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Performance improvement of P3HT nanowire-based organic solar cells by interfacial morphology engineering

机译：基于P3HT纳米线的有机太阳能电池的性能改进界面形态学

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摘要

Poly (3-hexylthiophene-2,5-diyl) nanowires (nw-P3HT) have been a great interest for organic electronics, including organic field-effect transistors, organic photodetectors, organic photovoltaics, etc due to easy formation in the solution process. Thus both explanations of charge transport dynamics and morphology are crucial for device performance. Here we demonstrated the optoelectronic properties of the P3HT nanowires where the polymer backbones were parallel to the nanowire axis. The nanowires tended to form a bundle due to van der Waals interactions. Nanowire bundles were separated by 1,8-diiodooctane (DIO) additive for photovoltaic fabrication. The bundle separation was visualized by atomic force microscopy. The charge transfer mechanism was evaluated by electrochemical impedance spectroscopy. The electrical analysis showed that short-circuit current density (J(sc)) increases to 10.74 mA cm(-2) after the bundle separation. According to impedance analysis, there is a correlation between effective lifetime and DIO ratio. These findings were considered as promising results for improving the transport by forming pathways for charge carriers.
机译：聚（3-己基噻吩-2,5-二酰基）纳米线（nw-P3HT）由于在溶液过程中易于形成，已成为有机电子学领域的一个研究热点，包括有机场效应晶体管、有机光电探测器、有机光伏等。因此，电荷输运动力学和形态的解释对器件性能至关重要。在这里，我们展示了聚合物主链平行于纳米线轴的P3HT纳米线的光电特性。由于范德华相互作用，纳米线倾向于形成一束。纳米线束由1,8-二碘辛烷（DIO）添加剂分离，用于光伏制造。原子力显微镜观察到束分离。通过电化学阻抗谱对电荷转移机理进行了评价。电学分析表明，在束分离后，短路电流密度（J（sc））增加到10.74 mA cm（-2）。根据阻抗分析，有效寿命和DIO比之间存在相关性。这些发现被认为是通过形成电荷载流子通道来改善传输的有希望的结果。

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