Skip to main content

Tuning non langevin recombination in an organic photovoltaic blend using a processing additive

Journal Article


Abstract


  • The effect of altering the acceptor and exchanging a key atom in the polymer structure on the extent of non Langevin (suppressed) recombination has been examined using the polymer/fullerene photovoltaic blend PDTSiTTz:PC60BM. Time of flight data show that changing the acceptor from PC60BM to PC70BM maintains the non Langevin recombination. In contrast, altering the donor polymer by exchanging the silicon bridging atom for a carbon considerably reduces the non Langevin behavior. Importantly, the addition of a processing additive, diiodooctane (DIO), allows a partial recovery of this non Langevin recombination. The addition of DIO also decreases the ionization potential of the polymer, which not only explains the drop in open circuit voltage but may also contribute to the partial recovery of non Langevin behavior observed. It is proposed that localized, more crystalline areas of lower ionization potential (or higher electron affinity) within a mixed/amorphous phase may act as energy sinks for the holes (electrons), thus potentially inhibiting bimolecular recombination. Such a phenomenon could contribute to non Langevin behavior in organic photovoltaic blends.

UOW Authors


  •   Clarke, Tracey M.
  •   Lungenschmied, Christoph (external author)
  •   Peet, Jeff (external author)
  •   Drolet, Nicolas (external author)
  •   Mozer, Attila

Publication Date


  • 2015

Citation


  • Clarke, T. M., Lungenschmied, C., Peet, J., Drolet, N. & Mozer, A. J. (2015). Tuning non langevin recombination in an organic photovoltaic blend using a processing additive. The Journal of Physical Chemistry C: Energy Conversion and Storage, Optical and Electronic Devices, Interfaces, Nanomaterials, and Hard Matter, 119 (13), 7016-7021.

Scopus Eid


  • 2-s2.0-84926431686

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/1398

Number Of Pages


  • 5

Start Page


  • 7016

End Page


  • 7021

Volume


  • 119

Issue


  • 13

Abstract


  • The effect of altering the acceptor and exchanging a key atom in the polymer structure on the extent of non Langevin (suppressed) recombination has been examined using the polymer/fullerene photovoltaic blend PDTSiTTz:PC60BM. Time of flight data show that changing the acceptor from PC60BM to PC70BM maintains the non Langevin recombination. In contrast, altering the donor polymer by exchanging the silicon bridging atom for a carbon considerably reduces the non Langevin behavior. Importantly, the addition of a processing additive, diiodooctane (DIO), allows a partial recovery of this non Langevin recombination. The addition of DIO also decreases the ionization potential of the polymer, which not only explains the drop in open circuit voltage but may also contribute to the partial recovery of non Langevin behavior observed. It is proposed that localized, more crystalline areas of lower ionization potential (or higher electron affinity) within a mixed/amorphous phase may act as energy sinks for the holes (electrons), thus potentially inhibiting bimolecular recombination. Such a phenomenon could contribute to non Langevin behavior in organic photovoltaic blends.

UOW Authors


  •   Clarke, Tracey M.
  •   Lungenschmied, Christoph (external author)
  •   Peet, Jeff (external author)
  •   Drolet, Nicolas (external author)
  •   Mozer, Attila

Publication Date


  • 2015

Citation


  • Clarke, T. M., Lungenschmied, C., Peet, J., Drolet, N. & Mozer, A. J. (2015). Tuning non langevin recombination in an organic photovoltaic blend using a processing additive. The Journal of Physical Chemistry C: Energy Conversion and Storage, Optical and Electronic Devices, Interfaces, Nanomaterials, and Hard Matter, 119 (13), 7016-7021.

Scopus Eid


  • 2-s2.0-84926431686

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/1398

Number Of Pages


  • 5

Start Page


  • 7016

End Page


  • 7021

Volume


  • 119

Issue


  • 13