Small-Molecule Thiophene-C60 Dyads As Compatibilizers in Inverted Polymer Solar Cells
Small-Molecule Thiophene-C60 Dyads As Compatibilizers in Inverted Polymer Solar Cells
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DOI：
10.1021/cm102126a
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发表时间：
2010-10-26
影响因子：
8.6
通讯作者：
Loo, Yueh-Lin
中科院分区：
文献类型：
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作者：
Kim, Jong Bok;Allen, Kathryn;Loo, Yueh-Lin
本研究详细介绍了噻吩-C-60 衍生物 nT-C-60 的合成和表征，该衍生物作为包含聚（3-己基噻吩）、P3HT 和 [6,6]-苯基-C-61-丁酸甲酯（PCBM）的倒置本体异质结有机太阳能电池的相容剂。我们发现这些增容剂降低界面能并防止活性层中域粗化和宏观相分离的程度很大程度上取决于它们的分子结构。 4T-C-60是测试的衍生物中最有效的；它以 5 wt% 的量加入到 P3HT 和 PCBM 中，即使在有源层长时间热退火时也能有效抑制宏观相分离。与 4T-C-60 形成鲜明对比的是，8T-C-60 可与 P3HT 混溶。因此，在倒置太阳能电池的活性层中添加 8T-C-60 不会阻止延长退火过程中的宏观相分离。 2T-C-60 作为增容剂也是无效的，可能是因为它的噻吩链段太短，因此它存在于 P3HT 和 PCBM 之间的界面上不会增加界面粘附力。
This study details the synthesis and characterization of thiophene-C-60 derivatives, nT-C-60, as compatibilizers for inverted bulk-heterojunction organic solar cells comprising poly(3-hexylthiophene), P3HT, and [6,6]-phenyl-C-61-butyric acid methyl ester, PCBM. We find that the extent with which these compatibilizers can reduce interfacial energy and prevent domain coarsening and macrophase separation in active layers depends strongly on their molecular architecture. 4T-C-60 is the most effective among the derivatives tested; its incorporation at 5 wt % to P3HT and PCBM effectively suppresses macrophase separation, even upon extended thermal annealing of the active layers. In sharp contrast to 4T-C-60, 8T-C-60 is miscible with P3HT. The addition of 8T-C-60 to active layers of inverted solar cells therefore does not arrest macrophase separation on extended annealing. 2T-C-60 is also ineffective as a compatibilizing agent, presumably because its thiophene segment is too short so its presence at the interface between P3HT and PCBM does not increase interfacial adhesion.