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Synthesis and characterization of poly(2,5-diyl pyrrole-2-pyrrolyl methine)semiconductor copolymer

Journal of Semiconductors 2018年第10期39卷 10-16页

作者： Hammou Gherras Ahmed Yahiaoui Aicha Hachemaoui abdelkader belfedal abdelkader Dehbi Abdel-Hamid I.Mourad Laboratoire de chimie Organique Macromoleculaire et des Materiaux(LCOMM)Universite de MascaraFaculte des Sciences ExactesBP 763 Mascara 29000Algeria Laboratoire de Chimie Physique des Macromolecules et Interfaces Biologiques Universite de Mascara Algeria Laboratoire de Genie Physique Universite d'Ibn KhaldounTiaret BP 78 14000 TiaretAlgeria Mechanical Engineering Department College of EngineeringUnited Arab Emirates UniversityAl-AinUAE On leave from Mechanical Design Department Faculty of EngineeringHelwan UniversityCairoEgypt

The proposed technique to synthesise poly {（2,5-diyl pyrrole）（2-pyrrolyl methine）}（PPPM） copolymer by condensation of pyrrole and pyrrole-2-carboxaldehyde monomers catalyzed by Maghnite-H＋ is introduced.The protons are exchanged with Maghnite-H＋, which is available in the form of a montmorillonite silicate clay sheet. The effect of several parameters such as time and temperature of copolymerization, [pyrrole]/[pyrrole-2-carboxaldehyde] molar ratio, amount of Maghnite-H＋, and solvent on the produced poly（2,5-diyl pyrrole-2-pyrrolyl methine） semiconductor copolymer material（yield%） was investigated. The synthesized PPPM copolymer was characterized using nuclear magnetic resonance, Fourier transform infrared, and ultraviolet-visible spectroscopy.The results show that the synthesized copolymer using the copolymerization technique is a real organic copolymer consisting of two monomers units（i.e, pyrrole and pyrrole-2-carboxaldehyde）. Also, the synthesized copolymer is more soluble than polypyrrole in most of the commonly used organic solvents. Hence, copolymerization of pyrrole with pyrrole-2-carboxaldehyde will overcome the insolubility of polypyrrole. In addition, the resultant copolymer exhibits good film formability. The produced copolymer has several potential applications in the field of rechargeable batteries, sensors, capacitors, light emitting diodes, optical displays, and solar cells.

关键词： proposed technique Maghnite-H^＋ catalyst conducting PPPM copolymer pyrrole pyrrole-2-carboxaldehyde

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Density of States in Intrinsic and n/p-Doped Hydrogenated Amorphous and Microcrystalline Silicon

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Journal of Modern Physics 2011年第9期2卷 1030-1036页

作者： Larbi F. Belfedal Abdelkader Sib J. D. Bouizem Y. Chahed L. Amaral A. 不详

Gap states in amorphous hydrogenated silicon (a-Si:H) doped and microcrystalline silicon doped n and p were examined by analysis of subgap absorption spectra obtained by the Constant Photocurrent Method (CPM) and the Photothermal Deflection Spectroscopy (PDS). Assuming a Gaussian distribution of defect states in the gap, broad distribution of states was found in a-Si:H and doped a-Si:H. A dependence of the defect concentration on Fermi energy was detected and analysed by thermodynamic model of defect formation in a-Si:H.

关键词： Defects Formation Doping Microcrystalline Silicon Thermodynamic Model of Defect Optical Properties and Measurements

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