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The Investigation of the Seebeck Effect of the Poly(3,4-Ethylenedioxythiophene)-Tosylate with the Various Concentrations of an Oxidant
摘要： Poly(3,4-ethylenedioxythiophene)-tosylate (PEDOT-Tos) can be synthesized through an in situ polymerization and doping process with iron(III) p-toluenesulfonate hexahydrate as an oxidant. Both the Seebeck coefficient and the electrical conductivity were modified by varying the concentration of the oxidant. We investigated the effects of varying the concentration of the oxidant on the particle sizes and doping (oxidation) levels of PEDOT-Tos for thermoelectric applications. We demonstrated that an increase in the oxidant enabled an expansion of the particle sizes and the doping levels of the PEDOT-Tos. The modification of the doping levels by the concentration of the oxidant can provide another approach for having an optimal power factor for thermoelectric applications. De-doping of PEDOTs by reduction agents has been generally investigated for changing its oxidation levels. In this study, we investigated the effect of the concentration of the oxidant of PEDOT-Tos on the oxidation levels, the electrical conductivities and the Seebeck coefficients. As loading the oxidant of PEDOT-Tos, the Seebeck coefficient was compromised, while the electrical conductivity increased.
关键词： conjugated polymer,doping concentration,seebeck effect
更新于2025-09-23 15:22:29
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Controlled doping of graphene by impurity charge compensation via a polarized ferroelectric polymer
摘要： A simple technique of doping graphene by manipulating adsorbed impurity charges is presented. Using a field effect transistor configuration, controlled polarization of a ferroelectric polymer gate is used to compensate and neutralize charges of one type. The uncompensated charges of the opposite type then dope graphene. Both n- and p-type doping are possible by this method, which is non-destructive and reversible. We observe a change in n-type dopant concentration of 8 × 1012 cm?2 and a change in electron mobility of 650%. The electron and hole mobilities are inversely proportional to the impurity concentration, as predicted by theory. Selective doping of graphene can be achieved using this method by patterning gate electrodes at strategic locations and programming them independently. Such charge control without introducing hard junctions, therefore, permits seamless integration of multiple devices on a continuous graphene film.
关键词： ferroelectric polymer,doping,graphene,charge compensation,field effect transistor
更新于2025-09-23 15:21:01
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Control of aggregation and dissolution of small molecules hole transport layer through a doping strategy of highly efficient perovskite solar cell
摘要： Recently, small molecule hole transporting materials (HTLs) have attracted growing interest in perovskite solar cells due to their low-cost, excellent stability and better energy level alignment with perovskite. Nonetheless, an amorphous and coarse surface film is one of the main obstructions to the performance of these small molecule HTLs. Herein, N,N′-Di(1-naphthyl)-N,N′-diphenyl-(1,1′-biphenyl)-4,4′-diamine (NPB) small molecule was doped with a polymer to overcome the formation of molecular aggregation in HTL. This polymer doping strategy resulted into a very smooth surface, which improved photo-physical and electrochemical properties at HTL/perovskite interface. Consequently, a maximum power conversion efficiency (PCE) of 17.80%, 32% higher than the control, i.e. NPB-based device (13.57%), has been achieved. This work reveals critical behaviour of molecular aggregations on the performance of perovskite solar cells, which impairs the development of an efficient device based on small molecule HTLs.
关键词： PTAA,aggregation,dissolution,NPB,polymer doping,small molecule
更新于2025-09-11 14:15:04