• Login
    Search 
    •   Home
    • Academic Divisions
    • Physical Sciences & Engineering (PSE)
    • Materials Science and Engineering Program
    • Search
    •   Home
    • Academic Divisions
    • Physical Sciences & Engineering (PSE)
    • Materials Science and Engineering Program
    • Search
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Filter by Category

    AuthorAlshareef, Husam N. (192)Schwingenschlögl, Udo (145)Zhang, Xixiang (90)Amassian, Aram (86)Bakr, Osman (59)View MoreDepartment
    Materials Science and Engineering Program (909)
    Physical Sciences and Engineering (PSE) Division (746)KAUST Solar Center (KSC) (243)Computational Physics and Materials Science (CPMS) (117)Imaging and Characterization Core Lab (114)View MoreJournalApplied Physics Letters (39)Advanced Materials (34)ACS Applied Materials & Interfaces (25)Nanoscale (25)ACS Nano (23)View MoreKAUST Grant NumberBAS/1/1664-01-01 (5)BAS/1/1614-01-01 (3)CRG_R2_13_BEAU_KAUST_1 (3)BAS/1/1664-01-07 (2)CRF-2015-2549-CRG4 (2)View MorePatent StatusPublished Application (6)Granted Patent (1)PublisherAmerican Chemical Society (ACS) (164)Wiley-Blackwell (137)Elsevier BV (131)Royal Society of Chemistry (RSC) (116)AIP Publishing (51)View MoreSubjectphotovoltaics (10)Graphene (9)Supercapacitor (9)Atom probe tomography (7)Density functional theory (7)View MoreThesis/Dissertation AdvisorAlshareef, Husam N. (2)Bakr, Osman (2)Da Costa, Pedro M. F. J. (2)Schwingenschlögl, Udo (2)Beaujuge, Pierre (1)View MoreThesis/Dissertation ProgramMaterials Science and Engineering (14)TypeArticle (830)Conference Paper (45)Dissertation (11)Patent (7)Poster (6)View MoreYear (Issue Date)2018 (109)2017 (79)2016 (84)2015 (149)2014 (181)View MoreItem AvailabilityMetadata Only (605)Open Access (264)Embargoed (40)

    Browse

    All of KAUSTCommunitiesTitleAuthorsKAUST AuthorsIssue DateSubmit DateSubjectsThis CollectionTitleAuthorsKAUST AuthorsIssue DateSubmit DateSubjects

    My Account

    Login

    Quick Links

    Open Access PolicyORCID LibguidePlumX LibguideSubmit an Item

    Statistics

    Display statistics
     

    Search

    Show Advanced FiltersHide Advanced Filters

    Filters

    Now showing items 1-10 of 909

    • List view
    • Grid view
    • Sort Options:
    • Relevance
    • Title Asc
    • Title Desc
    • Issue Date Asc
    • Issue Date Desc
    • Results Per Page:
    • 5
    • 10
    • 20
    • 40
    • 60
    • 80
    • 100

    • 50CSV
    • 50RefMan
    • 50EndNote
    • 50BibTex
    • Selective Export
    • Select All
    • Help
    Thumbnail

    Configurable Resistive Switching between Memory and Threshold Characteristics for Protein-Based Devices

    Wang, Hong; Du, Yuanmin; Li, Yingtao; Zhu, Bowen; Leow, Wan Ru; Li, Yuangang; Pan, Jisheng; Wu, Tao; Chen, Xiaodong (Wiley, 2015-05)
    The employ of natural biomaterials as the basic building blocks of electronic devices is of growing interest for biocompatible and green electronics. Here, resistive switching (RS) devices based on naturally silk protein with configurable functionality are demonstrated. The RS type of the devices can be effectively and exactly controlled by controlling the compliance current in the set process. Memory RS can be triggered by a higher compliance current, while threshold RS can be triggered by a lower compliance current. Furthermore, two types of memory devices, working in random access and WORM modes, can be achieved with the RS effect. The results suggest that silk protein possesses the potential for sustainable electronics and data storage. In addition, this finding would provide important guidelines for the performance optimization of biomaterials based memory devices and the study of the underlying mechanism behind the RS effect arising from biomaterials. Resistive switching (RS) devices with configurable functionality based on protein are successfully achieved. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
    Thumbnail

    Dipole controlled metal gate with hybrid low resistivity cladding for gate-last CMOS with low Vt

    Hinkle, Christopher L.; Galatage, Rohit V.; Chapman, Richard A.; Vogel, Eric M.; Alshareef, Husam N.; Freeman, Clive M.; Wimmer, Erich; Niimi, Hiroaki; Li-Fatou, Andrei V.; Shaw, Judy B.; Chambers, James J. (Institute of Electrical and Electronics Engineers (IEEE), 2010-06)
    In this contribution, NMOS and PMOS band edge effective work function (EWF) and correspondingly low Vt are demonstrated using standard fab materials and processes in a gate-last scheme. For NMOS, the use of an Al cladding layer results in Vt = 0.08 V consistent with NMOS EWF = 4.15 eV. Migration of the Al cladding into the TiN and a relatively low oxygen concentration near the TiN/HfO2 interface are responsible for the low EWF. For PMOS, employing a W cladding layer along with a post-TiN anneal in an oxidizing ambient results in elevated oxygen concentration near the TiN/HfO2 interface and Vt = -0.20 V consistent with a PMOS EWF = 5.05 eV. First-principles calculations indicate N atoms displaced from the TiN during the oxidizing anneal form dipoles at the TiN/HfO2 interface that play a critical role in determining the PMOS EWF. © 2010 IEEE.
    Thumbnail

