Synthesis and preliminary photovoltaic behavior study of a soluble polyimide containing ruthenium complexes

Abstract

Aiming to prepare photovoltaic materials with light and thermal stability, ruthenium complexes with broad absorption in the visible region were introduced to a polyimide, bpy-PI, which contains a bipyridine ligand in each repeating unit. The chemical structures of the monomers and polymers were confirmed by 1 H NMR, IR, and elemental analysis. The prepared polyimide containing ruthenium complexes (bpy-PI-Ru) showed good solubility in common organic solvents such as DMF, NMP, DMSO and DMAc. UV-vis measurements revealed that bpy-PI-Ru exhibits very broad absorptions in the range 350-750 nm due to the introduction of ruthenium complexes. Such absorption enhancement would enable the polymer to harvest solar light in the visible region. The onset oxidation potential of bpy-PI-Ru was measured as 0.68 V (vs. SCE), which is about 0.06 V lower than that of bpy-PI. The band gap of bpy-PI-Ru is 1.35 eV as measured by cyclic voltammetry. Solar cell devices were fabricated based on bpy-PI-Ru or the blend of bpy-PI-Ru and PCBM. Current density-voltage (J-V) measurement of the devices showed a typical rectifying behavior under a 55 mW cm À2 compact white arc lamp. The open-circuit voltages and short-circuit densities were measured to be in the ranges 0.19-0.52 V and 0.0015-0.38 mA cm À2 , respectively. The short-circuit density could be further improved by anode modification through deposition of PEDOT:PSS on ITO surface.

Classification, processing and application of hydrogels: A review

“…By changing the ratio of hydrophobic to hydrophilic content of the structure of hydrogels, the LCST will be changed. Such hydrogels have two parts; the first is the hydrophilic part -CONH-, and the second is hydrophobic part -R- [53]. At temperatures lower than the LCST, water or fluid interact with the hydrophilic part by forming hydrogen bonds.…”

Synthesis and properties of hyperbranched polyimides derived from novel triamine with prolonged chain segments

“…However, many polyimides are insoluble in common organic solvents and have extremely high glass transition or melting temperatures due to their rigid backbones which limited their applications. To overcome such a difficulty, the current research in this field is focusing on the development of novel polyimides which not only maintain the outstanding comprehensive properties but also exhibit good solubility …”

Physical, optical and gas transport properties of new processable polyimides and poly(amideimide)s obtained from 4,4′-[oxybis(4,1-phenylenethio)]dianiline and aromatic dianhydrides

“…The growth of modern technology has posed a constantly increasing need for materials that can perform well under harsh conditions, such as elevated temperatures, 4 and processable PIs with special properties have become a subject of great interest all over the world. 5,6 It was found that compounds containing imine rings have prospective applications in organic (opto)electronics and related fields, and that they are exemplary as materials for fabricating field-effect transistors, [6][7][8] organic light-emitting diodes, 9-12 solar cells [12][13][14] and photonic devices. [15][16][17] With regard to the PI microstructure, much effort is being devoted to the design and synthesis of PIs with thioether linkages.…”