Abstract
In this paper, four novel D–π–A polymeric metal Cd(II) or Zn(II) complexes with 8-hydroxyquinoline metal complex as electron acceptor (A), thiophene as π linker (π), and benzodithiophene or hydroquinone derivatives as electron donors (D) were designed and synthesized for utilization in dye-sensitized solar cells to obtain the efficiency value of up to 2.46 %. The thermal, photophysical, electrochemical, and photovoltaic properties of these copolymers were investigated. The results showed that dyes containing benzodithiophene derivatives as donor reached higher power conversion efficiencies (2.34, 2.46 %) than those with hydroquinone derivatives as donor (1.51, 1.65 %) under standard illumination. Among the four polymers, a solar cell exhibited best photovoltaic performance with a J sc of 5.17 mA cm−2, a V oc of 0.73 V. In addition, the four polymers possessed excellent thermal stabilities, indicating that these polymeric metal complexes are suitable for the fabrication processes of optoelectronic devices.
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