Improved electron injection in poly(9, 9′ -dioctylfluorene)- co-benzothiodiazole via cesium carbonate by means of coannealing

Research output: Contribution to journal › Research article › Contributed › peer-review

Contributors

  • Yana Vaynzof - , University of Cambridge (Author)
  • Dinesh Kabra - , University of Cambridge (Author)
  • Lay Lay Chua - , National University of Singapore (Author)
  • Richard H. Friend - , University of Cambridge, National University of Singapore (Author)

Abstract

We investigate the electron-injecting properties of a ZnO substrate modified by a thin layer of solution-processed Cs2 CO3 into poly(9, 9′ -dioctylfluorene)-co-benzothiodiazole (F8BT). Ultraviolet photoemission spectroscopy studies reveal that in the case of coannealed F8BT/ Cs2 CO3 films, the Fermi level is pinned at the lowest unoccupied molecular orbital of the F8BT, indicating significant n-doping of the polymer. X-ray photoemission spectroscopy measurements reveal the presence of Cs2 CO3 in the coannealed F8BT/ Cs2 CO 3 films. I-V measurements in single carrier devices show a significant improvement in the electron injection of the coannealed F8BT/ Cs2 CO3, in agreement with the observed n-doping of the polymer upon coannealing.

Details

Original languageEnglish
Article number113306
JournalApplied physics letters
Volume98
Issue number11
Publication statusPublished - 14 Mar 2011
Peer-reviewedYes
Externally publishedYes

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