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Multi-Charged Conjugated Polyelectrolytes as a Versatile Work Function Modifier for Organic Electronic Devices

机译：多电荷共轭聚电解质作为有机电子设备的多功能功函数改性剂

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摘要

Despite the excellent work function adjustability of conjugated polyelectrolytes (CPEs), which induce a vacuum level shift via the formation of permanent dipoles at the CPE/metal electrode interface, the exact mechanism of electron injection through the CPE electron transport layer (ETL) remains unclear. In particular, understanding the ionic motion within the CPE ETLs when overcoming the sizable injection barrier is a significant challenge. Because the ionic functionality of CPEs is a key component for such functions, a rigorous analysis using highly controlled ion density (ID) in CPEs is crucial for understanding the underlying mechanism. Here, by introducing a new series of CPEs with various numbers of ionic functionalities, energy level tuning at such an interface can be determined directly by adjusting the ID in the CPEs. More importantly, these series CPEs indicate that two different mechanisms must be invoked according to the CPE thickness. The formation of permanent interfacial dipoles is critical with respect to electron injection through CPE ETL (≤ 10 nm, quantum mechanical tunneling limit), whereas electron injection through thick CPE ETL (20-30 nm) is dominated by the reorientation of the ionic side chains under a given electric field.
机译：尽管共轭聚电解质（CPE）具有出色的功函数可调节性，可通过在CPE /金属电极界面上形成永久偶极子来引起真空能级移动，但通过CPE电子传输层（ETL）注入电子的确切机理仍不清楚。特别是，在克服较大的注入壁垒时，了解CPE ETL中的离子运动是一项重大挑战。由于CPE的离子功能性是此类功能的关键组成部分，因此在CPE中使用高度受控的离子密度（ID）进行严格的分析对于理解其基本机理至关重要。在这里，通过引入一系列具有各种离子官能度的CPE，可以直接通过调整CPE中的ID来确定这种界面上的能级调节。更重要的是，这些系列CPE指示必须根据CPE厚度调用两种不同的机制。对于通过CPE ETL（≤10 nm，量子机械隧穿极限）的电子注入，形成永久界面偶极子至关重要，而通过厚CPE ETL（20-30 nm）的电子注入主要由离子侧链的重新取向决定在给定的电场下。

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  • 来源
    《Advanced Functional Materials》 |2014年第8期|1100-1108|共9页
  • 作者

    Byoung Hoon Lee; In Hwan Jung; Han Young Woo; Hong-Ku Shim; Geunjin Kim; Kwanghee Lee;

  • 作者单位

    School of Materials Science and Engineering Heeger Center for Advanced Materials Research Institute for Solar and Sustainable Energies Gwangju Institute of Science and Technology Gwangju, 500-712, Korea;

    Department of Chemistry Korea Advanced Institute of Science and Technology Daejeon, 305-701, Korea;

    Department of Cogno-Mechatronics Engineering (WCU) Pusan National University Miryang, 627-706, Korea;

    Department of Chemistry Korea Advanced Institute of Science and Technology Daejeon, 305-701, Korea;

    School of Materials Science and Engineering Heeger Center for Advanced Materials Research Institute for Solar and Sustainable Energies Gwangju Institute of Science and Technology Gwangju, 500-712, Korea;

    School of Materials Science and Engineering Heeger Center for Advanced Materials Research Institute for Solar and Sustainable Energies Gwangju Institute of Science and Technology Gwangju, 500-712, Korea;

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