In the field of organic electronics, organizing crystals into structures that promote efficient optoelectronic processes during rapid solution processing remains an outstanding challenge. Here, nanopillar grids are employed to direct the crystallization of organic semiconductor perylene during continuous solution-phase dip coating. These platelike crystals are found to orient in two distinct out-of-plane orientations with the large-area faces either parallel or perpendicular to the substrate surface. Perpendicular crystals are further found to adopt the underlying grid ordering, with crystals preferentially growing between the rows and columns of nanopillars to form structures resembling trellises. This observation of graphoepitaxy is a consequence of registry between the periodicity of the nanopillar grid and the growth habit of perylene, resulting in three-dimensional structures with ordering spanning the molecular to micrometer length scale. The ability to direct crystals into hierarchical structures with optimized orientations, surface areas, and sizes will have broad implications across materials disciplines.

中文翻译：

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石墨外延定向的有机半导体单晶组装成网格结构

在有机电子领域，将晶体组织成在快速溶液处理过程中促进有效光电过程的结构仍然是一项艰巨的挑战。在此，在连续的溶液相浸涂过程中，采用纳米柱栅来引导有机半导体per的结晶。发现这些板状晶体以两种不同的面外取向取向，其中大面积面平行于或垂直于基材表面。进一步发现垂直晶体采用下面的网格顺序，其中晶体优先生长在纳米柱的行和列之间，以形成类似于格子的结构。对石墨外延的这种观察是纳米柱状网格的周期性与of的生长习性之间的配准的结果，产生三维结构，其排列顺序从分子到微米的长度尺度。将晶体定向到具有最佳方向，表面积和尺寸的分层结构的能力将在整个材料学科中产生广泛的影响。