• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Advanced Functional Materials >Ground State Bleaching at Donor-Acceptor Interfaces
【24h】

Ground State Bleaching at Donor-Acceptor Interfaces

机译：施主-受主界面的基态漂白

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Charge separation at the donor-acceptor interface is a key step for high efficiency in organic solar cells. If interfacial hybrid states exist already in the dark it is plausible that they can have a major impact on the dissociation of optically generated excitations. In this work we probe such interfacial states via steady state absorption spectroscopy. A substantial bleaching of the absorption spectrum is found near the absorption edge when an electron-accepting layer of either trinitrofluorenone (TNF), C_(60), or a perylene-diimide derivative is deposited on top of a layer of electron-donating conjugated polymers, such as MEH-PPV or various poly-phenylene. This is in part attributed to the formation of ground state complexes with low oscillator strength. The experiments bear out a correlation between the reduction of the absorb-ance with the energy gap between the donor-HOMO and acceptor-LUMO, the effective conjugation length of the donor, and the efficiency of exciton dissociation in the solar cell. The effect originates from mixing of the donor-HOMO and the acceptor LUMO. Calculations using density functional theory support this reasoning. Implications for efficiency of organic solar cells will be discussed.
机译：供体-受体界面处的电荷分离是提高有机太阳能电池效率的关键步骤。如果界面混合态已经在黑暗中存在，则可以认为它们会对光学产生的激发的解离产生重大影响。在这项工作中，我们通过稳态吸收光谱法研究了这种界面态。当三硝基芴酮（TNF），C_（60）或per-二酰亚胺衍生物的电子接受层沉积在给电子共轭聚合物层的顶部时，在吸收边缘附近发现吸收光谱发生了显着漂白，例如MEH-PPV或各种聚亚苯基。这部分归因于具有低振荡器强度的基态复合物的形成。实验证实了吸光度的降低与施主-HOMO和受体-LUMO之间的能隙，施主的有效共轭长度以及激子在太阳能电池中的解离效率之间的相关性。该效果源自供体-HOMO和受体LUMO的混合。使用密度泛函理论的计算支持这种推理。将讨论对有机太阳能电池效率的影响。

著录项

  • 来源
    《Advanced Functional Materials》 |2014年第41期|6439-6448|共10页
  • 作者

    Christian Schwarz; Felix Milan; Tobias Hahn; Markus Reichenberger; Stephan Kuemmel; Anna Koehler;

  • 作者单位

    Experimental Physics Ⅱ University of Bayreuth 95440, Bayreuth, Germany ,Bayreuth Institute of Macromolecular Research (BIMF) University of Bayreuth 95440, Bayreuth, Germany;

    Theoretical Physics Ⅳ University of Bayreuth 95440, Bayreuth, Germany;

    Experimental Physics Ⅱ University of Bayreuth 95440, Bayreuth, Germany ,Bayreuth Institute of Macromolecular Research (BIMF) University of Bayreuth 95440, Bayreuth, Germany;

    Experimental Physics Ⅱ University of Bayreuth 95440, Bayreuth, Germany ,Bayreuth Institute of Macromolecular Research (BIMF) University of Bayreuth 95440, Bayreuth, Germany;

    Theoretical Physics Ⅳ University of Bayreuth 95440, Bayreuth, Germany;

    Experimental Physics Ⅱ University of Bayreuth 95440, Bayreuth, Germany ,Bayreuth Institute of Macromolecular Research (BIMF) University of Bayreuth 95440, Bayreuth, Germany;

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

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号