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Highlights: [•] Four novel D-A dye sensitizers of polymeric metal complexes were synthesized and investigated in Dye-sensitized solar cells. [•] Compared with polymer P1 and P2, P3 and P4 show a lower LUMO due to the change of molecular composition unit. [•] The light harvesting efficiency and photogenerated current of cadmium polymer complexes is better than zinc polymer complexes. [•] The four polymeric metal complexes show excellent thermal stability. [ABSTRACT FROM AUTHOR]

Four polymeric metal complexes ( P1- P4) based on 1,10-phenanthroline metal complexes and alkylfluorene or alkoxybenzene were synthesized by the Heck coupling reaction and were developed for dye-sensitized solar cell applications. The target dyes use alkoxybenzene or alkylfluorene as the electron donor, a C=C moiety as the π linker, and the phenanthroline derivative complex was used as the electron acceptor. Bipyridine derivatives were ancillary ligands as well as providing anchoring groups. The thermal, photophysical, electrochemical and photovoltaic properties of these copolymers were investigated by thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), C-V curves and I-V curves. Dye-sensitized solar cells with these polymeric metal complexes as dye sensitizers exhibited considerable power conversion efficiencies (PCE). The dyes containing alkoxybenzenes ( P3, P4) exhibited higher PCE values than the corresponding target polymers containing alkylfluorenes ( P1, P2), The dye P3 showed the maximal power conversion efficiency of 2.12 % ( Jsc = 4.91 mA/cm2, Voc = 0.69 V, FF = 62.5). In addition, the four polymers possessed excellent stabilities, and their thermal decomposition temperatures all exceeded 300 °C, indicating that these polymeric metal complexes are suitable for the fabrication processes of optoelectronic devices. [ABSTRACT FROM AUTHOR]

Four main chain polymeric metal complexes ( P1-P4) based on 8-hydroxyquinoline metal complexes have been synthesized by the Heck coupling and characterized by gel-permeation chromatography, Fourier transform infrared spectroscopy, proton-nuclear magnetic resonance, thermogravimetric analysis, ultraviolet-visible absorption, photoluminescence spectroscopy, elemental analysis, and cyclic voltammetry. The applications of these polymers as dye sensitizers in dye-sensitized solar cells (DSSCs) are also studied. The study results show that the solar cells have good device performance with power conversion efficiency of P1-P4 up to 2.17, 2.04, 2.45, and 2.18%, respectively. The highest power conversion efficiency of DSSCs is up to 2.45%, for P3 consisting of alkoxy benzene unit and Cd-metal complex under the illumination of air mass 1.5 G, 100 mW cm−2. POLYM. COMPOS., 34:1629-1639, 2013. © 2013 Society of Plastics Engineers [ABSTRACT FROM AUTHOR]

Four novel donor-π-bridge-acceptor(D-π-A) main chain polymeric metal complexes (P1, P2, P3 and P4) as dye sensitizers for dye-sensitized solar cells (DSSCs) based on Zn(II) or Cd(II) complexes with fluorene and 8-hydroxyquinoline ligand have been synthesized by the Heck coupling and characterized by FT-IR, Elemental analysis and GPC. The optical properties, thermal properties, electrochemical properties and photovoltaic properties of these polymeric metal complexes have been investigated and studied by TGA, DSC, C-V curves and I-V curves. DSSCs based on P1 and P3 show good photovoltaic performances and the corresponding power conversion efficiency (PCE) are up to 1.99 % (J = 4.59 mA cm, V = 0.68 V, FF = 0.636) and 2.05 % (J = 5.25 mA cm, V = 0.60 eV, FF = 0.65) under simulated AM 1.5 G solar irradiation (100 mW cm). Besides, they showed good stabilities with thermal decomposition Temperatures are 421, 441, 413, 385 °C, respectively, which are suitable for DSSCs. Graphical Abstract: [Figure not available: see fulltext.] [ABSTRACT FROM AUTHOR]

Four novel donor − π-bridge − acceptor (D − π − A) polymeric metal complexes (P1-P4) based on 8-hydroxyquinoline metal complexes were synthesized and tested for their performance in dye-sensitized (DSSCs). The polymeric metal complexes dyes use alkoxy benzene or alkyl fluorene as the electron donor and C=C as π linker; the 8-hydroxyquinoline derivative complex part was used as the electron acceptor and diaminomaleonitrile was used as ancillary ligand. The two strongly electron-withdrawing cyano groups in the polymer structure can provide an efficient in the between donor and acceptor parts. The thermal, photophysical, electrochemical and photovoltaic properties of these copolymers were investigated by TGA, differential scanning calorimetry, cyclic voltammetry and cureent density-voltage curves, and the results showed that dye containing complex Zn(II) and alkoxy benzene unit benefited the generation of photocurrent and open-circuit voltages, and a maximum power conversion efficiency of 1.91% (P2) was obtained, with an open-circuit voltage of 0.71 V, a short-circuit current density of 4.23 mA cm−2, and a fill factor of 38.6% under AM1.5G irradiation. The study results also show that the four polymers exhibit good , indicating that these polymeric metal complexes are suitable for the fabrication processes of optoelectronic devices. Copyright © 2013 John Wiley & Sons, Ltd. [ABSTRACT FROM AUTHOR]

Abstract: Four new donor-π-acceptor (D-π-A) dyes (P1, P2, P3, P4) were synthesized, characterized and applied in dye-sensitized solar cells (DSSCs). Poly(p-phenylenevinylene) (PPV) or Bisthien PPV was used as donor, ethilenic link or thiophene as π-bridge, and Cadmium complexes or Nickel complexes as acceptor in these D-π-A type sensitizers. The introduction of the polymerization of π system and the metal complexes has greatly increased the light absorption. Increasing the number of thienyl group in the molecule to a certain extent was effective in further lowering both the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) energy levels to attain higher open-circuit voltage (V oc). Among them, P3-based cell shows excellent photovoltaic performance and power conversion efficiency up to 2.25% under AM 1.5G irradiation (100 mW cm−2). [Copyright &y& Elsevier]