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    Effect of crystallinity and morphology of TiO2 nano-structures on TiO2:P3HT hybrid photovoltaic solar cells

    , Article Applied Solar Energy (English translation of Geliotekhnika) ; Volume 51, Issue 1 , January , 2015 , Pages 34-40 ; 0003701X (ISSN) Boroomandnia, A ; Kasaeian, A. B ; Nikfarjam, A ; Akbarzadeh, A ; Mohammadpour, R ; Sharif University of Technology
    Allerton Press Incorporation  2015
    A comparative study has been made of hybrid solar cells based on poly(3-hexylthiophene) (P3HT) and different nano-structures of TiO2. Electrospinning, which is a low cost production method for large area nanofibrous films, was employed to fabricate TiO2 nanofibers and spin coating method was employed to fabricate organic-inorganic hybrid solar cells based on P3HT and TiO2 nanostructures. The performance of the hybrid solar cells was analyzed for four density levels of the TiO2 nanostructure. It was found that higher densities of TiO2 leads to more interface area and generates excitons, so that the power conversion efficiency increases to... 

    A two-step spin-spray deposition processing route for production of halide perovskite solar cell

    , Article Thin Solid Films ; Volume 616 , 2016 , Pages 754-759 ; 00406090 (ISSN) Mohammadian, N ; Alizadeh, A. H ; Moshaii, A ; Gharibzadeh, S ; Alizadeh, A ; Mohammadpour, R ; Fathi, D ; Sharif University of Technology
    Elsevier B.V 
    We report on fabrication of halide perovskite solar cells using a two-step spin-spray coating rout. The applied method is one of the most straight forward procedures for fabricating uniform stoichiometry and crystalline perovskite cells. To fabricate a high quality perovskite layer, various concentrations of methyl-ammonium iodide (CH3NH3I) were sprayed on a spin coated PbI2 layer using a simple airbrush gun. The characterization results indicate that the size of cuboid perovskite morphology depends on the concentration of methylammonium iodide in the spray procedure. The photovoltaic performance of the fabricated solar cells has been measured and a high dependency on the cuboid sizes was... 

    Ag doping of organometal lead halide perovskites: morphology modification and p-type character

    , Article Journal of Physical Chemistry C ; Volume 121, Issue 7 , 2017 , Pages 3673-3679 ; 19327447 (ISSN) Shahbazi, S ; Tsai, C. M ; Narra, S ; Wang, C. Y ; Shiu, H. S ; Afshar, S ; Taghavinia, N ; Wei Guang Diau, E. ? ; Sharif University of Technology
    We report a simple synthetic approach to grow uniform CH3NH3PbI3 perovskite (PSK) layers free of pinholes via varied portions of silver iodide (AgI) added to the precursor solution. XRD/EDS elemental mapping experiments demonstrated nearly uniform Ag distribution inside the perovskite film. When the 1% AgI-assisted perovskite films were fabricated into a p-i-n planar device, the photovoltaic performance was enhanced by ∼30% (PCE increased from 9.5% to 12.0%) relative to the standard cell without added AgI. Measurement of electronic properties using a hall setup indicated that perovskite films show p-type character after Ag doping, whereas the film is n-type without Ag. Transients of... 

    New organic dyes with diphenylamine core for dye-sensitized solar cells

    , Article Journal of Materials Science: Materials in Electronics ; Volume 29, Issue 8 , April , 2018 , Pages 6323-6336 ; 09574522 (ISSN) Salimi Beni, A. R ; Karami, M ; Hosseinzadeh, B ; Ghahary, R ; Sharif University of Technology
    Springer New York LLC  2018
    In the current investigation, four novel donoracceptor type organic dyes including (DPA-Ba, DPA-Hy, DPA-Rh, DPA-Cy), are proposed and their photophysical and electrochemical properties as well as dye-sensitized solar cell performance are systematically investigated. Among these dyes diphenylamine is utilized as an-electron donor while barbituric acid, hydantoin, rhodanine-n-acetic acid and cyano acetic acid, are proposed as anchoring groups as dye-sensitized solar cells (DSSCs). The synthesized dyes are characterized using FT-IR, NMR, mass spectrometry, absorbance and electrochemical measurements. The photophysical, electrochemical and photovoltaic properties of the solar cells based on... 

