Organic semiconductor interfaces for molecular electronics

有机半导体将传统上与无机材料相关的半导体特性与塑料更理想的特性结合在一起。此外，这些材料的有机合成允许在调节它们的电子和光学性质方面有很大的灵活性。通过结合这些性质，有机半导体，如共轭聚合物，已被证明是发光二极管、晶体管和光伏电池的活性材料。另一方面，这些共轭聚合物提供了一种新的方式来看待与电子使用分子相关的许多广泛的基本科学问题，这些问题在许多不同的材料系统中探索到了单分子尺度。控制电子学分子行为的大量物理现象发生在有机-有机界面上。因此，对有机界面的了解对分子电子学的成功至关重要。对一系列控制良好的不同长度尺度的链间和链内异质结的有机界面的研究是这一提议的中心主题，重点是分子尺度的电子结构和这些界面上的电子过程。我们将首先研究从微米到分子尺度的基于共轭聚合物的各种有机半导体链间和链内异质结。在这些异质结上，我们将探索电子物种和电荷载流子的光物理、电子学和操作动力学。通过这个项目，将在了解这些有机-有机界面的基础上处理分子尺度的电子学。

Organic semiconductors combine the semiconductor properties traditionally associated with inorganic materials with the more desirable properties of plastics. Moreover, the organic syntheses of these materials allow for great flexibility in the tuning of their electronic and optical properties. By combining these properties, organic semiconductors such as conjugated polymers have been demonstrated as the active material in light-emitting diodes, transistors, and photovoltaic cells. On the other hand, these conjugated polymers provide a new way of looking at many of the broad fundamental scientific issues related to using molecules for electronics, which are explored in many different materials systems down to the single-molecule scale. A great deal of the physics, which governs the behaviour of molecules for electronics, occurs at the organic-organic interfaces. Therefore, understanding of the organic interfaces is crucial to the success of molecular electronics. The organic interface study of a range of well-controlled inter-chain and intra-chain heterojunctions with different length-scales is the central theme of this proposal, with an important focus on molecular-scale electronic structures and electronic processes across these interfaces. We will first examine various organic semiconductor inter- and intra-chain heterojunctions based on conjugated polymers from micron- to molecular-scale. At these heterojunctions, we will then explore photophysical, electronic, and operational dynamics of electronic species and charge-carriers. Through this project, molecular-scale electronics will be addressed on the basis of understanding of these organic-organic interfaces.