The molecular ordering in organic polymer chains through π-π interactions is emerged to improve semiconductor performance. In the present work, long-range ordering of poly [2,5-bis(3-tetradecylthiophen-2-yl)thieno[3,2-b]thiophene], pBTTT-C14 fiber is optimized in mixture of good and poor solvent (chloroform+toluene) blend using the concept of solvent driven self-assembly. Here, self-assembly is introduced by ageing followed by complete dissolution at elevated temperature in solvent-mixture. UV–visible spectroscopy demonstrated that the evidence of long range pBTTT-C14 fiber when experimentation is carried out in mixture of chloroform and toluene (9:1 v/v). However, in chloroform only, aggregation is slow while in toluene, aggregation is very fast under similar conditions. The fiber growth and its size are further verified by atomic force microscopy and HRTEM exemplified that the resultant aggregation of polymer chain in nanometric (diameter∼11 nm) range. Thereafter, the change in surface potential of fiber is studied by KPFM. This fibrous polymer is further sandwiched between ITO and Al-metal in order to study its junction behaviour. Fibrous pBTTT-C14 exhibits unsymmetrical charge transport properties over its isolated analogue with ∼9 times enhancement in mobility and ∼6.5 times enhancement in forward current density under the applied potential (−1.0 V to +1.0 V). This is owing to existence of a new charge transition path along the aggregation that consists of trapped charge between π-π stacking.

通过π-π相互作用，有机聚合物链中的分子有序出现，以改善半导体性能。在本工作中，聚[2,5-双（3-十四烷基噻吩-2-基）噻吩并[3,2- b[噻吩]，pBTTT-C14纤维使用溶剂驱动的自组装概念，在好溶剂和不良溶剂（氯仿+甲苯）混合物的混合物中进行了优化。在此，通过老化引入自组装，然后在高温下完全溶解在溶剂混合物中。紫外可见光谱法表明，当在氯仿和甲苯的混合物（9：1 v / v）中进行实验时，有长程pBTTT-C14纤维的证据。但是，仅在氯仿中，聚集缓慢，而在甲苯中，在类似条件下聚集非常快。通过原子力显微镜进一步验证了纤维的生长及其尺寸，HRTEM证明了所得聚合物链在纳米（直径〜11 nm）范围内的聚集。此后，通过KPFM研究纤维表面电势的变化。该纤维聚合物还被夹在ITO和铝金属之间，以研究其结合行为。纤维状pBTTT-C14在其分离的类似物上表现出不对称的电荷传输特性，在施加的电势（-1.0 V至+1.0 V）下，迁移率提高了约9倍，正向电流密度提高了约6.5倍。这是由于沿着聚集体存在一个新的电荷跃迁路径，该路径由π-π堆叠之间的捕获电荷组成。