    Direct structural mapping of organic field-effect transistors reveals bottlenecks to carrier transport

    Li, Ruipeng; Ward, Jeremy W.; Smilgies, Detlef Matthias; Payne, Marcia M.; Anthony, John Edward; Jurchescu, Oana D.; Amassian, Aram (Wiley-Blackwell, 2012-08-10)
    X-ray microbeam scattering is used to map the microstructure of the organic semiconductor along the channel length of solution-processed bottom-contact OFET devices. Contact-induced nucleation is known to influence the crystallization behavior within the channel. We find that microstructural inhomogeneities in the center of the channel act as a bottleneck to charge transport. This problem can be overcome by controlling crystallization of the preferable texture, thus favoring more efficient charge transport throughout the channel. © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
    Thumbnail

    MOF-derived Co-doped nickel selenide/C electrocatalysts supported on Ni foam for overall water splitting

    Ming, Fangwang; Liang, Hanfeng; Shi, Huanhuan; Xu, Xun; Mei, Gui; Wang, Zhoucheng (Royal Society of Chemistry (RSC), 2016-09-01)
    It is of prime importance to develop dual-functional electrocatalysts with good activity for overall water splitting, which remains a great challenge. Herein, we report the synthesis of a Co-doped nickel selenide (a mixture of NiSe and NiSe)/C hybrid nanostructure supported on Ni foam using a metal-organic framework as the precursor. The resulting catalyst exhibits excellent catalytic activity toward the oxygen evolution reaction (OER), which only requires an overpotential of 275 mV to drive a current density of 30 mA cm. This overpotential is much lower than those reported for precious metal free OER catalysts. The hybrid is also capable of catalyzing the hydrogen evolution reaction (HER) efficiently. A current density of -10 mA cm can be achieved at 90 mV. In addition, such a hybrid nanostructure can achieve 10 and 30 mA cm at potentials of 1.6 and 1.71 V, respectively, along with good durability when functioning as both the cathode and the anode for overall water splitting in basic media.
    Thumbnail

    Electronic structures and stability of Ni/Bi2Te3 and Co/Bi2Te3 interfaces

    Xiong, Ka; Wang, Weichao; Alshareef, Husam N.; Gupta, Rahul P.; White, John B.; Gnade, Bruce E.; Cho, Kyeongjae (IOP Publishing, 2010-03-04)
    We investigate the electronic structures and stability for Ni/Bi 2Te3, NiTe/Bi2Te3, Co/Bi 2Te3 and CoTe2/Bi2Te3 interfaces by first-principles calculations. It is found that the surface termination strongly affects the band alignment. Ni and Co are found to form Ohmic contacts to Bi2Te3. The interface formation energy for Co/Bi2Te3 interfaces is much lower than that of Ni/Bi2Te3 interfaces. Furthermore, we found that NiTe on Bi2Te3 is more stable than Ni, while the formation energies for Co and CoTe2 on Bi2Te3 are comparable. © 2010 IOP Publishing Ltd.
    Thumbnail

    Electrical performance of polymer ferroelectric capacitors fabricated on plastic substrate using transparent electrodes

    Bhansali, Unnat Sampatraj; Khan, Yasser; Alshareef, Husam N. (Elsevier BV, 2012-09)
    Polymer-based flexible ferroelectric capacitors have been fabricated using a transparent conducting oxide (ITO) and a transparent conducting polymer (PEDOT:PSS). It is found that the polarization fatigue performance with transparent oxide electrodes exhibits a significant improvement over the polymer electrodes (20% vs 70% drop in polarization after 10 6 cycles). This result can be explained based on a charge injection model that is controlled by interfacial band-offsets, and subsequent pinning of ferroelectric domain walls by the injected carriers. Furthermore, the coercive field (E c) of devices with our polymer electrodes is nearly 40% lower than reported values with similar polymer electrodes. Surprisingly, this difference was found to be related to the dry etching process used to define the top electrodes, which is reported for the first time by this group. The temperature dependence of relative permittivity of both devices shows a typical first order ferroelectric-to-paraelectric phase transition, but with a reduced Curie temperature compared to reference devices fabricated on Pt. © 2012 Elsevier B.V. All rights reserved.
    Thumbnail

    Exploring SiSn as channel material for LSTP device applications

    Hussain, Aftab M.; Fahad, Hossain M.; Singh, Nirpendra; Rader, Kelly; Sevilla, Galo T.; Schwingenschlögl, Udo; Hussain, Muhammad Mustafa (Institute of Electrical and Electronics Engineers (IEEE), 2013-06)
    Thumbnail

