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<p>Organic solar cells (OSCs) are promising candidates for next-generation photovoltaics due to their lightweight, mechanical flexibility, and compatibility with low-cost, large-area fabrication. However, their commercial application remains limited by low charge carrier mobility and high recombination rates. In this study, we investigated the role of tungsten diselenide (WSe<sub>2</sub>) nanoparticles (NPs) in enhancing the charge transport and suppressing recombination in P3HT:PC<sub>61</sub>BM-based polymer solar cells. WSe<sub>2</sub> NPs, synthesized via laser ablation in chlorobenzene, were incorporated into the bulk heterojunction (BHJ) active layer. Structural, optical, and electrical characterizations were performed using Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM), Ultraviolet – visible (UV–Vis), Photoluminescence (PL), Raman, and impedance spectroscopy. At the optimized concentration of 0.35 wt.% WSe<sub>2</sub>, the device exhibited a significant enhancement in performance, with the short-circuit current density (Jsc) increasing from 7.8 to 13.0&#xa0;mA/cm<sup>2</sup> and the power conversion efficiency (PCE) improving from 1.85% to 3.04%. Impedance analysis revealed that recombination resistance increased by a factor of 2.8 at optimal WSe₂ loading, indicating suppressed recombination and enhanced charge extraction. This work demonstrates a simple, scalable approach for improving OSC efficiency using solution-processed Transition metal dichalcogenides (TMD) nanoparticles and provides insights into the concentration-dependent trade-off between charge transport and recombination.</p>

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The role of WSe2 nanoparticles in charge transport and recombination in a polymer solar cell

  • 期刊论文

  • 发表日期：

    2025年7月11日

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  • Zhannur Akhatova,
  • Aitbek Aimukhanov,
  • Baurzhan Ilyassov,
  • Assylbek Zeinidenov,
  • Togzhan Seisembekova,
  • Alexander Alekseev,
  • Dosmukhammed Abeuov

摘要

Organic solar cells (OSCs) are promising candidates for next-generation photovoltaics due to their lightweight, mechanical flexibility, and compatibility with low-cost, large-area fabrication. However, their commercial application remains limited by low charge carrier mobility and high recombination rates. In this study, we investigated the role of tungsten diselenide (WSe2) nanoparticles (NPs) in enhancing the charge transport and suppressing recombination in P3HT:PC61BM-based polymer solar cells. WSe2 NPs, synthesized via laser ablation in chlorobenzene, were incorporated into the bulk heterojunction (BHJ) active layer. Structural, optical, and electrical characterizations were performed using Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM), Ultraviolet – visible (UV–Vis), Photoluminescence (PL), Raman, and impedance spectroscopy. At the optimized concentration of 0.35 wt.% WSe2, the device exhibited a significant enhancement in performance, with the short-circuit current density (Jsc) increasing from 7.8 to 13.0 mA/cm2 and the power conversion efficiency (PCE) improving from 1.85% to 3.04%. Impedance analysis revealed that recombination resistance increased by a factor of 2.8 at optimal WSe₂ loading, indicating suppressed recombination and enhanced charge extraction. This work demonstrates a simple, scalable approach for improving OSC efficiency using solution-processed Transition metal dichalcogenides (TMD) nanoparticles and provides insights into the concentration-dependent trade-off between charge transport and recombination.