An effect of molecular motion on carrier formation in a poly(3-hexylthiophene) film.
An effect of molecular motion on carrier formation in a poly(3-hexylthiophene) film.
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DOI：
10.1038/srep08436
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发表时间：
2015-02-13
影响因子：
4.6
通讯作者：
Tanaka K
中科院分区：
文献类型：
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作者：
Ogata Y;Kawaguchi D;Tanaka K
共轭聚合物中的自由载流子极化子(P)对光电子器件的性能起着至关重要的作用。在这里，我们提供了可靠的证据，证明在零电场下，P可以主要由聚(3-己基噻吩基)(P3HT)薄膜中的极化子对(PP)产生。PP中磷的生成强烈依赖于温度。P的温度依赖关系在30 0 K左右开始变化，在此温度范围内，P3HT表现出一种称为α1弛豫过程的热分子运动，在该过程中，噻吩环的扭转运动被释放.因此，可以说，P3HT噻吩环的扭转运动是决定P在P3HT薄膜中光动力学的因素之一。这一发现适用于不同烷基长度的聚噻吩型S，在设计和构建基于聚噻吩型S的高功能化有机器件时应予以考虑。
Free carriers, polarons (P), in conjugated polymers play a key role in the performance of optoelectronic devices. Here, we present solid evidence that P can be predominantly generated from polaron pairs (PP) in a poly(3-hexylthiophene) (P3HT) film under zero electric field. P formation from PP strongly depends on temperature. The temperature dependence of P starts to change around 300 K. P3HT exhibits a thermal molecular motion named the α1 relaxation process, in which the twisting motion of thiophene rings is released, in this temperature region. Thus, it can be claimed that the twisting motion of P3HT thiophene rings is one of the determining factors of the photodynamics of P in P3HT films. This finding holds true for poly(thiophene)s with different alkyl lengths and should be considered in the design and construction of highly-functionalized organic devices based on poly(thiophene)s.