Effect of polar side chains on neutral and p-doped polythiophene
Effect of polar side chains on neutral and p-doped polythiophene
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DOI：
10.1039/d0tc04290k
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发表时间：
2020-12-07
影响因子：
6.4
通讯作者：
Nielsen, Christian B.
中科院分区：
文献类型：
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作者：
Finn, Peter A.;Jacobs, Ian E.;Nielsen, Christian B.
在有机半导体材料上引入极性侧链最近已用于热电材料中以增加掺杂剂：半导体的可溶解性和稳定性，从而进一步增加器件的性能和耐久性。然而，与非极性烷基侧链相比，极性侧链如何影响聚噻吩的结构和能量学的研究通常使用没有共同形态结构的材料进行。在这项工作中，我们系统地研究了极性侧链含量的增加对聚（3-己基噻吩）（P3 HT）和光学，电化学和结构性能的影响。我们发现随着极性侧链含量的增加，聚集程度降低，导致载流子迁移率降低。在掺杂与2，3，5，6-四氟-7，7，8，8-四氰基醌二甲烷（F4 TCNQ），我们发现，电导率降低时，纳入极性侧链和退火时，掺杂的薄膜在升高的温度没有表现出稳定的效果。这项研究强调，极性功能并不总是增加掺杂剂：半导体相互作用，并可能损害所需的结构和电气特性，因此应谨慎纳入有机半导体。
Incorporation of polar side chains on organic semiconducting materials have been used recently in thermoelectric materials to increase dopant:semiconductor miscibility and stability to further increase the performance and durability of devices. However, investigations into how polar side chains can affect the structure and energetics of polythiophenes compared to non-polar alkyl side chains are usually carried out using materials with no common morphological structure. Within this work we systematically investigate the increase in polar side chain content on poly(3-hexylthiophene) (P3HT) and how the optical, electrochemical, and structural properties are affected. We find a decreasing degree of aggregation with increasing polar side chain content leading to lower charge carrier mobilities. Upon doping with 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4TCNQ), we find that the electrical conductivity is reduced when incorporating the polar side chain and no stabilising effect is demonstrated when annealing the doped thin films at raised temperatures. This study emphasises that polar functionalities do not always increase dopant:semiconductor interactions and can harm desirable structural and electrical characteristics, and therefore should be incorporated into organic semiconductors with caution.