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Comparison of organic and inorganic layers for structural templating of pentacene thin films†
Materials Horizons ( IF 12.2 ) Pub Date : 2019-07-30 , DOI: 10.1039/c9mh00355j Dong Kuk Kim 1, 2, 3, 4 , Daphné Lubert-Perquel 1, 2, 3, 4, 5 , Sandrine Heutz 1, 2, 3, 4, 5
Materials Horizons ( IF 12.2 ) Pub Date : 2019-07-30 , DOI: 10.1039/c9mh00355j Dong Kuk Kim 1, 2, 3, 4 , Daphné Lubert-Perquel 1, 2, 3, 4, 5 , Sandrine Heutz 1, 2, 3, 4, 5
Affiliation
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Pentacene is a key organic semiconductor, which has achieved prominence in transistor applications and as an archetypal material for singlet fission, the process whereby the absorption of one photon leads to the formation of two triplet states. Functional properties of molecules are highly anisotropic, and control over the molecular orientation in thin films with structural templating is commonly implemented as a route for governing the morphology and structure of organic films. Among the structural templating layers, 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA) and copper(I) iodide (CuI) have been shown to effectively template aromatic systems such as phthalocyanines. Here, we extend their use to pentacene thin films and find that a successful transition to a flat-lying arrangement is achieved with CuI films grown at high temperatures, but not with PTCDA. As a result, we postulate a model based on quadrupole interactions as the driving force behind the molecular orientation of pentacene. A 0.25 eV increase in work function and a two-fold increase in visible light absorption are recorded for the induced flat-lying orientation. Therefore, our templating methodology provides design opportunities for optoelectronic devices that require a predominantly flat-lying orientation.
中文翻译：
并五苯薄膜结构模板的有机层和无机层的比较†
并五苯是一种关键的有机半导体，在晶体管应用中非常重要，并作为单线态裂变的原型材料，该过程吸收一个光子导致形成两个三线态。分子的功能特性是高度各向异性的，并且通常使用结构模板控制薄膜中分子的取向，作为控制有机膜的形态和结构的途径。在结构模板层中，3,4,9,10-per四羧酸二酐（PTCDA）和铜（I碘化物（CuI）已被证明可以有效地模板化芳族体系，例如酞菁。在这里，我们将其扩展到并五苯薄膜中，发现使用高温生长的CuI薄膜可以成功地过渡到平整排列，而不能使用PTCDA。结果，我们假设一个基于四极相互作用的模型作为并五苯分子取向背后的驱动力。对于诱导的平躺取向，记录功函数增加0.25 eV和可见光吸收增加两倍。因此，我们的模板方法为要求主要为平面放置的光电设备提供了设计机会。
更新日期：2020-01-04
中文翻译：
并五苯薄膜结构模板的有机层和无机层的比较†
并五苯是一种关键的有机半导体，在晶体管应用中非常重要，并作为单线态裂变的原型材料，该过程吸收一个光子导致形成两个三线态。分子的功能特性是高度各向异性的，并且通常使用结构模板控制薄膜中分子的取向，作为控制有机膜的形态和结构的途径。在结构模板层中，3,4,9,10-per四羧酸二酐（PTCDA）和铜（I碘化物（CuI）已被证明可以有效地模板化芳族体系，例如酞菁。在这里，我们将其扩展到并五苯薄膜中，发现使用高温生长的CuI薄膜可以成功地过渡到平整排列，而不能使用PTCDA。结果，我们假设一个基于四极相互作用的模型作为并五苯分子取向背后的驱动力。对于诱导的平躺取向，记录功函数增加0.25 eV和可见光吸收增加两倍。因此，我们的模板方法为要求主要为平面放置的光电设备提供了设计机会。
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