Fluorene conjugated polymer/nickel oxide nanocomposite hole transport layer enhances the efficiency of organic photovoltaic devices

Guan Chiun Chiou, Ming Wei Lin, Yu Ling Lai, Chiao Kai Chang, Jian Ming Jiang, Yu Wei Su, Kung-Hwa Wei, Yao Jane Hsu*

*Corresponding author for this work

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

A nanocomposite layer comprising the conjugated polymer poly[(9,9-bis(3′-(N,N-dimethylamino)propyl)-2,7-fluorene)-alt-2,7-(9,9-dioctyl)fluorene] (PFN) and nickel oxide (NiO x) has been employed as the hole transport layer (HTL) in organic photovoltaics (OPVs) featuring PBDTTBO-C8 and [6,6]-phenyl-C71-butyric acid methyl ester (PC71BM) as the active layer. The optimal device incorporating the PFN:NiOxnanocomposite as the HTLs displayed a power conversion efficiency (PCE) to 6.2%, up from 4.5% for the corresponding device incorporating pristine NiOxas the HTL layer: A nearly 40% improvement in PCE. X-ray photoelectron spectroscopy (XPS) was used to determine the types of chemical bonding, ultraviolet photoelectron spectroscopy (UPS) to measure the change in work function, and atomic force microscopy (AFM) to examine the morphology of the composite layers. The growth of nickel trioxide, Ni2O3, in the PFN:NiOxlayer played a key role in producing the p-doping effect and in tuning the work function, thereby improving the overall device performance.

Original languageEnglish
Pages (from-to)2232-2239
Number of pages8
JournalACS Applied Materials and Interfaces
Volume9
Issue number3
DOIs
StatePublished - 25 Jan 2017

Keywords

  • 7-(9
  • 7-fluorene)-Alt-2
  • 9-dioctyl)fluorene] (PFN)
  • Charge transfer
  • Hole transport layer (HTL)
  • N-dimethylamino)propyl)-2
  • Nanocomposite
  • Nickel oxide (NiO)
  • Nickel trioxide (NiO)
  • Organic photovoltaics (OPVs)
  • Poly[(9,9-bis(3′-(N
  • X-ray photoelectron spectroscopy (XPS)

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