Formation of solid-state excitons in ultrathin crystalline films of PTCDA: from single molecules to molecular stacks.
Formation of solid-state excitons in ultrathin crystalline films of PTCDA: from single molecules to molecular stacks.
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DOI：
10.1103/physrevlett.93.097403
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发表时间：
2004-08
影响因子：
8.6
通讯作者：
H. Proehl;T. Dienel;R. Nitsche;T. Fritz
中科院分区：
文献类型：
--
作者：
H. Proehl;T. Dienel;R. Nitsche;T. Fritz
我们直接遵循的吸收光谱从一个单一的分子到二聚体，并进一步到一维分子堆叠的演变：我们确定了有序的单层到多层膜的PTCDA（3，4，9，10-perylenetetracarboxylic dianhydride）在白云母（0001）表面的光学吸收特性的原位差分反射光谱。数据清楚地显示了从单分子到二聚体光谱的转变，然后是激子离域到分子晶体激子。伴随的光谱位移与最近的模型概念相比是有利的。
We directly follow the evolution of the absorption spectrum from a single molecule to a dimer and further to a one-dimensional molecular stack: We determine the optical absorption properties of ordered monolayer to multilayer films of PTCDA (3,4,9,10-perylenetetracarboxylic dianhydride) on muscovite mica(0001) surfaces by in situ differential reflectance spectroscopy. The data clearly show the transition from the single molecule to a dimer spectrum, followed by the exciton delocalization to a molecular crystal exciton. The accompanying spectral shifts compare favorably with recent model concepts.