    Design, synthesis and application of imidazole-based organic dyes in dye sensitized solar cells

    , Article Journal of Electronic Materials ; Volume 49, Issue 6 , 2020 , Pages 3735-3750 Nabavi, S. M. J ; Alinezhad, H ; Hosseinzadeh, B ; Ghahary, R ; Tajbakhsh, M ; Sharif University of Technology
    Springer  2020
    Metal-free D–D–π–A type dyes (i.e., Car-Cy, Car-Rh, Dpa-Cy, and Dpa-Rh) were designed and synthesized for dye-sensitized solar cells (DSSCs). In the structure of the sensitized dyes, an imidazole ring is connected to a carbazole or diphenylamine moiety as a donor while cyanoacetic acid or rhodanine-3-acetic acid was introduced as an acceptor/anchor. The molecular structures of D–D–π–A type dyes were characterized using IR, NMR and MS spectral data. The optical, electrochemical, theoretical, light harvesting property, HOMO/LUMO levels, redox behavior, and photovoltaic properties of the synthesized dyes were evaluated. Among the fabricated photovoltaic devices based on the prepared dye, Dpa-Cy... 

    Design and analysis of an innovative light tracking device based on opto-thermo-electro-mechanical actuators

    , Article Microelectronic Engineering ; Vol. 119 , May , 2014 , pp. 37-43 ; ISSN: 01679317 Mahmoudpour, M ; Zabihollah, A ; Vesaghi, M ; Kolbadinejad, M ; Sharif University of Technology
    This research presents an application of transparent lanthanum-modified lead zirconate titanate (PLZT) materials in micro light source tracking device, which is designed to function as a result of irradiation, having neither lead wires nor electric circuits. The focus of the paper is on the analytical and finite element investigation into ultraviolet photo-induced multi-physics responses of PLZT photocantilever and a comparison of the measured bending displacement to check the feasibility of these materials in design of micro light source tracking device. The finite element formulation of the transverse deflection for multi-physics analysis of PLZT ceramics by including the photovoltaic and... 

    A lifetime improved single phase grid connected photovoltaic inverter

    , Article 2012 3rd Power Electronics and Drive Systems Technology, PEDSTC 2012, 15 February 2012 through 16 February 2012 ; February , 2012 , Pages 234-238 ; 9781467301114 (ISBN) Mirzahosseini, R ; Tahami, F ; Sharif University of Technology
    In this paper, a reliable low power single phase grid-connected inverter for photovoltaic modules is proposed. The inverter has improved lifetime since large electrolytic capacitor is replaced with small film capacitor due to circuit topology, power processing and proper control scheme. Thus the main limiting component in single phase grid connected inverters is obviated. The proposed inverter consists of two power processing stages. First a dual active bridge (DAB) converter boosts the voltage of PV panel to approximately 440 V and eliminates impact of high dc bus voltage ripples. A proper feed forward control is proposed to regulate the dc bus voltage with high ripple. Simulation results... 

    Plasmonic effects of infiltrated silver nanoparticles inside TiO2 film: Enhanced photovoltaic performance in DSSCs

    , Article Journal of the American Ceramic Society ; Volume 99, Issue 1 , 2016 , Pages 167-173 ; 00027820 (ISSN) Andaji Garmaroudi, Z ; Mohammadi, M. R ; Sharif University of Technology
    Blackwell Publishing Inc 
    The plasmonic effects of infiltrated silver (Ag) nanoparticles, with different contents, inside a nanostructured TiO2 film on the photovoltaic performance of dye-sensitized solar cells (DSSCs) are explored. The synthesized Ag nanoparticles are immobilized onto deposited TiO2 nanoparticles by a new strategy using 3-mercaptopropionic acid (MPA), a bifunctional linker molecule. Transmission electron microscope (TEM) images show that monodispersed Ag and polydispersed TiO2 nanoparticles have an average diameter of 12 ± 3 nm and 5 ± 1 nm, respectively. Moreover, Fourier transform infrared spectroscopy (FTIR) analysis reveals that Ag nanoparticles were successfully functionalized and capped with... 

