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Mechanism for Efficient Photoinduced Charge Separation at Disordered Organic Heterointerfaces

机译：在无序的有机异质界面上有效的光诱导电荷分离的机制。

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Despite the poor screening of the Coulomb potential in organic semiconductors, excitons can dissociate efficiently into free charges at a donor-acceptor heterojunction, leading to application in organic solar cells. A kinetic Monte Carlo model that explains this high efficiency as a two-step process is presented. Driven by the band offset between donor and acceptor, one of the carriers first hops across the interface, forming a charge transfer (CT) complex. Since the electron and hole forming the CT complex have typically not relaxed within the disorder-broadened density of states (DOS), their remaining binding energy can be overcome by further relaxation in the DOS. The model only contains parameters that are determined from independent measurements and predicts dissociation yields in excess of 90% for a prototypical heterojunction. Field, temperature, and band offset dependencies are investigated and found to be in agreement with earlier experiments. Whereas the investigated heterojunctions have substantial energy losses associated with the dissociation process, these results suggest that it is possible to reach high dissociation yields at low energy loss.
机译：尽管对有机半导体中库仑电势的筛选不佳，但激子可以在施主-受主异质结处有效解离为自由电荷，从而应用于有机太阳能电池。提出了一个动力学的​​蒙特卡洛模型，该模型通过两步过程说明了这种高效率。在施主和受主之间的频带偏移的驱动下，一个载流子首先跃过该界面，从而形成电荷转移（CT）复合体。由于形成CT络合物的电子和空穴通常在无序扩展态密度（DOS）中没有松弛，因此可以通过在DOS中进一步松弛来克服它们的剩余结合能。该模型仅包含由独立测量确定的参数，并预测原型异质结的解离产率超过90％。对场，温度和带偏移的依赖性进行了研究，发现与早期实验一致。尽管所研究的异质结具有与解离过程相关的大量能量损失，但这些结果表明，可以在低能量损失下实现高解离产率。

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  • 来源
    《Advanced Functional Materials》 |2012年第13期|p.2700-2708|共9页
  • 作者

    Harm van Eersel; Rene A. J. Janssen; Martijn Kemerink;

  • 作者单位

    Eindhoven University of Technology Department of Applied Physics P.O. Box 513, NL-5600MB Eindhoven, The Netherlands;

    Eindhoven University of Technology Department of Applied Physics P.O. Box 513, NL-5600MB Eindhoven, The Netherlands;

    Eindhoven University of Technology Department of Applied Physics P.O. Box 513, NL-5600MB Eindhoven, The Netherlands;

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