Effect of Multiple Adduct Fullerenes on Charge Generation and Transport in Photovoltaic Blends with Poly(3-hexylthiophene-2,5-diyl)
Effect of Multiple Adduct Fullerenes on Charge Generation and Transport in Photovoltaic Blends with Poly(3-hexylthiophene-2,5-diyl)
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DOI：
10.1002/polb.22125
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发表时间：
2011-01-01
影响因子：
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通讯作者：
Nelson, Jenny
中科院分区：
文献类型：
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作者：
Faist, Mark A.;Keivanidis, Panagiotis E.;Nelson, Jenny
研究了用聚（3-己基噻吩-2,5-二基）（P3HT）在本体异质结有机太阳能电池中用其多加合物类似物（双-PCBM和三-PCBM）替代[6,6]-苯基-C-61丁酸甲酯（PCBM）的共混膜微观结构、光物理、电子传输性能和器件性能的影响。虽然双 PCBM 混合物的功率转换效率与 PCBM 混合物相似，但由于光电流较小，三 PCBM 器件的性能要低得多。尽管富勒烯多加合物的电子亲和力较低，但μs-ms瞬态吸收测量表明，所有三种富勒烯的电荷产生效率相似。与具有 PCBM 的退火共混膜相比，具有多加合物的退火共混膜表现出较低的富勒烯聚集程度和较低的 P3HT 结晶度。我们得出的结论是，性能的降低主要是由于较高加合物的共混膜中的电子传输较差，这是由于富勒烯网络形成较差以及富勒烯相内的电子传输较慢，这一点通过场效应晶体管测量得到证实。 (C) 2010 Wiley periodicals, Inc. J Polym Sci Part B：Polym Phys 49：45-51，2011
The effect of replacing [6,6]-phenyl-C-61 butyric acid methyl ester (PCBM) by its multiadduct analogs (bis-PCBM and tris-PCBM) in bulk heterojunction organic solar cells with poly(3-hexylthiophene-2,5-diyl) (P3HT) is studied in terms of blend film microstructure, photophysics, electron transport properties, and device performance. Although the power conversion efficiency of the blend with bis-PCBM is similar to the blend with PCBM, the performance of the devices with tris-PCBM is considerably lower as a result of small photocurrent. Despite the lower electron affinity of the fullerene multiadducts, mu s-ms transient absorption measurements show that the charge generation efficiency is similar for all three fullerenes. The annealed blend films with multiadducts show a lower degree of fullerene aggregation and lower P3HT crystallinity than the annealed blend films with PCBM. We conclude that the reduction in performance is due largely to poorer electron transport in the blend films from higher adducts, due to the poorer fullerene network formation as well as the slower electron transport within the fullerene phase, confirmed here by field effect transistor measurements. (C) 2010 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 49: 45-51, 2011