Importance of disordered polymer segments to microstructure-dependent photovoltaic properties of polymer-fullerene bulk heterojunction solar cells

Fu Chiao Wu, Ying Chou Huang, Horng Long Cheng, Wei Yang Chou, Fu Ching Tang

研究成果: Article同行評審

28 引文 斯高帕斯(Scopus)

摘要

While regulation of the nanoscale microstructure of the active layers in organic bulk heterojunction (BHJ) solar cells, particularly for conjugated polymer-fullerene blend systems, has been shown to be highly important when maximizing power conversion efficiency, little is known about the role of disordered polymer chains in the photovoltaic (PV) behaviors and electrochemical potential drops of polymer-fullerene interfaces. In this study, the microstructural-dependent PV properties of a series of poly(3-hexylthiophene) (P3HT):fullerene (i.e., [6,6]-phenyl-C61-butyric acid methyl ester, or PCBM) blending films with different compositions have been investigated using several experiments (i.e., absorption spectroscopy, Raman spectroscopy, X-ray diffraction, and atomic force microscopy) and theoretical methods (i.e., spectroscopic simulation and quantum mechanical calculations). A strong correlation exists between amorphous P3HT chain properties, characterized by degree of conjugation (Leff), and PV parameters. The impact of L eff of amorphous P3HT on exciton dissociation is addressed, thus providing an ideal structural model for organic BHJ solar cells. Although bigger P3HT and PCBM domains favor carrier transport, the control of disordered P3HT segments and PCBM contact is crucial to exciton dissociation, which can consequently optimize PV performance.

原文English
頁(從 - 到)15057-15066
頁數10
期刊Journal of Physical Chemistry C
115
發行號30
DOIs
出版狀態Published - 2011 8月 4

All Science Journal Classification (ASJC) codes

  • 電子、光磁材料
  • 一般能源
  • 物理與理論化學
  • 表面、塗料和薄膜

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