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Sorting-free utilization of semiconducting carbon nanotubes for large thermoelectric responses

机译：用于大型热电反应的半导体碳纳米管的无分选

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摘要

Semiconducting carbon nanotubes (s-CNTs) are promising organic thermoelectric materials mainly due to their large thermopower (or Seebeck coefficient), but it is impractical to pick only s-CNTs out of a mixture of different chirality tubes in mass-produced CNTs. Here we report a sorting-free method for getting the large thermopower by suppressing electronic transport from metallic CNT (m-CNT). This study employed an organic electrochemical transistor (OECT) configuration where poly (3,4-ethylenedioxythiophene): poly (styrenesulfonate) (PEDOT:PSS) channel was disposed between two separated CNT films. Based on the experimentally constructed band diagrams and theoretical estimation, the PEDOT:PSS channel could create energy barriers for abating the contribution of m-CNT to thermopower as well as injecting holes to CNT films. As the gate bias voltage was raised up to 20 V, thermopower was noticeably increased, resulting in the maximum power factor. For practical applications without an externally supplied bias voltage, nanoscale PEDOT:PSS were deposited on top of one end of CNT films for the out-of-plane hole transport, and then PEDOT:PSS was chemically de-doped to adjust the Fermi level like the OECT experiment. With six CNT-PEDOT connections, the thermopower was raised up to similar to 150 mu V/K and a remarkably high PF was obtained up to similar to 1.3 x 10(3) mu W/m-K-2 at room temperature, which is similar to 460% improvement compared with that of pristine CNT and is comparable to those of inorganic counterparts. This study provides not only better understanding of thermoelectric behaviors for organic thermoelectric materials, but also a practical method for suppressing the electronic transport from m-CNT, which would be widely applicable to other organic materials for thermoelectrics and beyond.
机译：半导体碳纳米管（S-CNT）是有机有机热电材料，主要是由于其大的蒸发器（或塞贝克系数），但在大规模生产的CNT中仅挑选不同人行为管的混合物中仅挑选S-CNT是不切实际的。在这里，我们通过抑制来自金属CNT（M-CNT）的电子传输来报告一种用于获得大型热电器的无序方法。该研究采用了有机电化学晶体管（OECT）构型，其中聚（3,4-亚乙二氧基噻吩）：聚（苯乙烯磺酸盐）（PEDOT：PSS）通道设置在两个分离的CNT膜之间。基于实验构造的带图和理论估计，PEDOT：PSS通道可以产生用于使M-CNT的贡献的能量屏障产生热量，并将孔注入CNT薄膜。随着栅极偏置电压升高到20V，显着增加，热量升高，导致最大功率因数。对于没有外部供应偏置电压的实际应用，纳米级PEDOT：PSS沉积在CNT薄膜的一端的顶部，用于外平面孔输送，然后PEDOT：PSS化学脱掺量以调节FERMI水平OET实验。具有六个CNT-PEDOT连接，热调节器升高至类似于150μmV/ k，并且在室温下获得显着高的PF至类似于1.3×10（3）μW/ mk-2，这类似于类似的与原始CNT相比的460％改善，与无机对应物相当。本研究不仅提供了对有机热电材料的热电行为的更好理解，而且还提供了抑制M-CNT电子传输的实用方法，这将广泛应用于用于热电和超越的其他有机材料。

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