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Influence of charge carrier mobility and morphology on solar cell parameters in devices of mono- and bis-fullerene adducts

机译：单和双富勒烯加合物中载流子迁移率和形貌对太阳能电池参数的影响

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摘要

Herein, we analyze charge carrier mobility and morphology of the active blend layer in thin film organic solar cells and correlate them with device parameters. A low band gap donor-acceptor copolymer in combination with phenyl-C61-butyric acid methyl ester (PCBM) or two bis-adduct fullerenes, bis-PCBM and bis-o-quino-dimethane C60 (bis-oQDMC), is investigated. We study the charge transport of polymer:fullerene blends in hole- and electron-only devices using the space-charge limited current method. Lower electron mobilities are observed in both bis-adduct fullerene blends. Hole mobility, however, is decreased only in the blend containing bis-oQDMC. Both bis-adduct fullerene blends show very high open circuit voltage in solar cell devices, but poor photocurrent compared to the standard PCBM blend for an active layer thickness of 200 nm. Therefore, a higher short circuit current is feasible for the polymer:bis-PCBM blend by reducing the active layer thickness in order to compensate for the low electron mobility, which results in a PCE of 4.3%. For the polymer:bis-oQDMC blend, no such improvement is achieved due to an unfavorable morphology in this particular blend system. The results are supported by external quantum efficiency measurements, atomic force microscopy, transmission electron microscopy and UV/vis spectroscopy. Based on these results, the investigations presented herein give a more scientific basis for the optimization of solar cells.
机译：本文中，我们分析了薄膜有机太阳能电池中活性共混层的电荷载流子迁移率和形态，并将它们与器件参数相关联。研究了一种低带隙供体-受体共聚物，其与苯基-C61-丁酸甲酯（PCBM）或两种双加合物富勒烯（bis-PCBM和双-邻-喹啉-二氯甲烷C60（bis-oQDMC）结合使用）。我们使用空间电荷限制电流方法研究仅空穴和仅电子的器件中聚合物：富勒烯共混物的电荷传输。在两种双加合物富勒烯共混物中均观察到较低的电子迁移率。然而，空穴迁移率仅在含有bis-oQDMC的共混物中降低。两种双加合物富勒烯共混物在太阳能电池设备中均显示出很高的开路电压，但与标准PCBM共混物相比，有源层厚度为200 nm时光电流差。因此，通过减小活性层厚度以补偿低电子迁移率，对于聚合物：bis-PCBM共混物，较高的短路电流是可行的，这导致PCE为4.3％。对于聚合物：双-oQDMC共混物，由于在这种特定共混物系统中的形态不利，因此无法实现这种改进。外部量子效率测量，原子力显微镜，透射电子显微镜和UV / vis光谱学为结果提供了支持。基于这些结果，本文介绍的研究为太阳能电池的优化提供了更科学的依据。

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