Perovskite/TiO 2 Interface Passivation Using Poly(vinylcarbazole) and Fullerene for the Photovoltaic Conversion Efficiency of 21%

Wataru Okada, Takeo Suga, Kenichi Oyaizu, Hiroshi Segawa, Hiroyuki Nishide

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Poly(vinylcarbazole) (PVCz) dispersed the typical fullerene derivative, PCBM, well in its solution, which was then coated onto a mesoporous titanium oxide (TiO 2 ) layer. PVCz served as a scaffold to fix PCBM homogeneously and to prevent its elution out upon the following perovskite layer formation. A series of perovskite cells were fabricated upon the PVCz/PCBM-modified TiO 2 layer. Many of the cells were characterized by a photovoltaic conversion efficiency of >20%, and the top cells had an efficiency of 21.1% (with an average of 21.0%). Fluorescence decay from the perovskite layer of the cell was unchanged with the PVCz/PCBM modification, suggesting an efficient charge transport to the electron-transporting layers. On the other hand, the PVCz/PCBM modification or passivation significantly reduced electroluminescence intensity under an inverse bias application, supporting an efficient suppression of carrier recombination at the TiO 2 and perovskite interface.

Original languageEnglish
Pages (from-to)2848-2853
Number of pages6
JournalACS Applied Energy Materials
Volume2
Issue number4
DOIs
Publication statusPublished - 2019 Apr 22

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Keywords

  • charge transport
  • interface passivation
  • perovskite
  • photoenergy conversion
  • poly(vinylcarbazole)
  • solar cell

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Chemical Engineering (miscellaneous)
  • Electrochemistry
  • Materials Chemistry
  • Electrical and Electronic Engineering

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