Polymorph-Selective Preparation and Structural Characterization of Perylene Single Crystals
Polymorph-Selective Preparation and Structural Characterization of Perylene Single Crystals
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DOI：
10.1021/acs.cgd.5b01130
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发表时间：
2015-10
影响因子：
3.8
通讯作者：
A. Pick;Michael Klues;A. Rinn;K. Harms;S. Chatterjee;G. Witte
中科院分区：
文献类型：
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作者：
A. Pick;Michael Klues;A. Rinn;K. Harms;S. Chatterjee;G. Witte
以多晶结构出现的有机半导体为不同晶体结构下光电激发的基础研究提供了良好的模型系统。苝是一种典型的多环芳烃，具有α-相和β-相两种多晶型，采用不同的分子填充基序。然而，高质量单晶的生长具有适当的尺寸和多晶选择性仍然是一个挑战。在这项研究中，我们比较了不同的多晶选择性苝单晶生长方法。虽然这两种多晶型的晶体都是从甲苯溶液中获得的（通过饱和溶液的冷却或溶剂的蒸发），但它们表现出许多缺陷，而且它们的大小不能精确控制。气相沉积和再升华有利于α-晶体的形成，这可以通过最初形成的新确定的薄膜相来解释。进一步，我们证明了有机分子束沉积在…
Organic semiconductors occurring in polymorphic structures represent excellent model systems for fundamental studies of optoelectronic excitations in different crystalline configurations. Perylene is an archetypal polycyclic aromatic hydrocarbon appearing in two polymorphs known as α- and β-phases which adopt different molecular packing motifs. However, the growth of high quality single crystals with appropriate sizes and polymorph selectivity remains challenging. In this study, we compare various approaches toward polymorph-selective perylene single-crystal growth. Though crystals of both polymorphs are obtained from toluene solution (either by cooling of a saturated solution or by evaporation of the solvents), they exhibit numerous defects and their size cannot be precisely controlled. Vapor deposition and resublimation favor the formation of α-crystals which can be rationalized by a newly identified thin-film phase that forms initially. Further, we demonstrate that organic molecular beam deposition ont...