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Origin of the energy level alignment at organic/organic interfaces: The role of structural defects

机译：能级对齐在有机/有机界面的起源：结构缺陷的作用

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摘要

In this paper, the electronic properties of as-deposited and N_2-exposed CuPc/F_(16)CuPc interface, a prototype system for organic photovoltaic applications, are investigated by using ultralow background, high-sensitivity photoemission spectroscopy. It is found that (ⅰ) N_2 exposure significantly modifies the energy level alignment (ELA) at the interface between CuPc and F_(16)CuPc layer and (ⅱ) the direction of the N_2-induced energy level shift of the CuPc depends on the position of the Fermi level (E_F) in the CuPc highest occupied molecular orbital-lowest unoccupied molecular orbital gap of the as-deposited film. These observations are related to the changes in the density of gap states (DOGS) produced by structural imperfections in the molecular packing geometry, as introduced by the N_2 penetration into the CuPc layer. This result demonstrates the key role of structure-induced DOGS in controlling the ELA at organic/organic interfaces.
机译：本文利用超低背景，高灵敏度光发射光谱技术研究了有机光电应用原型系统沉积和暴露N_2的CuPc / F_（16）CuPc界面的电子性质。发现（ⅰ）N_2暴露显着改变了CuPc和F_（16）CuPc层之间的界面处的能级排列（ELA），并且（ⅱ）N_2诱导的CuPc的能级移动的方向取决于费米能级（E_F）在沉积薄膜的CuPc最高占据分子轨道最低最低未占据分子轨道间隙中的位置。这些观察结果与分子堆积几何结构缺陷所产生的间隙态密度（DOGS）的变化有关，这是由N_2渗入CuPc层引起的。该结果证明了结构诱导的DOGS在控制有机/有机界面处的ELA中的关键作用。

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  • 来源
    《Physical review》 |2014年第11期|115319.1-115319.7|共7页
  • 作者

    Fabio Bussolotti; Jinpeng Yang; Alexander Hinderhofer; Yuli Huang; Wei Chen; Satoshi Kera; Andrew T. S. Wee; Nobuo Ueno;

  • 作者单位

    Department of Nanomaterial Science, Graduate School of Advanced Integration Science, Chiba University, Chiba 263-8522, Japan;

    Department of Nanomaterial Science, Graduate School of Advanced Integration Science, Chiba University, Chiba 263-8522, Japan;

    Department of Nanomaterial Science, Graduate School of Advanced Integration Science, Chiba University, Chiba 263-8522, Japan;

    Department of Nanomaterial Science, Graduate School of Advanced Integration Science, Chiba University, Chiba 263-8522, Japan;

    Department of Chemistry, National University of Singapore, 3 Science Drive 3,117543, Singapore ,Department of Physics, National University of Singapore, 3 Science Drive 3,117542, Singapore;

    Department of Nanomaterial Science, Graduate School of Advanced Integration Science, Chiba University, Chiba 263-8522, Japan;

    Department of Physics, National University of Singapore, 3 Science Drive 3,117542, Singapore;

    Department of Nanomaterial Science, Graduate School of Advanced Integration Science, Chiba University, Chiba 263-8522, Japan;

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  • 正文语种 eng
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  • 关键词

    adsorbed layers and thin films; polymers and organic compounds;

    机译：吸附层和薄膜;聚合物和有机化合物;

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