Two-Dimensional Diffusion of Excitons in a Perylene Diimide Monolayer Quenched by a Fullerene Heterojunction
Two-Dimensional Diffusion of Excitons in a Perylene Diimide Monolayer Quenched by a Fullerene Heterojunction
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DOI：
10.1021/acs.jpcc.9b01413
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发表时间：
2019-04
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通讯作者：
J. Kerfoot;V. Korolkov;S. Svatek;Manal M. Alkhamisi;T. Taniguchi;Kenji Watanabe;P. Parkinson;P. Beton
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文献类型：
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作者：
J. Kerfoot;V. Korolkov;S. Svatek;Manal M. Alkhamisi;T. Taniguchi;Kenji Watanabe;P. Parkinson;P. Beton
有机异质结的结构和功能特性在有机器件的操作中起着至关重要的作用，但由于通常形成的掩埋界面，它们的特性难以直接测量。我们生长了由两个单层厚的有机半导体组成的模型异质结，并使用这些双层来探索激子的二维动力学。异质结构是通过在六方氮化硼（hBN）上顺序沉积二萘嵌苯-3，4，9，10-四羧酸-3，4，9，10-二酰亚胺（PTCDI）和富勒烯（C60）的单层来形成的。这些双层的形态特征在于使用原子力显微镜，并表现出明显的差异，在hBN和PTCDI上的C60生长动力学。随着富勒烯覆盖率的增加，PTCDI-C60异质结构的荧光变化显示出与激子扩散和淬灭一致的强度降低。我们使用一个简单的模型的强度依赖性，以确定的二维…
The structural and functional properties of organic heterojunctions play a vitally important role in the operation of organic devices, but their properties are difficult to measure directly due to the buried interfaces that are typically formed. We have grown model heterojunctions consisting of two monolayer-thick organic semiconductors and used these bilayers to explore the two-dimensional dynamics of excitons. The heterostructures are formed by sequential deposition of monolayers of perylene-3,4,9,10-tetracarboxylic-3,4,9,10-diimide (PTCDI) and fullerene (C60) on hexagonal boron nitride (hBN). The morphology of these bilayers was characterized using atomic force microscopy and showed clear differences in the C60 growth kinetics on hBN and PTCDI. The variation in the fluorescence of PTCDI-C60 heterostructures with increasing fullerene coverage showed a reduction in intensity consistent with exciton diffusion and quenching. We use a simple model for the intensity dependence to determine the two-dimensiona...