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<p>Two sulfur-based polymers, P1 and P2, were synthesized and investigated for their potential applications in optoelectronic devices. To create the thin films, the spin-coating technique was used on glass substrates that had been coated with ITO. Impedance spectroscopy, photoluminescence (PL), atomic force microscopy (AFM), and current–voltage (I-V) measurements were used to analyze the electrical, optical, and structural properties. AFM imaging revealed that P1 possesses a rougher surface and more pronounced molecular packing than P2. Optical studies showed that P2 possesses a smaller optical band gap (2.37 eV) than P1 (2.46 eV), while P2 demonstrates stronger π-conjugation, evidenced by a red-shifted absorption band. These findings were further supported by photoluminescence spectra, which indicated differences in excited-state delocalization between the two polymers. Electrical characterization revealed thermally activated charge transport governed by a hopping mechanism. This charge-transport behavior was further confirmed by impedance spectroscopy, modeled using an equivalent circuit of Rs–(Rp || Cp). Overall, polymer P2 exhibits improved charge transport properties and a lower band gap, making it a more promising candidate for optoelectronic applications, despite the higher degree of conjugation observed in P1.</p>

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Developing sulfur-bridged conjugated polymers to enhance charge transport in organic electronic devices

  • 期刊论文

  • 发表日期：

    2026年7月21日

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  • Rym Hassani,
  • Mehdi Akermi,
  • Yahya Alajlani,
  • Nejmeddine Smida Jaballah,
  • Yehya M. Megmmi,
  • Rafik Ben Chaâbane

摘要

Two sulfur-based polymers, P1 and P2, were synthesized and investigated for their potential applications in optoelectronic devices. To create the thin films, the spin-coating technique was used on glass substrates that had been coated with ITO. Impedance spectroscopy, photoluminescence (PL), atomic force microscopy (AFM), and current–voltage (I-V) measurements were used to analyze the electrical, optical, and structural properties. AFM imaging revealed that P1 possesses a rougher surface and more pronounced molecular packing than P2. Optical studies showed that P2 possesses a smaller optical band gap (2.37 eV) than P1 (2.46 eV), while P2 demonstrates stronger π-conjugation, evidenced by a red-shifted absorption band. These findings were further supported by photoluminescence spectra, which indicated differences in excited-state delocalization between the two polymers. Electrical characterization revealed thermally activated charge transport governed by a hopping mechanism. This charge-transport behavior was further confirmed by impedance spectroscopy, modeled using an equivalent circuit of Rs–(Rp || Cp). Overall, polymer P2 exhibits improved charge transport properties and a lower band gap, making it a more promising candidate for optoelectronic applications, despite the higher degree of conjugation observed in P1.