Semi-paracrystallinity in semi-conducting polymers
Semi-paracrystallinity in semi-conducting polymers
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DOI：
10.1039/d1mh01349a
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发表时间：
2021-12-15
影响因子：
13.3
通讯作者：
Martin, Jaime
中科院分区：
文献类型：
--
作者：
Marina, Sara;Gutierrez-Fernandez, Edgar;Martin, Jaime
准确确定半导体聚合物的结构结构对有机电子技术中半导体材料的进一步发展具有重要意义。然而，之前对一些性能最好的晶体管和光伏应用材料的表征，这些材料是基于具有刚性骨架的聚合物，往往会导致复杂的问题，其中X射线散射和显微镜得出的结果似乎相互矛盾。在这里，我们通过引入一种新的结构模型，即半准晶组织来解决这一悖论。该模型确定了这些材料的微结构依赖于嵌入在更无序的基质中的小的准晶微区的密集阵列。因此，总体结构有序性依赖于两个参数：新的准晶程度概念(即，首次引入的准晶体积/质量分数)和准晶磁区的晶格变形参数(来自X射线散射的g参数)。模型的结构参数与长程载流子输运相关联，表明半准晶材料中的电荷输运对准晶区的互连特别敏感。
Precise determination of structural organization of semi-conducting polymers is of paramount importance for the further development of these materials in organic electronic technologies. Yet, prior characterization of some of the best-performing materials for transistor and photovoltaic applications, which are based on polymers with rigid backbones, often resulted in conundrums in which X-ray scattering and microscopy yielded seemingly contradicting results. Here we solve the paradox by introducing a new structural model, i.e., semi-paracrystalline organization. The model establishes that the microstructure of these materials relies on a dense array of small paracrystalline domains embedded in a more disordered matrix. Thus, the overall structural order relies on two parameters: the novel concept of degree of paracrystallinity (i.e., paracrystalline volume/mass fraction, introduced here for the first time) and the lattice distortion parameter of paracrystalline domains (g-parameter from X-ray scattering). Structural parameters of the model are correlated with long-range charge carrier transport, revealing that charge transport in semi-paracrystalline materials is particularly sensitive to the interconnection of paracrystalline domains.