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首页> 外文期刊>Organic Electronics >Capturing transiently charged states at the C_(60)/TiO_2(HO) interface by time-resolved soft X-ray photoelectron spectroscopy
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Capturing transiently charged states at the C_(60)/TiO_2(HO) interface by time-resolved soft X-ray photoelectron spectroscopy

机译：通过时间分辨软X射线光电子能谱在C_（60）/ TiO_2（HO）界面捕获瞬态电荷状态

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摘要

Time-resolved soft X-ray photoelectron spectroscopy is utilized to determine an energy level alignment and the photoexcited carrier dynamics at a C_(60)/TiO_2(110) interface. The interface electronic structure is characterized by a type Ⅱ junction, which favors an injection of photoexcited electrons from C_(60) to TiO_2 Ultraviolet (UV) laser pulse irradiation induces transient shifts of both C 1s and Ti 2p core levels towards the higher binding energies. These energy shifts are caused by a laser-induced charge transfer between the C_(60) layer and the TiO_2(110) surface. Upon UV absorption, valence electrons of C_(60) are promoted to unoccupied levels, followed by a resonant transfer to TiO_2, leaving C_(60) in a cationized state. On the TiO_2(110) side, the electrons are injected into the conduction band to raise the carrier density so that downward bending of the TiO_2 band is induced. The UV-excited states of C_(60) and TiO_2 have sufficiently longer lifetime than the lifetime of the electron-hole pairs in solid C_(60). The C_(60)/TiO_2(110) interface is, thus, proved to be efficient for separating the electron-hole pairs generated within the C_(60) layer.
机译：时间分辨的软X射线光电子能谱用于确定能级对准和C_（60）/ TiO_2（110）界面处的光激发载流子动力学。界面电子结构的特征在于Ⅱ型结，这有利于将光激发电子从C_（60）注入TiO_2紫外线（UV）激光脉冲辐照引起C 1s和Ti 2p核能级向更高的结合能的瞬时转变。 。这些能量移动是由C_（60）层和TiO_2（110）表面之间的激光感应电荷转移引起的。吸收紫外线后，C_（60）的价电子被提升到未占据的水平，随后共振转移到TiO_2，使C_（60）处于阳离子化状态。在TiO_2（110）侧，电子被注入导带中以提高载流子密度，从而引起TiO_2带的向下弯曲。 C_（60）和TiO_2的紫外线激发态的寿命比固态C_（60）中电子-空穴对的寿命足够长。因此，证明了C_（60）/ TiO_2（110）界面对于分离在C_（60）层内产生的电子-空穴对是有效的。

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  • 来源
    《Organic Electronics》 |2016年第4期|98-103|共6页
  • 作者

    Kenichi Ozawa; Susumu Yamamoto; Ryu Yukawa; Kazuma Akikubo; Masato Emori; Hiroshi Sakama; Iwao Matsuda;

  • 作者单位

    Department of Chemistry and Materials Science, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152-8551, Japan;

    Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan;

    Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan,Institute or Materials Science, High Energy Accelerator Research Organization (KEK);

    Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan;

    Department of Physics, Sophia University, Chiyoda-ku, Tokyo 102-8554, Japan;

    Department of Physics, Sophia University, Chiyoda-ku, Tokyo 102-8554, Japan;

    Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Time-resolved measurements; Soft X-ray photoelectron spectroscopy; Carrier dynamics; Fullerene; Rutile TiO_2; Dye sensitized solar cell;

    机译：时间分辨的测量;软X射线光电子能谱;载波动态;富勒烯;金红石型TiO_2;染料敏化太阳能电池;

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