A5043517060- Conducting polymers and applications
- Organic Electronics and Photovoltaics
- Perovskite Materials and Applications
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Thin-Film Transistor Technologies
- Quantum Dots Synthesis And Properties
- Chalcogenide Semiconductor Thin Films
- Force Microscopy Techniques and Applications
- Semiconductor materials and interfaces
- Advanced battery technologies research
- Photonic and Optical Devices
- ZnO doping and properties
- Optical properties and cooling technologies in crystalline materials
- Fullerene Chemistry and Applications
- Organic Light-Emitting Diodes Research
- Electronic Packaging and Soldering Technologies
- Carbon Nanotubes in Composites
- Advanced Fiber Optic Sensors
- Copper-based nanomaterials and applications
- Intermetallics and Advanced Alloy Properties
- Powder Metallurgy Techniques and Materials
- Gas Sensing Nanomaterials and Sensors
- Solid-state spectroscopy and crystallography
Mansoura University
2006-2021
Skolkovo Institute of Science and Technology
2018-2020
Iowa State University
2011-2016
Here we explore the effect of partial substitution univalent methylammonium cations (MA) with hydrazinium ions (HA) on stability, morphology and photovoltaic performance hybrid MA<sub>(1−x)</sub>HA<sub>x</sub>SnI<sub>3</sub> systems.
Structurally different complex bismuth iodides with 1D anionic frameworks were designed and explored as semiconductor materials for photovoltaic devices.
Here, we present a systematic study of the thermal and photochemical degradation pathways for series complex tin-based halides ASnX3 (X = I, Br) with organic (CH3NH3+, H2NCHNH2+) inorganic (Cs+) univalent A-site cations. Thin films perovskites were exposed to continuous light soaking and/or annealing in dark under an inert atmosphere, which simulate pragmatic anoxic operation conditions solar cells absorber layer isolated from (re)action oxygen moisture by appropriate encapsulation. Using...
Over the last decade, polymer solar cells (PSCs) have attracted a lot of attention and highest power conversion efficiencies (PCE) are now close to 10%. Here we employ an optical structure – microlens array (MLA) increase light absorption inside active layer, PCE PSCs increased even for optimized devices. Normal incident rays refracted at MLA travel longer paths layers. Two PSC systems poly(3-hexylthiophene-2,5-diyl):(6,6)-phenyl C61 butyric acid methyl ester (P3HT:PCBM)...
Trap states are well-known to plague organic photovoltaic devices and their characterization is essential for continued progress. This letter reports on both the deep trap profiles kinetics of emission, studied through temperature dependent capacitance measurements. Three polymer based systems relevant photovoltaics, namely, P3HT:PC60BM, PTB7:PC70BM, PCDTBT:PC70BM were investigated. Each showed a markedly different profile, varying in shape from nearly constant density sharp Gaussian. In...
It is known that the operation lifetime of perovskite solar cells can be extended by orders magnitude if properly selected hole‐transport and electron transport layers provide good isolation for absorber preventing evaporation volatile species (e.g., photoinduced) from active layer blocking diffusion aggressive moisture oxygen surrounding environment. Herein, a systematic study family structurally similar fullerene derivatives as (ETL) materials p‐i‐n presented. shown even minor...
The performance of organic photovoltaic devices is improving steadily and efficiencies have now exceeded 10%. However, the incident solar spectrum still largely remains poorly absorbed. To reduce optical losses, we employed a microlens array (MLA) layer on side glass substrate facing light; this approach does not interfere with processing active-layer. We observed up to 10% enhancement in short circuit current...
There is growing evidence that the stability of perovskite solar cells (PSCs) strongly dependent on interface chemistry between absorber films and adjacent charge‐transport layers, whereas exact mechanistic pathways remain poorly understood. Herein, a straightforward approach presented for decoupling degradation effects induced by top fullerene‐based electron transport layer (ETL) various bottom hole‐transport (HTL) materials assembled in p‐i‐n PSCs. It shown chemical interaction MAPbI 3...
