Enhanced exciton harvesting in a planar heterojunction organic photovoltaic device by solvent vapor annealing

Yiwei Zhang, Muhammad T. Sajjad, Oskar Blaszczyk, Arvydas Ruseckas, Luis A. Serrano, Graeme Cooke, Ifor D.W. Samuel

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)
6 Downloads (Pure)

Abstract

The singlet exciton diffusion length was measured in a small molecule electron donor material DR3TBDTT using fluorescence quenching at a planar interface with a cross-linked fullerene derivative. The one-dimensional exciton diffusion length was increased from ~16 to ~24 nm by annealing the film in carbon disulfide solvent vapor. Planar heterojunction solar cells were fabricated using bilayers of these materials and it was found that solvent vapor annealing increased the short circuit current density by 46%. This can be explained by improved exciton harvesting in the annealed bilayer.
Original languageEnglish
JournalOrganic Electronics
Volume70
Early online date13 Mar 2019
DOIs
Publication statusPublished - Jul 2019

Keywords

  • Organic solar cells
  • Exciton diffusion length
  • Photoluminescence quenching
  • Bilayer

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