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Role of the Charge Transfer State in Organic Donor-Acceptor Solar Cells

机译：电荷转移状态在有机供体-受体太阳能电池中的作用

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摘要

Charge transfer complexes are interfacial charge pairs residing at the donor-acceptor heterointerface in organic solar cell. Experimental evidence shows that it is crucial for the photovoltaic performance, as both photocurrent and open circuit voltage directly depend on it. For charge photogeneration, charge transfer complexes represent the intermediate but essential step between exciton dissotiation and charge extraction. Recombination of free charges to the ground state is via the bound charge transfer state before being lost to the ground state. In terms of the open circuit voltage, its maximum achievable value is determined by the energy of the charge transfer state. An important question is whether or not maximum photocurrent and maximum open circuit voltage can be achieved simultaneously. The impact of increasing the CT energy-in order to raise the open circuit voltage, but lowering the kinetic excess energy of the CT complexes at the same time-on the charge photogeneration will accordingly be discussed. Clearly, the fundamental understanding of the processes involving the charge transfer state is essential for an optimisation of the performance of organic solar cells.
机译：电荷转移络合物是驻留在有机太阳能电池中供体-受体异质界面上的界面电荷对。实验证据表明，这对于光伏性能至关重要，因为光电流和开路电压都直接取决于它。对于电荷光生，电荷转移复合物代表激子离解和电荷提取之间的中间但必不可少的步骤。游离电荷通过束缚电荷转移状态重新结合成基态，然后再失去基态。就开路电压而言，其最大可达到值取决于电荷转移状态的能量。一个重要的问题是，是否可以同时实现最大光电流和最大开路电压。因此，将讨论增加CT能量（以提高开路电压，但同时降低CT络合物的动能）对电荷光生的影响。显然，对于涉及电荷转移状态的过程的基本理解对于优化有机太阳能电池的性能至关重要。

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  • 来源
    《Advanced Materials》 |2010年第37期|p.4097-4111|共15页
  • 作者

    Carsten Deibel; Thomas Strobel; Vladimir Dyakonov;

  • 作者单位

    Experimental Physics VI Julius-Maximilians-University of Wuerzburg 97074 WuErzburg (Germany);

    rnExperimental Physics VI Julius-Maximilians-University of Wuerzburg 97074 WuErzburg (Germany),Cavendish Laboratory, University of Cambridge Cambridge CB3 OHE (UK);

    rnExperimental Physics VI Julius-Maximilians-University of Wuerzburg 97074 Wurzburg (Germany) and Bavarian Centre for Applied Energy Research (ZAE Bayern) 97074 Wuerzburg (Germany);

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