Phenyl vs Alkyl Polythiophene: A Solar Cell Comparison Using a Vinazene Derivative as Acceptor
Phenyl vs Alkyl Polythiophene: A Solar Cell Comparison Using a Vinazene Derivative as Acceptor
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DOI：
10.1021/cm903067a
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发表时间：
2010-01
影响因子：
8.6
通讯作者：
C. H. Woo;Thomas W. Holcombe;D. Unruh;A. Sellinger;J. Fréchet
中科院分区：
文献类型：
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作者：
C. H. Woo;Thomas W. Holcombe;D. Unruh;A. Sellinger;J. Fréchet
在以4，7-bis(2-(1-(2-ethylhexyl)-4，5-dicyanoimidazol-2-yl)vinyl)benzo[c][1，2，5]-thiadiazole(EV-BT)为电子受体的器件中，比较了聚[3-(4-正辛基)苯基噻吩基](POPT)和聚(3-己基噻吩基)(P3HT)的太阳电池性能。尽管光吸收降低，POPT：EV-BT器件在双层和体异质结(BHJ)结构中都比类似的P3HT：EV-BT器件产生更高的光电流。优化后的POPT：EV-BT BHJ器件的平均效率达到1.4%，而类似的P3HT器件仅达到1.1%。由于原子力显微镜对有源层的研究表明，这两个系统的相分离水平相当，所以形态并不能解释性能上的巨大差异。反向偏置分析表明，P3HT器件比POPT器件具有更高的最大电势，但在标准工作条件下，P3HT器件似乎更严重地受到复合损耗的限制。POPT器件性能优越的一个可能解释是……
The solar cell performance of poly[3-(4-n-octyl)-phenylthiophene] (POPT) and poly(3-hexylthiophene) (P3HT) are compared in devices using 4,7-bis(2-(1-(2-ethylhexyl)-4,5-dicyanoimidazol-2-yl)vinyl)benzo[c][1,2,5]-thiadiazole (EV-BT) as the electron acceptor. Despite their reduced light absorption, POPT:EV-BT devices generate higher photocurrents in both bilayer and bulk heterojunction (BHJ) architectures than analogous P3HT:EV-BT devices. Optimized POPT:EV-BT BHJ devices achieve 1.4% average efficiency, whereas the analogous P3HT devices only reach 1.1%. Morphology does not account for the large difference in performance as AFM studies of the active layer suggest comparable levels of phase separation in the two systems. Reverse bias analysis demonstrates that P3HT devices have a higher maximum potential than POPT devices, but P3HT devices appear to be more severely limited by recombination losses under standard operating conditions. A possible explanation for the superior performance in POPT devices is tha...