Influence of Extraction Barrier on the Loss Process of Photogenerated Charge Carrier in Polymer Bulk Heterojunction Solar Cells
Influence of Extraction Barrier on the Loss Process of Photogenerated Charge Carrier in Polymer Bulk Heterojunction Solar Cells
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DOI：
10.1007/s40242-015-5102-6
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发表时间：
2015-09
影响因子：
3.1
通讯作者：
L. Bo;Xu Feng;Zhang Xinghua;Yan Dadong;Lu Dan
中科院分区：
文献类型：
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作者：
L. Bo;Xu Feng;Zhang Xinghua;Yan Dadong;Lu Dan
基于采用三维泡利主方程方法的全器件模型，研究了聚合物体异质结（BHJ）太阳能电池中电极与活性层之间引出通道不良导致的载流子损失过程。模拟了势垒高度对器件性能的影响，揭示了电极改进的重要性。研究发现，相对较大的引出势垒高度（超过0.40 eV）会导致整体电荷收集效率显着降低，因为电极附近的空间电荷积累效应增强，双分子复合率会增加到较高水平。相反，由于成对复合而湮灭的载流子百分比并没有随着势垒高度的变化而显着变化。我们的模拟结果可以为聚合物BHJ太阳能电池改进的更准确的模型和潜在方向提供基础。
Based on a full device model adopting three-dimensional Pauli master equation approach, the charge carrier loss process due to poor extraction channels between electrode and active layer in polymer bulk heterojunction( BHJ) solar cells was studied. The influence of barrier height on device performance was simulated to reveal the importance of electrode improvement. It was found that relatively large extraction barrier height(over 0.40 eV) can lead to the significant diminishing of the overall charge collection efficiency, since bimolecular recombination rate would increase to a high level due to enhanced space charge accumulation effect near electrodes. In contrast, the percentage of charge carrier annihilated due to geminate recombination did not change significantly with barrier height variation. Our simulation results may provide the basis for a more accurate model and potential direction of polymer BHJ solar cells improvement.