Directing Solution-Phase Nucleation To Form Organic Semiconductor Vertical Crystal Arrays
Directing Solution-Phase Nucleation To Form Organic Semiconductor Vertical Crystal Arrays
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DOI：
10.1021/acs.cgd.9b00321
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发表时间：
2019-04
影响因子：
3.8
通讯作者：
Kai Zong;Yichen Ma;Kamran Shayan;J. Ly;Emily Renjilian;C. Hu;S. Strauf;A. Briseno;Stephanie S. Lee
中科院分区：
文献类型：
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作者：
Kai Zong;Yichen Ma;Kamran Shayan;J. Ly;Emily Renjilian;C. Hu;S. Strauf;A. Briseno;Stephanie S. Lee
控制溶液处理的有机半导体的面外分子取向是有机电子界的一个长期挑战。在这里，提出了一种可推广的策略，使用nanofinition直接成核的小分子有机半导体在溶液相沉积。使用一个简单的浸涂过程中，三异丙基甲硅烷基乙炔基衍生的并苯分子沉积到纳米多孔阳极氧化铝（AAO）支架的平均孔径范围从60至200 nm。发现在圆柱形AAO纳米孔内形成预取向的核，使得快速生长方向（即，π堆叠方向）与孔的长轴对齐。然后晶体生长在支架上方传播，导致形成垂直晶体阵列，其中高表面能π平面暴露在晶体尖端。这些晶体的直径和高度分别在100-600 nm和0.8-6.7 μm范围内可调。
Control over the out-of-plane molecular orientation of solution-processed organic semiconductors is a long-standing challenge in the organic electronics community. Here, a generalizable strategy using nanoconfinement to direct the nucleation of small-molecule organic semiconductors during solution-phase deposition is presented. Using a facile dip-coating process, triisopropylsilylethynyl-derivatized acene molecules were deposited onto nanoporous anodized aluminum oxide (AAO) scaffolds with average pore diameters ranging from 60 to 200 nm. Preferentially oriented nuclei were found to form within the cylindrical AAO nanopores such that the fast growth direction (i.e., the π-stack direction) aligned with the long axes of the pores. Crystal growth then propagated above the scaffold, resulting in the formation of vertical crystal arrays with the high surface energy π-planes exposed at the crystal tips. The diameters and heights of these crystals were tunable over ranges of 100–600 nm and 0.8–6.7 μm, respective...