    Surface engineering of pbs colloidal quantum dots using atomic passivation for photovoltaic applications

    , Article 8th International Conference on Materials for Advanced Technologies, 28 June 2015 through 3 July 2015 ; Volume 139 , 2016 , Pages 117-122 ; 18777058 (ISSN) Tavakoli, M. M ; Sharif University of Technology
    Elsevier Ltd 
    Solution-processed quantum dots (QDs) have attracted significant attention for the low-cost fabrication of optoelectronic devices. Here, we synthesized PbS QDs via hot injection method and passivated the trap states by using short thiols and dopant elements for photovoltaic application. In order to study the effect of dopants on photovoltaic application, PbS QDs were doped by using three different cations: Cadmium, Calcium, and Zinc. We utilized Time resolvel Photoluminescence measurement to study the carriers lifetime for different samples and found that the carriers life time increases ∼80% by using Cd as a dopant compared with undoped sample. In addition, the results of J-V measurement... 

    Optimization of photovoltaic electrolyzer hybrid systems; taking into account the effect of climate conditions

    , Article Energy Conversion and Management ; Volume 118 , 2016 , Pages 438-449 ; 01968904 (ISSN) Sayedin, F ; Maroufmashat, A ; Sattari, S ; Elkamel, A ; Fowler, M ; Sharif University of Technology
    Elsevier Ltd  2016
    Solar energy will make a valuable contribution for power generation in the future. However the intermittency of solar energy has become an important issue in the utilization of PV system, especially small scale distributed solar energy conversion systems. The issue can be addressed through the management of production and storage of the energy in the form of hydrogen. The hydrogen can be produced by solar photovoltaic (PV) powered electrolysis of water. The amount of transferred energy to an electrolyzer from a PV module is a function of the distance between maximum power points (MPP) of PV module and the electrolyzer operating points. The distance can be minimized by optimizing the number... 

    Improved performance of low cost CuInS2 superstrate-type solar cells using Zinc assisted spray pyrolysis processing

    , Article Journal of Physics D: Applied Physics ; Volume 50, Issue 48 , 2017 ; 00223727 (ISSN) Cheshme Khavar, A. H ; Mahjoub, A. R ; Taghavinia, N ; Sharif University of Technology
    Superstrate configuration CuInS2 (CIS) solar cells are fabricated using a spray pyrolysis method. We avoided selenization process, cyanide etching and CdS buffer layer, to keep the process 'green'. CIS layers are formed by spray pyrolysis of an aqueous precursor ink containing metal chloride salts and thiourea at 350 °C. We investigated the effect of intentional Zn doping on structural, morphological and photovoltaic response of the fabricated CIS films by dissolving ZnCl2 in aqueous precursor solution. At a zinc doping level ranging between 0.25 and 1.00 mol%, Zn doping is found to improve the CIS crystal growth and surface morphology of CIS films. Compared with the performance of the... 

    Interfacial investigation on printable carbon-based mesoscopic perovskite solar cells with niox/c back electrode

    , Article ACS Applied Materials and Interfaces ; Volume 9, Issue 30 , 2017 , Pages 25204-25215 ; 19448244 (ISSN) Behrouznejad, F ; Tsai, C. M ; Narra, S ; Diau, E. W. G ; Taghavinia, N ; Sharif University of Technology
    American Chemical Society  2017
    Solar cells with high efficiency, low cost, and high stability are the target for the new generation of solar cells. A fully printable perovskite (CH3NH3PbI3) solar cell (PSC) with device architecture FTO/TiO2/Al2O3/NiOx/C is fabricated in the current research as a low-cost and relatively stable structure and is investigated to determine how different fabrication factors such as the thickness of the insulating spacer layer (Al2O3) or treatments such as heat and UV-O3 treatments can affect the interfacial properties of this multilayer mesoporous structure. X-ray photoelectron spectra (XPS) show that UV-O3 treatment increases the Ni3+(Ni2O3) phase on the surface of the black nickel oxide layer... 

