Molecular structure and carrier dynamics at the interface betweenorganic semiconductor and insulator

阐明有机半导体中的电荷转移机制具有重要意义。在本研究中，我们利用电荷调制光谱（CMS）研究了注入有机半导体和绝缘体界面的空穴的电子结构。我们开发了一种将CMS应用于传统透射率配置无法探测的不透明器件的方法。此外，我们发现DNTT薄膜晶体管中空穴的CM光谱与分子两端引入的烷基链长度有关。对光谱的理论分析使我们能够推断出电荷转移概率和分子构型之间的关系。

It is vital to clarify the charge transfer mechanism in organic semiconductors. In this study, we explored the electronic structures of holes injected at the interface between organic semiconductor and insulator by charge modulation spectroscopy (CMS). We developed a method to apply CMS to opaque devices that cannot be probed by the conventional transmittance configuration. In addition, we found that the CM spectra of holes in DNTT thin film transistors depend on the alkyl chain length introduced both ends of the molecule. A theoretical analysis of the spectra allowed us to deduce a correlation between charge transfer probability and molecular configurations.