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Two-dimensional charge transport in self-organized, high-mobility conjugated polymers

机译：自组织，高迁移率共轭聚合物中的二维电荷传输

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Self-organization in many solution-processed, semiconducting conjugated polymers results in complex microstructures, in which ordered microcrystalline domains are embedded in an amorphous matrix. This has important consequences for electrical properties of these materials: charge transport is usually limited by the most difficult hopping processes and is therefore dominated by the disordered matrix, resulting in low charge-carrier mobilities (≤ 10~(-5) cm~2 V~(-1) s~(-1)). Here we use thin-film, field-effect transistor structures to probe the transport properties of the ordered microcrystalline domains in the conjugated polymer poly(3-hexylthiophene), P3HT. Self-organization in P3HT results in a lamella structure with two-dimensional conjugated sheets formed by interchain stacking. We find that, depending on processing conditions, the lamellae can adopt two different orientations—parallel and normal to the substrate—the mobilities of which differ by more than a factor of 100, and can reach values as high as 0.1 cm~2 V~(-1) s~(-1) (refs 3, 4). Optical spectroscopy of the field-induced charge, combined with the mobility anisotropy, reveals the two-dimensional interchain character of the polaronic charge carriers, which exhibit lower relaxation energies than the corresponding radical cations on isolated one-dimensional chains. The possibility of achieving high mobilities via two-dimensional transport in self-organized conjugated lamellae is important for applications of polymer transistors in logic circuits and active-matrix displays.
机译：在许多溶液加工的半导体共轭聚合物中，自组织导致复杂的微结构，其中有序的微晶域嵌入无定形基质中。这对这些材料的电性能具有重要影响：电荷传输通常受最困难的跳变过程限制，因此受无序矩阵支配，导致电荷载流子迁移率低（≤10〜（-5）cm〜2 V） 〜（-1）s〜（-1））。在这里，我们使用薄膜的场效应晶体管结构来探测共轭聚合物聚（3-己基噻吩）P3HT中有序微晶域的传输特性。 P3HT中的自组织会形成层状结构，并具有通过链间堆叠形成的二维共轭薄片。我们发现，根据工艺条件，薄片可以采用两种不同的方向-平行于基板并且垂直于基板-迁移率相差100倍以上，并且可以达到0.1 cm〜2 V〜的值。 （-1）s〜（-1）（参考文献3、4）。场致电荷的光谱与迁移率各向异性相结合，揭示了极化子载流子的二维链间特征，与孤立的一维链上相应的自由基阳离子相比，其弛豫能更低。在自组织共轭薄片中通过二维传输实现高迁移率的可能性，对于聚合物晶体管在逻辑电路和有源矩阵显示器中的应用非常重要。

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