To tailor the nanomorphology in polymer/fullerene blends, we study effect of electrostatic field (E-field) on solidification poly(3-hexylthiophene-2, 5-diyl) (P3HT):[6,6]-phenyl-C61-butyric acid methyl ester (PC60BM) bulk heterojunction (BHJ). In addition to control; wet P3HT:PC60BM thin films were exposed E-field Van de Graaff (VDG) generator at three different directions—horizontal (H), tilted (T), and vertical (V)—relative plane substrate. Surface characterizations field-treated BHJs...
ABSTRACT In an effort to design efficient low‐cost polymers for use in organic photovoltaic cells the easily prepared donor–acceptor–donor triad of a either cis‐ benzobisoxazole, trans ‐benzobisoxazole or ‐benzobisthiazole flanked by two thiophene rings was combined with electron‐rich 4,8‐bis(5‐(2‐ethylhexyl)‐thien‐2‐yl)‐benzo[1,2‐ b :4,5‐ ′]dithiophene. The electrochemical, optical, morphological, charge transport, and properties resulting terpolymers were investigated. Although differed...
In organic electronic devices, indium tin oxide (ITO) and poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) are the most common transparent electrode anodic buffer layer materials, respectively. A widespread concern is that PEDOT:PSS acidic etches ITO. We show this issue not serious: only a few nanometers of ITO etched in typical device processing conditions storage thereafter; conductivity losses affordable; optical transmission gains further offset these losses. Organic...
In the global search for clean, renewable energy sources, organic photovoltaics (OPVs) have recently been given much attention. Popular modern-day solar cells are made from solution-processable, carbon-based polymers (e.g. model poly(3-hexylthiophene) that intimately blended with fullerene derivatives [6,6]-phenyl-C71-butyric acid methyl ester) to form what is known as dispersed bulk-heterojunction (BHJ). This BHJ architecture has produced some of most efficient OPVs date, reports closing in...
We study the influence of ternary and quaternary alloying elements (Pb, Cd, Cu or Cu–Pb Cu–Cd) on structural, electrical, hardness other mechanical properties Sn–Sb alloys (using an X-ray diffractometer optical microscope, double bridge method, Vickers tester dynamic resonance method) to produce best alloy for bearing applications. Adding Pb improves their properties, such as (elastic modulus, internal friction, fracture strain) thermal conductivity. Also, adding Cu, makes them excellent in...
ABSTRACT Three conjugated polymers comprised of dioctyl‐dithieno‐[2,3‐ b :2',3'‐ d ]silole and a donor‐acceptor‐donor triad either cis‐ benzbisoxazole, trans ‐benzobisoxazole or ‐benzobisthiazole were synthesized via the Stille cross‐coupling reaction. The impact varying heteroatoms and/or location within benzobisazole moiety on optical electronic properties resulting was evaluated cyclic voltammetry UV‐Visible spectroscopy. All have similar band‐gaps ∼1.9 eV highest occupied molecular...
The photostability of bulk heterojunction organic photovoltaic films containing a polymer donor and fullerene-derivative acceptor was examined using resonance Raman spectroscopy controlled laser power densities. donors were poly(3-hexylthiophene-2,5-diyl) (P3HT), poly[[9-(1-octylnonyl)-9H-carbazole-2,7-diyl]-2,5-thiophenediyl-2,1,3-benzothiadiazole-4,7-diyl-2,5-thiophenediyl] (PCDTBT), or...
Fourier transform (FT)-plasmon waveguide resonance (PWR) spectroscopy measures light reflectivity at a interface as the incident frequency and angle are scanned. Under conditions of total internal reflection, reflected intensity is attenuated when satisfy for exciting surface plasmon modes in metal well guided within waveguide. Expanding upon concept two-frequency developed by Peterlinz Georgiadis [Opt. Commun. 1996, 130, 260], apparent index refraction thickness can be measured precisely...
P3HT (poly (3-hexylthiophene)) has been widely used as a donor in the active layer organic photovoltaic devices. Although moderately high-power conversion efficiencies have achieved with P3HT-based devices, structural details, such orientation of polymer units and extent H- J-aggregation are not yet fully understood; different measures taken to control ordering material. One measure, which exploited, is apply an electric field from Van de Graaff generator. Fluorescence (to measure anisotropy...