General Strategy for Self-Assembly of Highly Oriented Nanocrystalline Semiconducting Polymers with High Mobility
General Strategy for Self-Assembly of Highly Oriented Nanocrystalline Semiconducting Polymers with High Mobility
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DOI：
10.1021/nl500758w
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发表时间：
2014-05-01
期刊：
影响因子：
10.8
通讯作者：
Heeger, Alan J.
中科院分区：
文献类型：
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作者：
Luo, Chan;Kyaw, Aung Ko Ko;Heeger, Alan J.
溶液可加工的半导体聚合物具有优异的成膜能力和机械柔韧性，被认为是传统无机半导体最先进的替代品之一。然而，聚合物链的随机排列和聚合物基体的无序性通常会导致低电荷传输迁移率(10-5-10-2 cm（2) V-1 s(-1)）。这些低流动性损害了它们的性能和发展。在这里，我们提出了一种策略，利用毛细作用，介导聚合物链自组装和单向排列在纳米沟槽底。我们设计了一个由功能化玻璃间隔层分隔的夹层隧道系统，以诱导毛细作用来控制聚合物的纳米结构、结晶度和电荷输运。利用毛细管作用，我们证明了在晶体管通道长度为80 μ m的两种不同的半导体聚合物上，饱和迁移率的平均值分别为21.3和18.5 cm(2) V-1 s（-1）。这些值受到源漏接触电阻R-c的限制。使用更长的通道长度为140 μ m，其中接触电阻不太重要，我们测量了mu(h) = 36.3 cm(2) v(-1) s（-1）。外推到无限通道长度，其中R-c不重要，聚[4-(4,4-二十六基- 4h -环五[1,2-b:5,21-b']二噻吩-2-基]- alt[1,2,5]-噻二唑[3,4-c]吡啶]（M = 140 kDa）在这种链排列和结构顺序下的固有迁移率为mu(h)近似于47 cm(2) v(-1) s（-1）。我们的研究结果为实现高性能、溶液可加工和低成本的有机电子产品创造了一条有希望的途径。
Solution processable semiconducting polymers with excellent film forming capacity and mechanical flexibility are considered among the most progressive alternatives to conventional inorganic semiconductors. However, the random packing of polymer chains and the disorder of the polymer matrix typically result in low charge transport mobilities (10-5-10-2 cm(2) V-1 s(-1)). These low mobilities compromise their performance and development. Here, we present a strategy, by utilizing capillary action, to mediate polymer chain self-assembly and unidirectional alignment on nanogrooved substrates. We designed a sandwich tunnel system separated by functionalized glass spacers to induce capillary action for controlling the polymer nanostructure, crystallinity, and charge transport. Using capillary action, we demonstrate saturation mobilities with average values of 21.3 and 18.5 cm(2) V-1 s(-1) on two different semiconducting polymers at a transistor channel length of 80 mu m. These values are limited by the source-drain contact resistance, R-c. Using a longer channel length of 140 mu m where the contact resistance is less important, we measured mu(h) = 36.3 cm(2) v(-1) s(-1). Extrapolating to infinite channel length where R-c is unimportant, the intrinsic mobility for poly[4-(4,4-dihexadecyl-4H-cyclopenta[1,2-b:5,21-b']dithiophen-2-yl)-alt[1,2,5]-thiadiazolo[3,4-c]pyridine] (M = 140 kDa) at this degree of chain alignment and structural order is mu(h) approximate to 47 cm(2) v(-1) s(-1). Our results create a promising pathway toward high performance, solution processable, and low-cost organic electronics.