论文标题
在银上的羧酸多层中的可调能级对齐
Tunable Energy Level Alignment in the Multilayers of Carboxylic Acids on Silver
论文作者
论文摘要
需要金属电极与有机半导体之间的精确能级对齐，以降低接触电阻并提高有机 - 基于 - 基于 - 基于 - 基于 - 偏症的设备的效率。一种方法是包括介导能级对齐的层中的层中，即电荷注入层（CILS）。在这里，我们基于芳族羧酸引入单层厚的CIL，这些羧酸可以诱导随后层的能级移动，最高为0.8 eV。通过逐步化沉积分子的化学转化，我们实现了高度可调的能级变化，范围为0.5 eV。我们揭示了工作函数和能量级位置在CIL中的位置随诱导偶极子的密度线性增加。随后的层的能级位置与CIL相同。因此，我们的结果将能量对齐量（即CIL和随后的层和样品工作函数的能级位置）联系起来。高可调性将允许精确调整沉积在CIL上的活动层，这标志着在金属电极上有效的电荷注入层的路径。
The precise energy level alignment between a metal electrode and an organic semiconductor is required to reduce contact resistance and enhance the efficiency of organic-semiconductor-based devices. One of the ways is to include interlayers that mediate the energy level alignment, i.e., charge injection layers (CILs). Here we introduce the monolayer thick CILs based on the aromatic carboxylic acids that can induce the energy level shift in the subsequent layers by up to 0.8 eV. By gradual chemical transformation of the as-deposited molecules, we achieve a highly tunable energy level shift in the range of 0.5 eV. We reveal that the position of both the work function and energy-level position in the CIL increases linearly with the density of induced dipoles. The energy level position of subsequent layers changes in the same way as the CIL. Our results thus connect the energy alignment quantities, i.e., energy level positions of both CIL and subsequent layers and sample work function. The high tunability would allow precise tuning of the active layers deposited on the CIL, which marks the path towards efficient charge injection layers on metal electrodes.
