• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Physical Review X >Nonradiative Energy Losses in Bulk-Heterojunction Organic Photovoltaics
【24h】

Nonradiative Energy Losses in Bulk-Heterojunction Organic Photovoltaics

机译：散装 - 异质结有机光伏的非抗体能量损失

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The performance of solar cells based on molecular electronic materials is limited by relatively high nonradiative voltage losses. The primary pathway for nonradiative recombination in organic donor-acceptor heterojunction devices is believed to be the decay of a charge-transfer (CT) excited state to the ground state via energy transfer to vibrational modes. Recently, nonradiative voltage losses have been related to properties of the charge-transfer state such as the Franck-Condon factor describing the overlap of the CT and ground-state vibrational states and, therefore, to the energy of the CT state. However, experimental data do not always follow the trends suggested by the simple model. Here, we extend this recombination model to include other factors that influence the nonradiative decay-rate constant, and therefore the open-circuit voltage, but have not yet been explored in detail. We use the extended model to understand the observed behavior of series of small molecules:fullerene blend devices, where open-circuit voltage appears insensitive to nonradiative loss. The trend could be explained only in terms of a microstructure-dependent CT-state oscillator strength, showing that parameters other than CT-state energy can control nonradiative recombination. We present design rules for improving open-circuit voltage via the control of material parameters and propose a realistic limit to the power-conversion efficiency of organic solar cells.
机译：基于分子电子材料的太阳能电池的性能受到相对高的非相对电压损耗的限制。在有机供体 - 受体异质结装置中的非接种重组的主要途径被认为是通过能量转移到振动模式的电荷转移（CT）激发状态的衰减。最近，非接近电压损耗与电荷转移状态的性质有关，例如描述CT和地状态振动状态重叠的FRAnck-Condon因子，因此，到CT状态的能量。但是，实验数据并不总是遵循简单模型所建议的趋势。这里，我们将该重组模型扩展到包括影响非地形衰减速率常数的其他因素，因此尚未详细探索的开路电压。我们使用扩展模型来了解观察到的一系列小分子的行为：富勒烯混合装置，其中开路电压对非接壤损耗不敏感。可以仅根据微观结构依赖性CT状态振荡器强度来解释该趋势，表明除了CT状态能量之外的参数可以控制非抗体重组。我们通过控制材料参数提供改进开路电压的设计规则，并提出了有机太阳能电池的电力转换效率的实际限制。

著录项

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