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P-doped semiconducting polymers : process optimization, characterization and investigation of air stability

Abstract : Organic semiconductors (OSCs) are promising materials for low-cost, flexible, large-area production of printed electronic devices. In this context, molecular doping allows controlling the electrical properties of OSCs, offering a powerful tool to improve the performances of different electronic devices. Despite the progress in the fundamental understanding of the doping mechanism and processing techniques, stability aspects of p-doped OSCs have received little attention. Nevertheless, the stability of the p-doped state in the presence of oxygen and humidity is a crucial factor to be investigated for the integration of doped layers in organic devices.In this thesis, we have studied the molecular doping of disordered polymer semiconductors and the stability of the p-doped state in the presence of oxygen and water-related species. PBDTTT-c and RRa-P3HT were used as polymer hosts and F4TCNQ and Mo(tfd-COCF3)3 as p-dopants. The process conditions have been carefully studied to achieve controlled doping and to optimize the electrical properties. The impact of the dopant concentration was investigated in terms of electrical (conductivity), optical (UV-Vis-NIR) and structural (GIWAXS) properties of doped layers.The stability of the p-doped state was investigated by monitoring the evolution of the doping signatures under three different atmospheres: argon, anhydrous air, and ambient air. XPS analyses were carried out to investigate the impact of air exposure on the chemical state of p-doped layers. Simulations have been used to support our findings.Present results highlighted the presence of an important dedoping mechanism for p-doped semiconducting polymers in the presence of water-related species.
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Tamara Nunes Domschke. P-doped semiconducting polymers : process optimization, characterization and investigation of air stability. Electronics. Université de Lyon, 2020. English. ⟨NNT : 2020LYSES020⟩. ⟨tel-03207268⟩

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