1,720,962 research outputs found
Near-Infrared p-i-n Ge-on-Si Photodiodes for Silicon Integrated Receivers
No full textWe investigate and characterize p-i-n near-infrared photodiodes fabricated in Ge-on-Si by reduced-pressure chemical vapor deposition, a technology compatible with silicon processing. The detectors exhibit remarkably low dark current densities of 1mA/cm(2) at unity reverse bias and high responsivities of 200 mA/W at 1.55 mu m. We evaluated their small-signal resistance, capacitance, and bandwidth as well as eye-diagrams at 2.5 and 10 Gbit/s
Low dark-current germanium-on-silicon near-infrared detectors
No full textWe demonstrate near-infrared Ge-on-Si photodiodes designed to minimize the dark current density and fabricated by chemical vapor deposition. The p-i-n detectors exhibit record low dark currents of 7 nA at 1-V reverse bias with responsivities close to the theoretical maximum. An excellent performance is ascertained,even for very low reverse voltages
Low dark-current germanium-on-silicon near-infrared detectors
No full textWe demonstrate near-infrared Ge-on-Si photodiodes designed to minimize the dark current density and fabricated by chemical vapor deposition. The p-i-n detectors exhibit record low dark currents of 7 nA at 1-V reverse bias with responsivities close to the theoretical maximum. An excellent performance is ascertained,even for very low reverse voltages
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Germanium-on-Glass solar cells: fabrication and characterization
No full text"We report on Germanium on Glass solar cells realized by wafer bonding, layer splitting and. epitaxial regrowth. We provide a detailed description of the layer transfer process and. discuss the material characterization. The solar cells are fabricated and tested to extract the. most significant figures of merit, evaluating their performance versus device area and. operating temperature. The cells exhibit typical conversion efficiencies exceeding 2.4%. under AM1. 5 irradiation and a maximum efficiency of 3.7% under concentrated excitation.
Germanium-on-glass near-infrared detectors
No full textGe-on-glass photodetectors is fabricated by wafer bonding and layer splitting, followed by the epitaxial growth of pn structures. The detectors exhibit a remarkably low dark current density of 50 mu A/cm(2) at 1 V reverse bias and responsivities as high as 0.33 and 0.43 A/W at 1.52 and 1.3 mu m, respectively. This approach can be readily extended to other substrates, enabling the integration of Ge on different platforms
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Germanium on insulator near-infrared photodetectors fabricated by layer transfer
No full textWe report oil novel pn Ge photodetectors fabricated oil glass The fabrication consists of wafer bonding and layer splitting. followed by a low-temperature epitaxial growth of Ge The photodiodes are characterized in terms of dark current and responsivity, and their performance compared with devices realized on either Ge or Si The minimum current density is 50 mu A/cm(2) at 1 V reverse bias. the responsivity is 0.2 A/W in the photovoltaic mode, with a maximum of 0 28 A/W at 1.55 micron at a reverse voltage of 5 V (C) 2009 Elsevie
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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