Role of electron-and hole-collecting buffer layers on the stability of inverted polymer: Fullerene photovoltaic devices

Eszter Voroshazi, Ilaria Cardinaletti, Griet Uytterhoeven, Shan Li, Max Empl, Tom Aernouts, Barry P. Rand

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

Systematic device performance and air stability comparison of inverted architecture polythiophene:fullerene photovoltaic cells with eight different electron-collecting layers (ECLs) and two hole-collecting layers are presented in this study. Regardless of the ECL, we achieved an efficiency of over 3.5% and lifetime of over 1000 h. These results indicate the relative interchangeability of various solution-processed ECLs. Long-term (>5000 h) air exposure revealed a secondary failure mechanism of inverted cells, which is assigned to hindered exciton harvesting. Notably, devices with a polymeric hole-collecting layer and Ag/Al electrode exhibited the longest lifetime (defined as 80% of the initial performance) of 4000 h, compared with 3000 h for MoO3/Ag/Al.

Original languageEnglish (US)
Article number6664999
Pages (from-to)265-270
Number of pages6
JournalIEEE Journal of Photovoltaics
Volume4
Issue number1
DOIs
StatePublished - Jan 2014
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Keywords

  • Degradation
  • interface phenomena
  • organic semiconductors
  • oxygen
  • solar cells

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