    Low-temperature solution-based processing to 7.24% efficient superstrate CuInS2 solar cells

    , Article Solar Energy ; Volume 157 , 2017 , Pages 581-586 ; 0038092X (ISSN) Cheshme Khavar, A.H ; Mahjoub, A. R ; Taghavinia, N ; Sharif University of Technology
    Elsevier Ltd  2017
    The fabrication of high performance, solution-processed CIGS family solar cells is based on high-temperature crystallization processes in chalcogen-containing atmosphere and/or using dangerous solvents like hydrazine. The non-hydrazine sulfurization- and selenization-free reports typically suffer from poor grain structures. We report a facile strategy to overcome grain growth limitations at very low temperature processing (250 °C). Selenium free Superstrate configuration CuInS2 (CIS) solar cells are fabricated using a nanocrystals ink which avoiding from high temperature selenization or/and sulfurization is targeted. We investigated the effect of intentional M doping (M = Sb, Zn, Cd and Sn)... 

    Analytical study of electro-elastic fields in quantum nanostructure solar cells: the inter-nanostructure couplings and geometrical effects

    , Article Acta Mechanica ; Volume 229, Issue 7 , 2018 , Pages 3089-3106 ; 00015970 (ISSN) Rashidinejad, E ; Naderi, A. A ; Sharif University of Technology
    Springer-Verlag Wien  2018
    Recent investigations on multifunctional piezoelectric semiconductors have shown their excellent potential as photovoltaic components in high-efficiency third-generation quantum nanostructure (QNS) solar cells. The current work is devoted to studying the electro-elastic behavior of high-density QNS photovoltaic semiconductors within which initial mismatch strains of arrays of quantum dots (QDs) or quantum wires (QWRs) induce coupled electro-mechanical fields. The inter-nanostructure couplings which are of great importance in high-density QNS arrays are incorporated in the presented analytical framework. In practice, QNSs with different geometries such as spherical, cuboidal, or pyramidal QDs... 

    Numerical investigation of the effects of a copper foam filled with phase change materials in a water-cooled photovoltaic/thermal system

    , Article Energy Conversion and Management ; Volume 163 , 2018 , Pages 187-195 ; 01968904 (ISSN) Mousavi, S ; Kasaeian, A ; Shafii, M. B ; Jahangir, M. H ; Sharif University of Technology
    Elsevier Ltd  2018
    The purpose of the present study is to investigate the thermal performance of a photovoltaic/thermal system, integrated with phase change materials in porous medium. For this purpose, a metal foam was employed as porous medium and the performance of five different PCMs, as organic and inorganic, were examined as well. Moreover, the effects of different key parameters such as the mass flow rate, solar irradiance, inlet water temperature and inclination were studied. Finally, the simulation results were compared with a water-cooled photovoltaic/thermal without incorporating PCMs and porous medium, and thermal performance of the three PV/T cases were reported. The highest thermal efficiency of... 

    Experimental analysis of a cooling system effect on photovoltaic panels’ efficiency and its preheating water production

    , Article Renewable Energy ; 2018 ; 09601481 (ISSN) Fakouriyan, S ; Saboohi, Y ; Fathi, A ; Sharif University of Technology
    Elsevier Ltd  2018
    This paper addresses a low complexity and high efficient cooling system applicable on photovoltaic (PV) system leading to enhance electrical efficiency and provide preheated water. The developed system consists of a photovoltaic panel, a cooling water system establishing a uniform surface temperature, and a solar water heater. According to the proposed system characteristics, the setup is constructed based on a single mono-crystalline solar panel to absorb more solar radiation intensity and generate more electrical energy per area in compare to a poly-crystalline panel. The preheated water produced by absorbed heat from the photovoltaic is conducted to a solar water heater to satisfy... 

