AbstractThis study investigates the influence of the solvent used to prepare films of a poly(3-hexylthiophene) (P3HT) and poly(lactic acid) (PLA) blend on the morphology and charge transport mobility of field-effect transistors (FETs). Films prepared from CH2Cl2, a poor solvent for P3HT, tended to form well-defined nanowires, attributable to P3HT self-assembly via a solubility-induced process. This phenomenon resulted in a mobility of 5.30 × 10−3 cm2 (Vs)−1 and an on/off ratio of 3.23 × 103 in a CH2Cl2-solvent P3HT/PLA-blend system with a P3HT content of 10 wt%. Even a blend with 2 wt% P3HT exhibited a mobility of 1.76 × 10−3 cm2 (Vs)−1. However, in blend systems where CHCl3 solvent was employed in film preparation, the mobility decreased as the PLA content increased, and almost no electrical characteristics were exhibited at 50 wt% P3HT due to the isolated, spherical, phase-separated morphology of P3HT aggregation. Moreover, in CH2Cl2 solvent systems, the mobility of the P3HT/PLA (10/90) blend decreased from 5.3 × 10−3 cm2 (Vs)−1 (in a glove box) to 3.7 × 10−3 cm2 (Vs)−1 (after 28 days of air exposure), whereas that of 100 wt% P3HT declined by approximately one order of magnitude. These results confirm that P3HT/PLA blends prepared from CH2Cl2 solvent can be used to fabricate environmentally friendly, low-cost FETs with favorable air stability.The morphology and effects on the OFET performance of blends of various ratios of P3HT and insulating PLA using CHCl3 and CH2Cl2 as solvents were explored. It is demonstrated that a P3HT network structure within the PLA matrix could be induced using CH2Cl2. The one-dimensional nanowire morphology of these network structures may have provided an efficient pathway for OFET charge transport. These results confirm that P3HT/PLA blends in CH2Cl2 solvent could be used to fabricate low-cost, green-polymer-blended FETs.

中文翻译：

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基于聚乳酸和聚（3-己基噻吩）共混物的有机场效应晶体管的形态和光电特性

摘要本研究调查了用于制备聚（3-己基噻吩）（P3HT）和聚（乳酸）（PLA）共混物薄膜的溶剂对场效应晶体管（FET）的形态和电荷传输迁移率的影响。由 CH2Cl2（P3HT 的不良溶剂）制备的薄膜倾向于形成界限分明的纳米线，这归因于 P3HT 通过溶解性诱导过程自组装。这种现象导致在 P3HT 含量为 10 wt% 的 CH2Cl2 溶剂 P3HT/PLA 共混体系中的迁移率为 5.30 × 10-3 cm2 (Vs)-1 和 3.23 × 103 的开/关比。即使是含有 2 wt% P3HT 的混合物也表现出 1.76 × 10−3 cm2 (Vs)−1 的迁移率。然而，在薄膜制备中使用 CHCl3 溶剂的共混体系中，流动性随着 PLA 含量的增加而降低，由于 P3HT 聚集体的孤立、球形、相分离形态，在 50 wt% P3HT 下几乎没有表现出电特性。此外，在 CH2Cl2 溶剂系统中，P3HT/PLA (10/90) 混合物的迁移率从 5.3 × 10−3 cm2 (Vs)−1（在手套箱中）降低到 3.7 × 10−3 cm2 (Vs)− 1（暴露于空气 28 天后），而 100 wt% P3HT 下降了大约一个数量级。这些结果证实，由 CH2Cl2 溶剂制备的 P3HT/PLA 共混物可用于制造环境友好、低成本且具有良好空气稳定性的 FET。使用 CHCl3 和 CHCl3 和绝缘 PLA 的各种比例的 P3HT 和绝缘 PLA 共混物的形态和对 OFET 性能的影响探索了 CH2Cl2 作为溶剂。结果表明，使用 CH2Cl2 可以诱导 PLA 基质内的 P3HT 网络结构。这些网络结构的一维纳米线形态可能为 OFET 电荷传输提供了有效的途径。这些结果证实，CH2Cl2 溶剂中的 P3HT/PLA 混合物可用于制造低成本、绿色聚合物混合的 FET。