and stigma help to explain how patterns of distress manifest across our societies. We end by arguing that relational thinking – as a nuanced and pluralistic concept – offers a significant lens for understanding the lived experiences of distress and recovery, and the services and contexts that aim to support mental health and wellbeing
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Clinical Foundations: A brief history of relational practice
Full text linkThis chapter traces a brief history of relational practice in the clinical context of distress and recovery. Starting with psychotherapeutic theory and the centrality of the therapeutic relationship, we explore how relational thinking has, and has not, been taken up by contemporary adult mental health practice and policy. The chapter argues that contemporary conceptions of the person as individual and independent have resulted in services that, on the whole, no longer recognise the essential role of interdependency, nor fully embrace the opportunity that relationships offer for interventions that can make a lasting difference. We look at alternative and innovative examples of relational interventions, including therapeutic communities, Open Dialogue, and peer-led interventions like Hearing Voices groups. We then conclude by considering how well relational thinking has been integrated into mainstream mental health settings and where practice may go from here
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