    A Rapid synthesis of vertically aligned taper-like k-doped zno nanostructures to enhance dye-sensitized solar cell efficiency

    , Article JOM ; Volume 71, Issue 12 , 2019 , Pages 4850-4856 ; 10474838 (ISSN) Sharifi Miavaghi, A ; Musavi, M ; Nanchian, H ; Pezeshkzadeh, S. A ; Sharif University of Technology
    Springer  2019
    Large-scale K-doped ZnO nanotapers were successfully grown on an indium tin oxide (ITO) substrate using a facile electrochemical route. The structural and morphologic analysis exhibited that the K-doped ZnO nanostructures had a nanotaper morphology and strong preferential [0001] c-axis direction with a hexagonal polycrystalline structure. The optical results show that the incorporation of K+ ions as the donors in a ZnO lattice leads to substantial modulation of the band gap structure of ZnO nanotapers, which results in a redshift in the ultraviolet emission peaks. The considerable enhancement of performance in K-doped ZnO-based dye-sensitized solar cells (DSSCs) can be related to the doping... 

    Effect of ZnO nanoparticles coating layers on top of ZnO nanowires for morphological, optical, and photovoltaic properties of dye-sensitized solar cells

    , Article Micromachines ; Volume 10, Issue 12 , 2019 ; 2072666X (ISSN) Saleem, M ; Farooq, W. A ; Iftikhar Khan, M ; Niaz Akhtar, M ; Rehman, S. U ; Ahmad, N ; Khalid, M ; Atif, M ; AlMutairi, M. A ; Irfan, M ; Sharif University of Technology
    MDPI AG  2019
    This paper reports on the synthesis of ZnO nanowires (NWs), as well asthe compound nanostructures of nanoparticles (NPs) and nanowires (NWs+NPs) with different coating layers of NPs on the top of NWs and their integration in dye-sensitized solar cells (DSSCs). In compound nanostructures, NWs offer direct electrical pathways for fast electron transfer, and the NPs of ZnOdispread and fill the interstices between the NWs of ZnO, offering a huge surface area for enough dye anchoring and promoting light harvesting. A significant photocurrent density of 2.64mA/cm2 and energy conversion efficiency of 1.43% was obtained with NWs-based DSSCs. The total solar-to-electric energy conversion efficiency... 

    Designing highly stable yet efficient solar cells based on a new triple-cation quasi-2D/3D hybrid perovskites family

    , Article Ceramics International ; Volume 45, Issue 16 , 2019 , Pages 20788-20795 ; 02728842 (ISSN) Bakhshayesh, A. M ; Abdizadeh, H ; Mirhosseini, M ; Taghavinia, N ; Sharif University of Technology
    Elsevier Ltd  2019
    In a nutshell, this study outlines the efficacy of mixed dimensional (2D/3D) hybrid perovskites by developing a new class of triple-cation quasi-2D perovskites having (S0.97S′0.03)2[Cs0.05(FA0.97MA0.03)0.95]n-1Pbn(I0.07Br0.03)3n+1 general composition, in which a mixture of ý5-ammonium valeric acid ýiodideý (S) and tetra-n-octylammonium ýbromide (S′) was employed ýas a spacer.ý The effect of the 2D and 3D structures molar ratios (i.e., C=2D/2D+3D) in the range of 0-100 % on photovoltaic performance of the deposited photoanodes was systemically studied. Drawing a comparison between such compounds and an analogous triple-cation 3D counterpart (i.e., Cs0.05(FA0.83MA0.17)0.95Pb(I0.83Br0.17)3) as... 

    A numerical study of dust deposition effects on photovoltaic modules and photovoltaic-thermal systems

    , Article Renewable Energy ; Volume 135 , 2019 , Pages 437-449 ; 09601481 (ISSN) Salari, A ; Hakkaki Fard, A ; Sharif University of Technology
    Elsevier Ltd  2019
    Dust deposition on the surface of solar systems is one of the main parameters that significantly affects the performance of such systems. In this study, the effect of dust deposition density on the performance of photovoltaic modules (PV) and photovoltaic-thermal systems (PVT) is numerically investigated. Accordingly, all layers of a monocrystalline silicon PV module for both systems are simulated. Moreover, the effect of various system parameters on the performance of both clean and dusty PV module and PVT system are studied. The studied parameters included: solar radiation intensity, ambient temperature, coolant inlet temperature, and coolant inlet velocity. The obtained results indicate...