Molecular-weight-dependent nanoscale morphology in silole-containing cyclopentadithiophene polymer and fullerene derivative blends

Jen Hsien Huang, Fang-Chung Chen, Cheng Lun Chen, Annie Tzuyu Huang, Yu Sheng Hsiao, Chin Min Teng, Feng Wen Yen, Pelin Chen, Chih Wei Chu*

*Corresponding author for this work

研究成果: Article同行評審

21 引文 斯高帕斯(Scopus)

摘要

We have investigated the effect of polymer molecular weight (MW) on the morphology and efficiency of bulk heterojunction (BHJ) solar cells comprised of poly[(4,4′-bis(2-ethylhexyl)dithieno[3,2-b:2′,3′-d]silole)-2, 6-diyl-alt-(5,5′-thienyl-4,4′-dihexyl-2,2′-bithiazole)-2, 6-diyl] (Si-PCPDTTBT) and [6,6]-phenyl C61 butyric acid methyl ester (PCBM). Striking morphological changes are observed in BHJ films upon the change of the polymer MW. Atomic force microscopy and transmission electron microscopy studies suggest that high MW polymer generated high degree of phase separation, leading to formation of an interpenetrating network for carrier transport. The X-ray diffraction investigation indicated that increased π-π stacking in Si-PCPDTTBT with increasing polymer MWs results in an increase in hole mobility of Si-PCPDTTBT and electron mobility of PCBM as well as the red shift absorption spectrum in BHJ films. The solar cells based on PCBM with high-MW Si-PCPDTTBT deliver power conversion efficiencies of 3.33%.

原文English
頁(從 - 到)1755-1762
頁數8
期刊Organic Electronics
12
發行號11
DOIs
出版狀態Published - 1 一月 2011

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