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Energy-Level Alignment at the Organic/Electrode Interface in Organic Optoelectronic Devices

机译：有机光电器件中有机/电极界面的能级对准

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摘要

It is commonly believed that the work-function reduction effect of the cathode interfacial material in organic electronic devices leads to better energy-level alignment at the organic/electrode interface, which enhances the device performance. However, there is no agreement on the exact dipole direction in the literature. In this study, a peel-off method to reveal the buried organic/metal interface to examine the energy-level alignment is developed. By splitting the device at different interfaces, it is discovered that oppositely oriented dipoles are formed at different surfaces of the interfacial layer. Moreover, the function of the electrode interface differs in different device types. In organic light-emitting diodes, the vacuum-level alignment generally occurs at the organic/cathode interface, while in organic photovoltaic devices, the Fermi-level pinning commonly happens. Both are determined by the integer charge-transfer levels of the organic materials and the work-function of the electrode. As a result, the performance enhancement by the cathode interfacial material in organic photovoltaic devices cannot be solely explained by the energy-level alignment. The clarification of the energy-level alignment not only helps understand the device operation but also sets up a guideline to design the devices with better performance.
机译：通常认为，有机电子器件中阴极界面材料的功函数降低效应导致有机/电极界面处的能级更好的对准，从而增强了器件性能。然而，在文献中关于确切的偶极子方向尚无共识。在这项研究中，开发了一种剥离方法来揭示掩埋的有机/金属界面，以检查能级排列。通过将器件在不同的界面处分开，发现在界面层的不同表面上形成了相反方向的偶极子。此外，电极接口的功能在不同的设备类型中也有所不同。在有机发光二极管中，真空能级对准通常发生在有机/阴极界面，而在有机光伏器件中，费米能级钉扎通常发生。两者都取决于有机材料的整数电荷转移能级和电极的功函。结果，不能仅通过能级对准来解释有机光伏器件中阴极界面材料的性能增强。能级对齐的澄清不仅有助于了解设备的操作，而且还为设计性能更好的设备建立了指南。

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  • 来源
    《Advanced Functional Materials》 |2016年第1期|129-136|共8页
  • 作者

    Hu Zhanhao; Zhong Zhiming; Chen Yawen; Sun Chen; Huang Fei; Peng Junbiao; Wang Jian; Cao Yong;

  • 作者单位

    S China Univ Technol, Inst Polymer Optoelect Mat & Devices, State Key Lab Luminescent Mat & Devices, Guangzhou 510640, Guangdong, Peoples R China;

    S China Univ Technol, Inst Polymer Optoelect Mat & Devices, State Key Lab Luminescent Mat & Devices, Guangzhou 510640, Guangdong, Peoples R China;

    S China Univ Technol, Inst Polymer Optoelect Mat & Devices, State Key Lab Luminescent Mat & Devices, Guangzhou 510640, Guangdong, Peoples R China;

    S China Univ Technol, Inst Polymer Optoelect Mat & Devices, State Key Lab Luminescent Mat & Devices, Guangzhou 510640, Guangdong, Peoples R China;

    S China Univ Technol, Inst Polymer Optoelect Mat & Devices, State Key Lab Luminescent Mat & Devices, Guangzhou 510640, Guangdong, Peoples R China;

    S China Univ Technol, Inst Polymer Optoelect Mat & Devices, State Key Lab Luminescent Mat & Devices, Guangzhou 510640, Guangdong, Peoples R China;

    S China Univ Technol, Inst Polymer Optoelect Mat & Devices, State Key Lab Luminescent Mat & Devices, Guangzhou 510640, Guangdong, Peoples R China;

    S China Univ Technol, Inst Polymer Optoelect Mat & Devices, State Key Lab Luminescent Mat & Devices, Guangzhou 510640, Guangdong, Peoples R China;

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