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Erratum: Circuit model in design of THZ transparent electrodes based on two-dimensional arrays of metallic square holes (IEEE transactions on terahertz science and technology (2014) 4:3 (383-390))
, Article IEEE Transactions on Terahertz Science and Technology ; Volume 5, Issue 4 , June , 2015 , Pages 655-656 ; 2156342X (ISSN) ; Mehrany, K ; Shirmanesh, G. K ; Yarmoghaddam, E ; Sharif University of Technology
IEEE Microwave Theory and Techniques Society
2015
Abstract
A circuit model has been proposed for two-dimensional metallic arrays of metallic square holes located on a homogeneous substrate. Although the proposed circuit model holds true, the surface admittance between the metallic hole array and the cover was erroneously calculated since the presence of the cross-polarization terms had been neglected. Furthermore, there have been mistakes in numerical simulation and in analytical calculations based on the presented formulas. The correct formulation is now given, and erroneous figures are replotted
Improving the multi-step fabrication approach of copper nanofiber networks based transparent electrode for achieving superb conductivity and transparency
, Article Materials Research Express ; Volume 6, Issue 9 , 2019 ; 20531591 (ISSN) ; Angizi, S ; Sadrnezhaad, S. K ; Nikzad, M. J ; Sharif University of Technology
Institute of Physics Publishing
2019
Abstract
Transparent Conductive Electrode (TCE), as an essential part of the optoelectronic devices, has become popular owing to its unique properties such as high optical transmittance and conductivity. Among utilized materials for fabrication of TCE, copper nanofibers (NFs)-network have been attracting much attention due to its extraordinary properties such as low sheet resistance, the scalable manufacturing and low-cost fabrication method. However, many challenges exist in the way of multi-step fabrication of network to increase the NFs continuity and consequently, improvement of their electrical conductivity as TCE. Herein, we report a deep investigation of the effective parameters on diameter...
Improving the multi-step fabrication approach of copper nanofiber networks based transparent electrode for achieving superb conductivity and transparency
, Article Materials Research Express ; Volume 6, Issue 9 , 2019 ; 20531591 (ISSN) ; Angizi, S ; Sadrnezhaad, S. K ; Nikzad, M. J ; Sharif University of Technology
Institute of Physics Publishing
2019
Abstract
Transparent Conductive Electrode (TCE), as an essential part of the optoelectronic devices, has become popular owing to its unique properties such as high optical transmittance and conductivity. Among utilized materials for fabrication of TCE, copper nanofibers (NFs)-network have been attracting much attention due to its extraordinary properties such as low sheet resistance, the scalable manufacturing and low-cost fabrication method. However, many challenges exist in the way of multi-step fabrication of network to increase the NFs continuity and consequently, improvement of their electrical conductivity as TCE. Herein, we report a deep investigation of the effective parameters on diameter...
Fabrication of Transparent Electrode by Metallic Nanofibers
, M.Sc. Thesis Sharif University of Technology ; Sadrnezhad, Khatiboleslam (Supervisor)
Abstract
Transparent conductive electrode (TCE) is one of the indispensable constituent of optoelectronic devices, which heretofore various materials such as ITO, graphene, CNT, metal nanowire and nanofiber network have been used to produce them. It should also be assumed that the use of low-cost materials, which has cost-effective production method, is essential for the construction of transparent electrodes. Copper nanofiber network film which is obtained from electrospinning process is a promising candidate among these materials because it has superiorities, such as low sheet resistance, proper flexibility and abundance in ground resources, scalable and cost-effective fabrication method. There are...
Design of Metamaterials for Transparent Electrodes, Anti-Reflection Coating, and Light Trapping Structures
, M.Sc. Thesis Sharif University of Technology ; Mehrany, Khashayar (Supervisor) ; Khavasi, Amin (Co-Advisor)
Abstract
In several electro-optic and optoelectronic devices, we require the structures with simultaneous high electrical conductivity and optical transparency so as to transmit the incident light. Transparent Conductive Electrodes (TCEs) that are both highly conductive and transparent were introduced to be an answer to the mentioned challenge. Periodic arrays of metallic holes are amongst the most important structures that are used as transparent electrodes. Using the metals with low electrical resistivity, such as Au and Ag, provides these structures with high electrical conductance. On the other hand, since these micro/nano structures support the propagation of guided electromagnetic waves, light...
