• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Advanced Functional Materials >Activation Energy Spectra: Insights into Transport Limitations of Organic Semiconductors and Photovoltaic Cells
【24h】

Activation Energy Spectra: Insights into Transport Limitations of Organic Semiconductors and Photovoltaic Cells

机译：活化能谱：洞察有机半导体和光伏电池的传输限制

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

Some mechanisms of charge transport in organic semiconductors and organic photovoltaic (OPV) cells can be distinguished by their predicted change in activation energy for the current, E_a, versus applied field, F. E_a versus F is measured first in pure films of commercially available regioregular poly(3-hexylthiophene) (P3HT) and in the same P3HT treated to reduce its charged defect density. The former shows a Poole-Frenkel (PF)-like decrease in E_a at low F, which then plateaus at higher F. The low defect material does not exhibit PF behavior and E_a remains approximately constant. Upon addition of [6,6]-phenyl-C_(61)-butyric acid methyl ester (PCBM), however, both materials show a large increase in E_a and exhibit PF-like behavior over the entire field range. These results are explained with a previously proposed model of transport that considers both the localized random disorder in the energy levels and the long-range electrostatic fluctuations resulting from charged defects. Activation energy spectra in working OPV cells show that the current is injection-limited over most of the voltage range but becomes transport-limited, with a large peak in E_a, near the open circuit photovoltage. This causes a decrease in fill factor, which may be a general limitation in such solar cells.
机译：在有机半导体和有机光伏（OPV）电池中，某些电荷传输机制可以通过其预测的电流E_a相对于施加电场F的活化能变化来区分。E_a相对于F首先在可商购的规则正电荷纯膜中测量聚（3-己基噻吩）（P3HT）并在同一P3HT中进行处理以降低其带电缺陷密度。前者显示出在低F时E_a出现类似Poole-Frenkel（PF）的下降，然后在较高F时达到平稳。低缺陷材料不表现出PF行为，并且E_a保持近似恒定。但是，在添加[6,6]-苯基-C_（61）-丁酸甲酯（PCBM）时，两种材料的E_a均显着增加，并且在整个电场范围内均表现出类似PF的行为。用先前提出的传输模型解释了这些结果，该模型同时考虑了能级中的局部随机无序和由带电缺陷导致的远距离静电波动。工作的OPV电池中的活化能谱表明，电流在大多数电压范围内受注入限制，但变为传输受限，在开路光电压附近在E_a中有一个大峰值。这导致填充系数的降低，这可能是这种太阳能电池的一般限制。

著录项

  • 来源
    《Advanced Functional Materials》 |2012年第5期|p.1087-1091|共5页
  • 作者

    Ziqi Liang; Alexandre M. Nardes; Jao van de Lagemaat; Brian A. Gregg;

  • 作者单位

    National Renewable Energy Laboratory 1617 Cole Boulevard, Golden, CO 80401, USA;

    National Renewable Energy Laboratory 1617 Cole Boulevard, Golden, CO 80401, USA;

    National Renewable Energy Laboratory 1617 Cole Boulevard, Golden, CO 80401, USA;

    National Renewable Energy Laboratory 1617 Cole Boulevard, Golden, CO 80401, 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