We present a fully inkjet-printed flexible thermoelectric device using organic and organic/inorganic hybrid materials. As part of our effort in the development of an n-type material, we present an approach to synthesize a solution processable thermoelectric hybrid material based on in situ oxidative polymerization and intercalation that can yield layered quasi two-dimensional superlattice structures. Thus, we have inserted poly(3,4-ethylenedioxythiophene) (PEDOT) within the nanotemplates of vanadium pentoxide gel (V₂O₅·nH₂O) in order to enhance the charge carrier concentration. Furthermore, for the first time, we adapted the hybrid (PEDOT)_xV₂O₅ material to the inkjet printing technology, thus successfully proving the printability of (PEDOT)_xV₂O₅. Hence, we successfully produced a thermoelectric device composed of 4 thermocouples. Moreover, we optimized the geometry of the organic thermoelectric generator (OTEG) device thanks to a numerical model; the simulated and measured results are presented. The OTEG yielded a power density as high as 0.266 μW cm⁻² for a temperature gradient of 20 K, therefore unveiling the potential of hybrid V₂O₅-based compounds for thermoelectric applications.

中文翻译：

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基于稳定n型纳米复合材料的有机热电设备，印在纸上†

我们介绍了一种使用有机和有机/无机混合材料的完全喷墨印刷的柔性热电设备。作为开发n型材料的努力的一部分，我们提出了一种基于原位氧化聚合和插层法合成可溶液加工的热电混合材料的方法，该方法可产生层状准二维超晶格结构。因此，我们在五氧化二钒凝胶（V ₂ O ₅ · n H ₂ O）的纳米模板中插入了聚（3,4-乙撑二氧噻吩）（PEDOT ），以提高电荷载流子浓度。此外，我们首次采用了混合动力（PEDOT）_x V ₂ O ₅材料应用于喷墨打印技术，从而成功地证明了（PEDOT）_x V ₂ O _5的可打印性。因此，我们成功生产了由4个热电偶组成的热电设备。此外，借助数值模型，我们优化了有机热电发生器（OTEG）装置的几何形状；给出了仿真和测量结果。OTEG在20 K的温度梯度下产生的功率密度高达0.266μWcm ^-2，因此揭示了基于杂化V ₂ O ₅的化合物在热电应用中的潜力。