Defect Tolerance of π-Conjugated Polymer Crystal Lattices and Their Relevance to Optoelectronic Applications
Defect Tolerance of π-Conjugated Polymer Crystal Lattices and Their Relevance to Optoelectronic Applications
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α-共轭聚合物晶格的缺陷容限及其与光电应用的相关性
DOI：
10.1021/acsapm.9b00223
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发表时间：
2019
影响因子：
5
通讯作者：
Luscombe, Christine K.
中科院分区：
文献类型：
--
作者：
Tatum, Wesley K.;Resing, Anton B.;Flagg, Lucas Q.;Ginger, David S.;Luscombe, Christine K.
本研究旨在了解聚合物链中结构缺陷对π共轭聚合物结晶和晶格的影响，这对于预测光电器件中π共轭聚合物活性层的形态和性能至关重要。这种对设备性能的预测性理解很难建立；然而，在这项工作中，自组装的聚（3-己基噻吩）纳米线（P3HT）被用来减少非晶畴的分析贡献，允许更直接的途径来探测区域缺陷和链端基对晶格的影响。通过合成具有精确变化缺陷浓度的P3HT，证明了这些缺陷可以并入晶格中，特别是区域缺陷。然而，这种结合伴随着电子性能的下降，因为减少了短程有序和晶格畸变。庞大的端基可以并入晶格中，尽管人们倾向于将它们排除在外。然而，使用π -π相互作用的端基，如甲苯，被证明可以减轻端基掺入对晶格的破坏。事实上，π -π相互作用的端基似乎促进了长程有序和晶体生长。此外，研究发现，将聚合物的分子量调整为观察到的晶片宽度lc的整数倍，可以通过促进端基从晶格中排除，使晶体的融合焓ΔHf增加多达20%。这些结果表明，π共轭聚合物晶格具有较强的抗破坏能力，从而可以保持其长程秩序。此外，本研究强调了在π共轭聚合物的设计和实现过程中需要考虑聚合物链中的结构缺陷及其对晶格的影响。
This work seeks to understand the role of structural defects in the polymer chain on the crystallization and crystal lattice of π-conjugated polymers, which is crucial for being able to predict morphology and performance of π-conjugated polymer active layers in optoelectronic devices. Such a predictive understanding of device performance has been difficult to establish; however, in this work self-assembled nanowires of poly(3-hexylthiophene) (P3HT) are used to reduce analytical contributions from amorphous domains, allowing a more direct path to probe the effect of regio-defects and chain end-groups on the crystal lattice. By use of P3HT synthesized to have precisely varied defect concentrations, it was demonstrated that these defects can be incorporated into the crystal lattice, particularly regio-defects. However, this incorporation comes with a decrease in electronic properties as a result of diminished short-range order and lattice distortions. Bulky end-groups can be incorporated into the lattice, although there is a preference for their exclusion. However, the use of π–π interacting end-groups, such as toluene, is shown to mitigate disruption to the crystal lattice that results from the end-group incorporation. In fact, π–π interacting end-groups seem to promote long-range order and crystal growth. Additionally, it was found that tuning the molecular weight of the polymer to an integer multiple of the observed width of the crystal lamellae,lc, can increase the enthalpy of fusion, ΔHf, for the crystal by as much as 20% by facilitating the exclusion of end-groups from the crystal lattice. These results demonstrate that π-conjugated polymer crystal lattices have a high tolerance for disruptions to short-range order so that long-range order can be preserved. In addition, this study underscores the need to consider structural defects in polymer chains and their consequences on the crystal lattice during the design and implementation of π-conjugated polymers.
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影响因子：
5.5
作者：
Snyder, Chad R.;Henry, Jessica S.;DeLongchamp, Dean M.
通讯作者：
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影响因子：
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作者：
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影响因子：
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影响因子：
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作者：
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通讯作者：
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影响因子：
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作者：
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