    Hybrid passivated colloidal quantum dot solids

    Ip, Alex; Thon, Susanna; Hoogland, Sjoerd H.; Voznyy, Oleksandr; Zhitomirsky, David; Debnath, Ratan K.; Levina, Larissa; Rollny, Lisa R.; Carey, Graham H.; Fischer, Armin H.; Kemp, Kyle W.; Kramer, Illan J.; Ning, Zhijun; Labelle, André J.; Chou, Kang Wei; Amassian, Aram; Sargent, E. H. (Springer Nature, 2012-07-29)
    Colloidal quantum dot (CQD) films allow large-area solution processing and bandgap tuning through the quantum size effect. However, the high ratio of surface area to volume makes CQD films prone to high trap state densities if surfaces are imperfectly passivated, promoting recombination of charge carriers that is detrimental to device performance. Recent advances have replaced the long insulating ligands that enable colloidal stability following synthesis with shorter organic linkers or halide anions, leading to improved passivation and higher packing densities. Although this substitution has been performed using solid-state ligand exchange, a solution-based approach is preferable because it enables increased control over the balance of charges on the surface of the quantum dot, which is essential for eliminating midgap trap states. Furthermore, the solution-based approach leverages recent progress in metal:chalcogen chemistry in the liquid phase. Here, we quantify the density of midgap trap states in CQD solids and show that the performance of CQD-based photovoltaics is now limited by electrong-"hole recombination due to these states. Next, using density functional theory and optoelectronic device modelling, we show that to improve this performance it is essential to bind a suitable ligand to each potential trap site on the surface of the quantum dot. We then develop a robust hybrid passivation scheme that involves introducing halide anions during the end stages of the synthesis process, which can passivate trap sites that are inaccessible to much larger organic ligands. An organic crosslinking strategy is then used to form the film. Finally, we use our hybrid passivated CQD solid to fabricate a solar cell with a certified efficiency of 7.0%, which is a record for a CQD photovoltaic device. © 2012 Macmillan Publishers Limited. All rights reserved.
    Thumbnail

    Unfolding a molecular trefoil derived from a zwitterionic metallopeptide to form self-assembled nanostructures

    Zhang, Ye; Zhou, Ning; Shi, Junfeng; Pochapsky, Susan Sondej; Pochapsky, Thomas C.; Zhang, Bei; Zhang, Xixiang; Xu, Bing (Nature Publishing Group, 2015-02-19)
    While used extensively by nature to control the geometry of protein structures, and dynamics of proteins, such as self-organization, hydration forces and ionic interactions received less attention for controlling the behaviour of small molecules. Here we describe the synthesis and characterization of a novel zwitterionic metallopeptide consisting of a cationic core and three distal anionic groups linked by self-assembling peptide motifs. 2D NMR spectra, total correlated spectroscopy and nuclear Overhauser effect spectroscopy, show that the molecule exhibits a three-fold rotational symmetry and adopts a folded conformation in dimethyl sulfoxide due to Coulombic forces. When hydrated in water, the molecule unfolds to act as a self-assembling building block of supramolecular nanostructures. By combining ionic interactions with the unique geometry from metal complex and hydrophobic interactions from simple peptides, we demonstrate a new and effective way to design molecules for smart materials through mimicking a sophisticated biofunctional system using a conformational switch.
    Thumbnail

    Optimizing top precision performance measure of content-based image retrieval by learning similarity function

    Liang, Ru-Ze; Shi, Lihui; Wang, Haoxiang; Meng, Jiandong; Wang, Jim Jing-Yan; Sun, Qingquan; Gu, Yi (IEEE, 2017-04-24)
    In this paper we study the problem of content-based image retrieval. In this problem, the most popular performance measure is the top precision measure, and the most important component of a retrieval system is the similarity function used to compare a query image against a database image. However, up to now, there is no existing similarity learning method proposed to optimize the top precision measure. To fill this gap, in this paper, we propose a novel similarity learning method to maximize the top precision measure. We model this problem as a minimization problem with an objective function as the combination of the losses of the relevant images ranked behind the top-ranked irrelevant image, and the squared Frobenius norm of the similarity function parameter. This minimization problem is solved as a quadratic programming problem. The experiments over two benchmark data sets show the advantages of the proposed method over other similarity learning methods when the top precision is used as the performance measure.
    • 1
    • 2
    • 3
    • 4
    • . . .
    • 91
    DSpace software copyright © 2002-2019  DuraSpace
    Quick Guide | Contact Us | Send Feedback
    Open Repository is a service hosted by 
    Atmire NV
     

    Export search results

    The export option will allow you to export the current search results of the entered query to a file. Different formats are available for download. To export the items, click on the button corresponding with the preferred download format.

    By default, clicking on the export buttons will result in a download of the allowed maximum amount of items. For anonymous users the allowed maximum amount is 50 search results.

    To select a subset of the search results, click "Selective Export" button and make a selection of the items you want to export. The amount of items that can be exported at once is similarly restricted as the full export.

    After making a selection, click one of the export format buttons. The amount of items that will be exported is indicated in the bubble next to export format.