Lowered work function by solution processable bilayer cathode buffers in inverted organic photovoltaic and parameters of the equivalent circuit

Yoshinori Kimoto, Kenichi Matsuoka, Katsuhiko Fujita

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

In this paper, we report solution processable cathode buffers composed polyethyleneimine (PEI) and C60 fullerene or PCBM for OPV. A PEI layer was formed on an ITO surface by dip coating, followed by the immobilization of C60 or PCBM on ITO/PEI surface by the chemical reaction between an aliphatic amine and fullerene. They were used for cathode buffers in OPVs and the device performance was improved compared with the device without the buffer. The improvement can be attributed to the lowered work function (WF) by the dipole formed by PEI and ITO. The parameters in the equivalent circuit with a single diode tells us that the buffers act as electric bilayer lowering the effective voltage on the diode.

Original languageEnglish
Pages (from-to)256-262
Number of pages7
JournalMolecular Crystals and Liquid Crystals
Volume654
Issue number1
DOIs
Publication statusPublished - Sep 2 2017

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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