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Correlation of Absorption Profile and Fill Factor in Organic Solar Cells: The Role of Mobility Imbalance

机译：有机太阳能电池吸收曲线和填充因子的相关性：流动性不平衡的作用

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摘要

We investigate the role of the spatial absorption profile within bulk hetero-junction small molecule solar cells comprising a 50 nm ZnPc:C_(60) active layer. Exploiting interference effects the absorption profile is varied by both the illumination wavelength and the thickness of an optical spacer layer adjacent to the reflecting electrode. The fill factor under 1 sun illumination is observed to change from 43 to 49% depending on the absorption profile which approximately equals the charge-carrier generation profile. It is shown by varying the mixing ratio between ZnPc and C_(60) that the importance of the generation profile is correlated with the imbalance of mobilities. Therefore, it is concluded that non-geminate recombination is the dominating loss mechanism in these devices. Numerical drift-diffusion simulations reproduce the experimental observations showing that charge carrier extraction is more efficient if charge carriers are generated close to the contact collecting the less mobile charge carrier type. Furthermore, this effect can explain the dependence of the internal quantum efficiency measured at short circuit on wavelength and implies that the spectral mismatch for a given solar simulator and device depends on the applied voltage.
机译：我们调查空间吸收轮廓在包含50 nm ZnPc：C_（60）活性层的本体异质结小分子太阳能电池中的作用。利用干涉效应，吸收分布随照射波长和与反射电极相邻的光学间隔层的厚度而变化。观察到在1个阳光照射下的填充系数从43％变为49％，具体取决于吸收曲线，该曲线大致等于电荷载流子生成曲线。通过改变ZnPc和C_（60）之间的混合比例可以看出，生成曲线的重要性与迁移率的不平衡相关。因此，可以得出结论，非gege重组是这些设备中的主要损失机制。数值漂移-扩散模拟重现了实验观察结果，结果表明，如果电荷载流子的产生接近于接触而收集的移动性较小的电荷载流子类型，则电荷载流子的提取效率更高。此外，这种效应可以解释在短路处测得的内部量子效率对波长的依赖性，并暗示给定太阳能模拟器和设备的光谱失配取决于所施加的电压。

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  • 来源
    《Advanced energy materials》 |2013年第5期|631-638|共8页
  • 作者

    Wolfgang Tress; Andre Merten; Mauro Furno; Moritz Hein; Karl Leo; Moritz Riede;

  • 作者单位

    Institut fuer Angewandte Photophysik Technische Universitaet Dresden George-Baehr-Str. 1, 01069 Dresden, Germany,Biomolecular and Organic Electronics, IFM, Linkoeping University, 58183 Linkoeping, Sweden;

    Institut fuer Angewandte Photophysik Technische Universitaet Dresden George-Baehr-Str. 1, 01069 Dresden, Germany,Fraunhofer-lnstitut fuer Photonische Mikrosysteme IPMS, Maria-Reiche-Str. 2, 01109 Dresden, Germany;

    Institut fuer Angewandte Photophysik Technische Universitaet Dresden George-Baehr-Str. 1, 01069 Dresden, Germany,Novaled AG, Tatzberg 49, 01307 Dresden, Germany;

    Institut fuer Angewandte Photophysik Technische Universitaet Dresden George-Baehr-Str. 1, 01069 Dresden, Germany;

    Institut fuer Angewandte Photophysik Technische Universitaet Dresden George-Baehr-Str. 1, 01069 Dresden, Germany;

    Institut fuer Angewandte Photophysik Technische Universitaet Dresden George-Baehr-Str. 1, 01069 Dresden, Germany;

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