Synthesis and photovoltaic properties of two side‐chain polymeric metal complexes containing 8‐hydroxyquinoline and fluorene units with Zn(II) and Cd(II)

Abstract

Two novel side-chain polymeric metal complexes (PF1 and PF2) containing 8-hydroxyquinoline and fluorene units with Zn(II) andCd(II) having donor-acceptor π-conjugated structure have been synthesized and characterized using Fourier transform infrared, 1 H NMR, UV-visible and photoluminescence spectroscopies, thermogravimetric analysis, differential scanning calorimetry, elemental analysis and cyclic voltammetry. Dye-sensitized solar cells (DSSCs) based on PF1 and PF2 as the dye sensitizers exhibit good device performance with solar-to-electricity conversion efficiency up to 0.32% (J sc = 0.83 mA cm −2 , V oc = 0.62 mV and FF = 0.62) and 0.24% (J sc = 0.69 mA cm −2 , V oc = 0.59 mV and FF = 0.60), respectively, under simulated AM 1.5 G solar irradiation (100 mW cm −2 ). The data show that these novel polymeric metal complexes are suitable for DSSCs.

Structure and photoluminescent properties of 2-methyl-6,7-difluoro-8-hydroxyquinoline

“…The photoinduced ESIPT is normally observed in organic compounds having both a protic acidic group and a basic center with an intramolecular hydrogen bond [3]. 8-Hydroxyquinoline containing the phenol hydroxyl and the pyridine nitrogen atom, as well as its numerous derivatives and metal chelates attracted attention of researchers since the first data on the aluminum complex of 8-hydroxyquinoline (AlQ 3 ) demonstrating intense green fluorescence, thermal stability, and good electronic mobility have been published [4][5][6][7][8][9][10]. Recently, computational methods were applied to investigate aromatic properties of 8hydroxyquinoline in its different forms (anionic, neutral, zwitter-ionic, and cationic), as well as of chelates with magnesium and aluminum [11].…”