Role of the Charge Transfer State in Organic Donor-Acceptor Solar Cells
Role of the Charge Transfer State in Organic Donor-Acceptor Solar Cells
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DOI：
10.1002/adma.201000376
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发表时间：
2010-10-01
影响因子：
29.4
通讯作者：
Dyakonov, Vladimir
中科院分区：
文献类型：
--
作者：
Deibel, Carsten;Strobel, Thomas;Dyakonov, Vladimir
电荷转移复合物是有机太阳能电池中存在于给体-受体异质界面的界面电荷对。实验证据表明，它是至关重要的光伏性能，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解离和电荷提取之间的中间但必不可少的步骤。自由电荷在丢失到基态之前，通过束缚电荷转移态转移到基态。就开路电压而言，其最大可实现值由电荷转移状态的能量确定。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复合物的动能过剩能量对电荷光生的影响。显然，对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。
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.