• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Advanced energy materials >Charge Transfer Processes in OPV Materials as Revealed by EPR Spectroscopy
【24h】

Charge Transfer Processes in OPV Materials as Revealed by EPR Spectroscopy

机译：EPR光谱显示OPV材料中的电荷转移过程

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

Understanding charge separation and charge transport at a molecular level is crucial for improving the efficiency of organic photovoltaic (OPV) cells. Under illumination of Bulk Heterojunction (BHJ) blends of polymers and fullerenes, various paramagnetic species are formed including polymer and fullerene radicals, radical pairs, and photoexcited triplet states. Light-induced Electron Paramagnetic Resonance (EPR) spectroscopy is ideally suited to study these states in BHJ due to its selectivity in probing the paramagnetic intermediates. Advanced techniques like pulsed EPR and ENDOR spectroscopy allow the determination of hyperfine coupling tensors, while high-frequency EPR allows the EPR signals of the individual species to be resolved and their g-tensors to be determined. The magnetic resonance parameters of the various polymer donors reveal details about the delocalization of the positive polaron which is important for the efficient charge separation in BHJ systems. Time-resolved EPR can contribute to the study of the dynamics of charge separation, charge transfer and recombination in BHJ by probing the unique spectral signatures of charge transfer and triplet states. EPR also has the potential to allow characterization of intermediates and products of BHJ degradation.
机译：在分子水平上了解电荷分离和电荷传输对于提高有机光伏（OPV）电池的效率至关重要。在聚合物和富勒烯的本体异质结（BHJ）混合物的光照下，形成了多种顺磁性物质，包括聚合物和富勒烯自由基，自由基对和光激发三重态。光感应电子顺磁共振（EPR）光谱非常适合研究BHJ中的这些状态，因为它在探测顺磁性中间体方面具有选择性。脉冲EPR和ENDOR光谱等先进技术可以确定超精细耦合张量，而高频EPR可以分辨单个物种的EPR信号并确定其g张量。各种聚合物供体的磁共振参数揭示了有关正极化子离域的细节，这对于BHJ系统中有效的电荷分离非常重要。时间分辨的EPR通过探测电荷转移和三重态的独特光谱特征，可以帮助研究BHJ中的电荷分离，电荷转移和重组动力学。 EPR也有潜力表征BHJ降解的中间体和产物。

著录项

  • 来源
    《Advanced energy materials》 |2017年第10期|1602226.1-1602226.28|共28页
  • 作者

    Niklas Jens; Poluektov Oleg G.;

  • 作者单位

    Argonne Natl Lab, Chem Sci & Engn Div, 9700 S Cass Ave, Argonne, IL 60439 USA;

    Argonne Natl Lab, Chem Sci & Engn Div, 9700 S Cass Ave, Argonne, IL 60439 USA;

  • 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