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<p>The weak intermolecular forces in π-conjugated polymers lead to poorly defined polymer structures over long distances. For efficient charge transport in organic electronic devices, it is crucial that π-conjugated polymers exhibit long-range ordering in their nanoscale morphology. In this work, MoS₂ nanosheets are used to enhance the long-range ordering in Poly[2,6-(4,4-bis-(2-ethylhexyl)-4&#xa0;H-cyclopenta[2,1-b;3,4-b′]dithiophene)-alt-4,7(2,1,3-benzothiadiazole)] (PCPDTBT) polymer. MoS₂ nanosheets are synthesized via an ultrasonication-assisted liquid-phase exfoliation method, and their formation is confirmed through ultraviolet-visible (UV–Vis) absorption spectroscopy, X-ray diffraction (XRD), Raman spectroscopy, high-resolution transmission electron microscopy (HR-TEM), and energy-dispersive X-ray spectroscopy (EDS) mapping. PCPDTBT and MoS<sub>2</sub> blended (PCPDTBT/MoS<sub>2</sub>) thin films, prepared at varying MoS<sub>2</sub> nanosheet concentrations, serve as the active layer in organic field-effect transistors (OFETs). Structural characterization of the active layers reveals improved crystallinity and enhanced long-range ordering in PCPDTBT/MoS<sub>2</sub> films, reducing barriers for charge carriers moving from source to drain. The PCPDTBT/MoS<sub>2</sub> (sample M1)-based OFET exhibits a threefold increase in charge carrier mobility compared to the pristine PCPDTBT-based OFET.</p>

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Charge transport study in MoS2 blended PCPDTBT based organic field effect transistor

  • 期刊论文

  • 发表日期：

    2025年6月20日

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  • Pankaj Kumar,
  • Sarita Yadav,
  • C. K. Singh,
  • Anchal Kishore Singh,
  • Naresh Kumar,
  • Lokendra Kumar

摘要

The weak intermolecular forces in π-conjugated polymers lead to poorly defined polymer structures over long distances. For efficient charge transport in organic electronic devices, it is crucial that π-conjugated polymers exhibit long-range ordering in their nanoscale morphology. In this work, MoS₂ nanosheets are used to enhance the long-range ordering in Poly[2,6-(4,4-bis-(2-ethylhexyl)-4 H-cyclopenta[2,1-b;3,4-b′]dithiophene)-alt-4,7(2,1,3-benzothiadiazole)] (PCPDTBT) polymer. MoS₂ nanosheets are synthesized via an ultrasonication-assisted liquid-phase exfoliation method, and their formation is confirmed through ultraviolet-visible (UV–Vis) absorption spectroscopy, X-ray diffraction (XRD), Raman spectroscopy, high-resolution transmission electron microscopy (HR-TEM), and energy-dispersive X-ray spectroscopy (EDS) mapping. PCPDTBT and MoS2 blended (PCPDTBT/MoS2) thin films, prepared at varying MoS2 nanosheet concentrations, serve as the active layer in organic field-effect transistors (OFETs). Structural characterization of the active layers reveals improved crystallinity and enhanced long-range ordering in PCPDTBT/MoS2 films, reducing barriers for charge carriers moving from source to drain. The PCPDTBT/MoS2 (sample M1)-based OFET exhibits a threefold increase in charge carrier mobility compared to the pristine PCPDTBT-based OFET.