Improving the electrical performance of organic semiconductors is critical to use them for optoelectronic applications. In this study, we analyze the mechanism of charge transfer complex (CTC) formation at the interface between organic and inorganic semiconductors through extensive optical and electrical measurements. N,N′-Bis(naphthalen-1-yl)-N,N′-bis(phenyl)benzidine (NPB) and molybdenum oxide (MoO₃) were sequentially deposited to form a donor/accepter heterojunction structure. The CTC formation and conductivity of the films were determined using UV–visible spectroscopy and transmission line method, respectively. Compared with the single layer devices, the donor/accepter heterojunction exhibits significantly enhanced conductivity. In addition, the conductivity and CTC generation efficiency of the heterojunction display strong dependence on NPB layer thickness, which originates from the variation of dipole interactions at the heterojunction interface. These results provide useful insights on interfacial doping properties, which is potentially beneficial for enhancing the understanding of organic/inorganic interfaces.

改善有机半导体的电性能对于将其用于光电应用至关重要。在这项研究中，我们通过广泛的光学和电学测量分析了有机和无机半导体之间界面处电荷转移复合物（CTC）形成的机理。N，N'-双（萘-1-基）-N，N'-双（苯基）联苯胺（NPB）和氧化钼（MoO ₃依次沉积）以形成供体/受体异质结结构。分别使用紫外可见光谱和透射线法确定了薄膜的四氯化碳形成和电导率。与单层器件相比，施主/受主异质结表现出明显增强的导电性。此外，异质结的电导率和CTC生成效率对NPB层厚度有很强的依赖性，这是由异质结界面处的偶极相互作用所引起的。这些结果提供了有关界面掺杂特性的有用见解，这可能有助于增进对有机/无机界面的理解。