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arXiv 1902.01640physics.app-phcond-mat.mtrl-sci
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电极/半导体界面电荷注入势垒的偶极转换作为有机器件水致不稳定性的机制

Dipolar Switching of Charge-Injection Barriers at Electrode/Semiconductor Interfaces as a Mechanism for Water-Induced Instabilities of Organic Devices

Ryo Nouchi

摘要:

提出了一种与电极接触相关的有机电子器件工作不稳定性的机制,并通过观察在电极/有机半导体界面处的电荷注入势垒的水诱导变化来证实。空气中的水分子通过扩散渗透到有机晶体中,并且外部电场使水分子的电偶极子在电极表面取向,导致电荷注入势垒高度的偶极切换。作为开关的结果,两端Au-rubrene-Au器件的电流-电压曲线从对称变为不对称,表现出二极管式整流和二极管极性的可逆开关。该器件在3 V的开关电压下显示出最高的电流开关比267,对应于>144 meV的电极功函数变化。本文提出的机制将是重要的,特别是短沟道有机器件,这是必不可少的应用,如有机集成电路。

英文摘要:

An electrode contact-related mechanism for the operational instability of organic electronic devices is proposed and confirmed via observation of a water-induced change in charge-injection barrier eights at the electrode/organic-semiconductor interfaces. Water molecules in air penetrate into the organic crystal via diffusion, and an external electric field orients the electric dipole of the water molecules at the electrode surfaces, leading to dipolar switching of the charge-injection barrier height. As a result of the switching, current-voltage curves of two-terminal Au-rubrene-Au devices change from symmetric to asymmetric, showing diode-like rectification and reversible switching of the diode polarity. The device shows the highest current switching ratio of 267 for the switching voltage of 3 V, corresponding to an electrode work function change of >144 meV. The mechanism proposed herein will be important especially for short-channel organic devices, which are indispensable for applications such as organic integrated circuits.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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