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Dispersion-Dominated Photocurrent in Polymer:Fullerene Solar Cells

机译：聚合物：富勒烯太阳能电池中色散主导的光电流

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Organic bulk heterojunction solar ceils are often regarded as near-equilibrium devices, whose kinetics are set by well-defined charge carrier mobilities, and relaxation in the density of states is commonly ignored or included purely phenomenologically. Here, the motion of photocreated charges is studied experimentally with picosecond time resolution by a combination of time-resolved optical probing of electric field and photocurrent measurements, and the data are used to define parameters for kinetic Monte Carlo modelling. The results show that charge carrier motion in a prototypical polymer:fullerene solar cell under operational conditions is orders of magnitude faster than would be expected on the basis of corresponding near-equilibrium mobilities, and is extremely dispersive. There is no unique mobility. The distribution of extraction times of photocreated charges in operating organic solar cells can be experimentally determined from the charge collection transients measured under pulsed excitation. Finally, a remarkable distribution of the photocurrent over energy is found, in which the most relaxed charge carriers in fact counteract the net photocurrent.
机译：有机体异质结太阳能电池通常被认为是接近平衡的器件，其动力学由明确定义的载流子迁移率决定，并且状态密度的松弛通常在现象学上被忽略或纯粹包括在内。在这里，通过时间分辨的电场光学探测和光电流测量，以皮秒时间分辨率对光生电荷的运动进行了实验研究，并将数据用于定义动力学蒙特卡洛建模的参数。结果表明，在操作条件下，原型聚合物：富勒烯太阳能电池中的电荷载流子运动比基于相应的近平衡迁移率所预期的快几个数量级，并且具有极高的分散性。没有独特的机动性。可以根据在脉冲激发下测得的电荷收集瞬变，通过实验确定在工作的有机太阳能电池中光生电荷提取时间的分布。最后，发现光电流在能量上的显着分布，其中最松弛的电荷载流子实际上抵消了净光电流。

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  • 来源
    《Advanced Functional Materials》 |2014年第28期|4507-4514|共8页
  • 作者

    Armantas Melianas; Vytenis Pranculis; Andrius Devizis; Vidmantas Gulbinas; Olle Inganaes; Martijn Kemerink;

  • 作者单位

    Department of Physics Chemistry and Biology Biomolecular and Organic Electronics Center of Organic Electronics (COE) Linkoeping University 58183, Linkoeping, Sweden;

    Center for Physical Sciences and Technology, Savanoriu 231 LT-02300 Vilnius, Lithuania;

    Center for Physical Sciences and Technology, Savanoriu 231 LT-02300 Vilnius, Lithuania;

    Center for Physical Sciences and Technology, Savanoriu 231 LT-02300 Vilnius, Lithuania;

    Department of Physics Chemistry and Biology Biomolecular and Organic Electronics Center of Organic Electronics (COE) Linkoeping University 58183, Linkoeping, Sweden;

    Department of Applied Physics Eindhoven University of Technology PO Box 513, 5600 MB Eindhoven, The Netherlands,Department of Physics Chemistry and Biology Linkoeping University 58183, Linkoeping, Sweden;

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