標題: Molecular-weight-dependent nanoscale morphology in silole-containing cyclopentadithiophene polymer and fullerene derivative blends
作者: Huang, Jen-Hsien
Chen, Fang-Chung
Chen, Cheng-Lun
Huang, Annie Tzuyu
Hsiao, Yu-Sheng
Teng, Chin-Min
Yen, Feng-Wen
Chen, Pelin
Chu, Chih-Wei
光電工程學系
Department of Photonics
關鍵字: Solar cells;Bulk heterojunction;Molecular weight;Morphology Phase separation;Exciton lifetime
公開日期: 1-十一月-2011
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-ethyl-hexyl)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 C(61) 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 inter-penetrating network for carrier transport. The X-ray diffraction investigation indicated that increased pi-pi 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%. (C) 2011 Elsevier B.V. All rights reserved.
URI: http://dx.doi.org/10.1016/j.orgel.2011.06.017
http://hdl.handle.net/11536/14713
ISSN: 1566-1199
DOI: 10.1016/j.orgel.2011.06.017
期刊: ORGANIC ELECTRONICS
Volume: 12
Issue: 11
起始頁: 1755
結束頁: 1762
顯示於類別:期刊論文


文件中的檔案:

  1. 000295830700001.pdf