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首页> 外文期刊>Advanced energy materials >Bringing Conducting Polymers to High Order: Toward Conductivities beyond 10~5 S cm~(−1) and Thermoelectric Power Factors of 2 Mw m~(−1) K~(−2)
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Bringing Conducting Polymers to High Order: Toward Conductivities beyond 10~5 S cm~(−1) and Thermoelectric Power Factors of 2 Mw m~(−1) K~(−2)

机译：将导电聚合物带入高阶：电导率超过10〜5 S cm〜（-1）且热电功率因数达到2 Mw m〜（-1）K〜（-2）

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Here, an effective design strategy of polymer thermoelectric materials based on structural control in doped polymer semiconductors is presented. The strategy is illustrated for two archetypical polythiophenes, e.g., poly(2,5-bis(3-dodecyl-2-thienyl)thieno[3,2-b]thiophene) (C-12-PBTTT) and regioregular poly(3-hexylthiophene) (P3HT). FeCl3 doping of aligned films results in charge conductivities up to 2 x 10(5) S cm(-1) and metallic-like thermopowers similar to iodine-doped polyacetylene. The films are almost optically transparent and show strongly polarized near-infrared polaronic bands (dichroic ratio 10). The comparative study of structure-property correlations in P3HT and C-12-PBTTT identifies three conditions to obtain conductivities beyond 10(5) S cm(-1): i) achieve high in-plane orientation of conjugated polymers with high persistence length; ii) ensure uniform chain oxidation of the polymer backbones by regular intercalation of dopant molecules in the polymer structure without disrupting alignment of pi-stacked layers; and iii) maintain a percolating nanomorphology along the chain direction. The highly anisotropic conducting polymer films are ideal model systems to investigate the correlations between thermopower S and charge conductivity sigma. A scaling law S proportional to sigma(-1/4) prevails along the chain direction, but a different S proportional to -ln(sigma) relation is observed perpendicular to the chains, suggesting different charge transport mechanisms. The simultaneous increase of charge conductivity and thermopower along the chain direction results in a substantial improvement of thermoelectric power factors up to 2 mW m(-1) K-2 in C-12-PBTTT.
机译：在此，提出了一种基于结构控制的聚合物聚合物在聚合物热电材料中的有效设计策略。说明了两种原型聚噻吩的策略，例如，聚（2,5-双（3-十二烷基-2-噻吩基）噻吩并[3,2-b]噻吩）（C-12-PBTTT）和区域规则的聚（3-己基噻吩（P3HT）。取向膜的FeCl3掺杂导致电荷电导率高达2 x 10（5）S cm（-1），并且具有类似于碘掺杂的聚乙炔的类金属热电势。薄膜几乎是光学透明的，并显示强偏振的近红外极化波带（二向色比> 10）。对P3HT和C-12-PBTTT中结构性质相关性的比较研究确定了三种获得超过10（5）S cm（-1）的电导率的条件：i）实现具有高持久长度的共轭聚合物的高面内取向； ii）通过在聚合物结构中定期插入掺杂剂分子来确保聚合物主链的均匀链氧化，而不会破坏pi堆叠层的排列； iii）沿链方向保持渗透的纳米形态。高度各向异性的导电聚合物薄膜是研究热功率S与电荷电导率sigma之间关系的理想模型系统。沿着链方向普遍存在与sigma（-1/4）成比例的比例定律S，但在垂直于链的方向上观察到与-ln（sigma）关系成比例的不同S，这表明存在不同的电荷传输机制。沿链方向的电荷电导率和热功率的同时增加导致C-12-PBTTT中热电功率因数的大幅提高，最高可达2 mW m（-1）K-2。

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