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Showing 1 to 20 of 26 for “"benzothiadiazole"”.
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A Contribution to the Chemistry of 1,2,3-BENZOTHIADIAZOLE
… The reasons for believing that 1,2,3-benzothiadiazole is a cyclic ring compound are reviewed. Its pKa and ultraviolet spectrum are discussed. Evidence that the -NsN- group in 1,2,3-benzothiadiazole resembles a nitro-group is quoted and this fact together with the suggestion that there …
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A New 2,1,3-Benzothiadiazole-Fused N-Heterocyclic Carbene and Its Metal Complexes
<p>In the last few decades, N-heterocyclic carbenes (NHCs) have emerged as a powerful class of carbon-based ligands. Owing to their unique electronic and steric properties, they have been incorporated in a large variety of catalytically active metal complexes. One of the strategies that have been …
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Chemical reversion of sex expression in dioecious cucumber (Cucumis sativus L.) with ethephon and a benzothiadiazole
Thesis (M.S.)--Michigan State University. Dept. of Horticulture, 1972
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Enhancing Fluorescence and Charge Transport in Disordered Organic Semiconductors
… the indacenodithiophene-$\textit{alt}$-benzothiadiazole family, which demonstrate high $\mu$ in spite of a low long-range structural order, to understand the interplay between these two important device figures-of-merit. In the first section, we evaluate the effect of various tuneable …
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Fluorescence Enhancement Strategies for Polymer Semiconductors
… mobility polymer poly(indacenodithiophene-co-benzothiadiazole), the addition of a phenyl- initiated side chain can enhance the solid-state fluorescence quantum yield, exciton lifetime and exciton diffusion length significantly in comparison to that without phenyl-addition. 2. Energy transfer …
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Structure-property relationships of dyes as applied to dye-sensitized solar cells
… reflectometry that impact of their function. A benzothiadiazole-based dye, RK-1, is then systematically studied by both experimental and computational methods, and the results show that the π-bridge composed of thiophene, benzothiadiazole and benzene rings leads to excellent charge separation; …
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Simulation of polymer solar cell characteristics by amps-1d
… acid methylester (P3HT: PCBM) and poly[2,1,3-benzothiadiazole-4,7-diyl[4,4- bis(2-ethylhexyl)-4H-cyclopenta[2,1-b:3,4-b']dithiophene-2,6-diyl]]: [6, 6]-phenyl C_{61}- butyric acid methylester (PCPDTBT: PCBM) are used as active layer materials. Analysis of Microelectronic and Photonic …
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SPECTROSCOPIC, IMAGING, AND DOPING STUDIES OF PUSH-PULL CONJUGATED POLYMER SOLAR CELLS
… [2,1- b;3,4-b\u2032]dithiophene)-alt-4,7(2,1,3-benzothiadiazole)] (PCPDTBT) is a promising candidate for use in solar cell active layers, and has produced OPV devices with power conversion efficiencies (PCEs) exceeding 5% when blended with fullerene electron acceptors. Although these results are …
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Determining The Excited State Properties of Novel Aryleneethynylenes
… viously in the literature. The benzofurazan and benzothiadiazole–based oligomers have been appended with peripheral substituents in the form of electron–donating and electron–withdrawing groups (R = H, t–Bu, OMe, NH2, CO2Me and CN), in an attempt to monitor the effect of increasing electron …
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Molecular design of conjugated polymers for the control of conformation, electronics and self-assembly
… new electron deficient monomers based on 2,1,3-benzothiadiazole and 2,1,3-benzooxazole bearing solubilizing side-chains (Chapter 5).
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Quarternisation of Benzothiazoles and 1,2,3 - Benzothiadiazoles
… improved. The quaternisation of 1,2,3-benzothiadiazole with higher alkyl, substituted alkyl, and polymethylene bis 2,4-dinitrobenzeoGsulphonat«s has been studied. A brief review of the quaternisation of benzothiaziole and some of its derivatives is given. Experiments on the …
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An investigation of liquid crystalline and semiconducting blends for applications in photovoltaics
… certain molecular groups. Compounds with a benzothiadiazole-thiophene structure were found to be potentially low band gap electron donor materials with perylene based compounds as electron acceptors. Fluorene-thiophene based compounds were also identified as potential electron donors. Charge …
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Synthesis and Characterization of CdSe/ZnS Core/Shell Quantum Dot Sensitized PCPDTBT-P3HT:PCBM Organic Photovoltaics
… [2,1-b;3,4-b′]dithiophene)-alt-4,7(2,1,3-benzothiadiazole)] (PCPDTBT), we have fabricated devices with a wide spectral response and 3% power conversion efficiency in AM 1.5 conditions; however, this thin film system exhibits only 0.43 optical density at 500 nm. To improve the performance …
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Light-emitting diodes from polyfluorenes: characterisation and stability of performance
… (TFB) and poly(9,9’-dioctylfluorene-co-benzothiadiazole) (F8BT), using pulsed electroluminescence. A strongly morphology-dependent spike-transient is observed in the electroluminescence at turn-on, and this is investigated by numerical modelling. Although not all features of the system …
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Characterization of Chitinase Activity and Gene Expression in Muskmelon Seeds
… tissue-specific manner. Salicylic acid (SA) and benzothiadiazole (BTH) stimulated the expression of Cmchi1 but not Cmchi2 in seeds after radicle emergence, indicating that SA might be involved in inducing the expression of Cmchi1, while a different signal might be involved in triggering the …
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Synthesis and properties of some 4H-1, 3, 4 benzothiadiazines /|nby Darko J. Vukov. -- 260 St. Catharines, Ont. : [s. n.],
The work herein has been divided into five sections. In the first section, a new method of converting N-aroyl- hydrazines to hydrazidic halides is described. The second section deals with the products of reaction of hydrazidic halides with thioacetate ion in acetonitrile at room temperature. A …
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Describing Charge Transfer in Extended Donor-Acceptor Systems with Density Functional Theory
… that are composed of thiophene as donor and benzothiadiazole or naphthalene diimide as acceptor. We show how the optical and electronic properties can be tailored by changing the conjugation length and the arrangement of the donor and acceptor components. We also address the downsides that …
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Optoelectronic processes in polyfluorene ambipolar transistors
… co-polymer, poly(9,9-di-n-octylfluorene-alt-benzothiadiazole) (F8BT) is expected to have an electron wavefunction that is more localized that the hole. The ambipolar transistors used in this thesis are typified by a dominant contact resistance which introduces difficulties in the charge …
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Improving the Stability of Organic Field-Effect Transistors
… conjugated polymer indacenodithiophene-co-benzothiadiazole (IDT-BT) as our model system due to its low energetic disorder and high reported mobilities exceeding 1 cm<sup>2</sup>V<sup>−1</sup>s<sup>−1</sup>. Since stability studies require an exceptional level of reproducibility, we …
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Electroluminescence in ion gel gated organic polymer semiconductor transistors
… light emission in poly(9,9'-dioctylfluorene-co-benzothiadiazole) (F8BT) polymer semiconductor, with 1-ethyl-3-methylimidazoliumbis (trifluoromethylsulfonyl) imide/ poly(styrene-block-ethylene oxide-block-styrene (EMIM TFSI/ SOS) ion gel as dielectric material is reported. The current-voltage …
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