Identification of polymorphs of pentacene
Identification of polymorphs of pentacene
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DOI：
10.1016/s0379-6779(02)00467-8
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发表时间：
2003-07-04
期刊：
影响因子：
4.4
通讯作者：
Palstra, TTM
中科院分区：
文献类型：
--
作者：
Mattheus, CC;Dros, AB;Palstra, TTM
并五苯以层状结构结晶，层内具有人字形排列。电子性质强烈依赖于层内分子的堆叠[J. Phys. Chem. B. 106（2002）8288]。我们已经合成了四种不同的并五苯多晶型物，通过它们的层周期d（001）鉴定：14.1、14.4、15.0和15.4埃。单晶通常采用14.1埃结构，而所有四种多晶型物都可以以薄膜形式合成，这取决于生长条件。通过X-射线衍射和电子衍射（艾德）确定了这些多晶型物的部分晶胞参数。15.0和15.4 X多晶型物在升高的温度下分别转化为14.1和14.4埃多晶型物。使用SCLC测量，我们确定14.1埃多晶型物在室温下的迁移率为0.2 cm（2）/V s。(C)2002 Elsevier Science B. V.保留所有权利。
Pentacene crystallizes in a layered structure with a herringbone arrangement within the layers. The electronic properties depend strongly on the stacking of the molecules within the layers [J. Phys. Chem. B. 106 (2002) 8288]. We have synthesized four different polymorphs of pentacene, identified by their layer periodicity, d(001): 14.1, 14.4, 15.0 and 15.4 Angstrom. Single crystals commonly adopt the 14.1 Angstrom structure, whereas all four polymorphs can be synthesized in thin film form, depending on growth conditions. We have identified part of the unit cell parameters of these polymorphs by X-ray and electron diffraction (ED). The 15.0 and 15.4 X polymorphs transform at elevated temperature to the 14.1 and 14.4 Angstrom polymorphs, respectively. Using SCLC measurements, we determined the mobility of the 14.1 Angstrom polymorph to be 0.2 cm(2)/V s at room temperature. (C) 2002 Elsevier Science B.V. All rights reserved.