Synthesis and Characterization of ZnO for Electron Transport Layer in Perovskite and CIGS Solar Cells
, M.Sc. Thesis Sharif University of Technology ; Taghavinia, Nima (Supervisor) ; Dehghani, Mehdi (Supervisor)
Abstract
The purpose of this study is the fabrication and characterization of ZnO nano particles and the application of ZnO in solar cells. Therefore, firstly we fabricate the high stable solution of ZnO nano particles and then characterize ZnO nano particles. In addition, we study sulfurzation and selenization of zinc oxide thin films. We use ZnO nano particles for fabrication of transparent conductive films. Transparent conductive films have many applications such as touch panels, displays and solar cells. The most applicable transparent conductive electrode is indium tin oxide , which is the most expensive layer in solar cells. But silver nanowires has some challenges such as high surface...
Circuit model in design of THz transparent electrodes based on two-dimensional arrays of metallic square holes
, Article IEEE Transactions on Terahertz Science and Technology ; Vol. 4, issue. 3 , April , 2014 , p. 383-390 ; Yarmoghaddam, E ; Khavasi, A ; Mehrany, K ; Sharif University of Technology
Abstract
In this paper, we propose a circuit model for two-dimensional arrays of metallic square holes located on a homogeneous substrate, in order to propose a new scheme containing this type of metamaterials to obtain transparent electrodes with simultaneous terahertz transparency and low electrical resistance. The results of the introduced circuit model, which is a fully analytical model with explicit expressions, are in almost complete agreement with the full-wave simulations. Thanks to this analytical model, we can employ standard binomial matching transformer in order to minimize the reflected power from the structure at a desired frequency. Furthermore, taking advantage of this model, we...
The role of mixed reaction promoters in polyol synthesis of high aspect ratio ag nanowires for transparent conducting electrodes
, Article Journal of Electronic Materials ; Volume 49, Issue 8 , 2020 , Pages 4822-4829 ; Khosravi, A ; Dehghani, M ; Tajabadi, F ; Taghavinia, N ; Sharif University of Technology
Springer
2020
Abstract
In recent years, thin silver nanowires (Ag NWs) with diameters smaller than 150 nm have been synthesized by implementation of NaCl or FeCl3 as reaction promoters and high molecular weight polyvinylpyrrolidone (PVP) as the capping agent. However, the yield of Ag NWs still remains low, mostly due to the insufficient aspect ratio (AR) of the synthesized nanostructures and the production of Ag nanoparticles, which is an undesirable by product. This study proposes a modified technique to alleviate the problem by using a mixture of FeCl3/CuCl2 as the reaction promoter and two different types of PVP with molecular weight of 360 k and 40 k as the capping agents. The appropriate mixtures of...
Geometrical optimization for silver nanowire mesh as a flexible transparent conductive electrode
, Article Applied Optics ; Volume 59, Issue 10 , 2020 , Pages 3073-3080 ; Mahdavi, S. M ; Sadrnezhaad, S. K ; Sharif University of Technology
OSA - The Optical Society
2020
Abstract
We report the effect of the geometric parameters on transparency and conductivity in a metallic nanowire mesh as a transparent electrode. Today, indium tin oxide and fluorine-doped tin oxide are used as the transparent electrode for displays and solar cells. Still, there is a definite need for their replacement due to drawbacks such as brittleness, scarcity, and adverse environmental effects. Metallic nanowire mesh is likely the best replacement option, but the main issue is how to find the optimal structure and how to get the best performance. Since the interaction of light with nanowire mesh is complicated, there is no straightforward rule with a simple analytical solution. We developed a...