Critical electron transfer rates for exciton dissociation governed by extent of crystallinity in small molecule organic photovoltaics

Susan Spencer, Jeremy Cody, Scott Misture, Brandon Cona, Patrick Heaphy, Gary Rumbles, John Andersen, Christopher Collison

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Solution-processed bulk heterojunction organic solar cells fabricated with 1,3-bis[4-(N,N-diisopentylamino)-2,6-dihydroxyphenyl]squaraine and phenyl-C61-butyric acid methyl ester were found to exhibit unexpectedly low external quantum efficiency in the squaraine regions upon annealing. X-ray diffraction (XRD), spectral response, and time-resolved microwave absorption were all used to characterize the materials used and the devices prepared from them. An explanation for the drop in efficiency is proposed using Marcus-Hush theory to tie together the changes in coherent crystal domain size found by XRD and the external quantum efficiency results. Exciton dissociation at the interface was determined to be the rate-limiting step in efficient current generation for these devices.

Original languageEnglish
Pages (from-to)14848-14852
Number of pages5
JournalJournal of Physical Chemistry C
Volume118
Issue number27
DOIs
Publication statusPublished - Jul 10 2014

Fingerprint

Quantum efficiency
Excitons
quantum efficiency
crystallinity
electron transfer
excitons
dissociation
X ray diffraction
Molecules
Butyric acid
Butyric Acid
butyric acid
Electrons
microwave absorption
spectral sensitivity
diffraction
Heterojunctions
heterojunctions
esters
molecules

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films
  • Energy(all)

Cite this

Critical electron transfer rates for exciton dissociation governed by extent of crystallinity in small molecule organic photovoltaics. / Spencer, Susan; Cody, Jeremy; Misture, Scott; Cona, Brandon; Heaphy, Patrick; Rumbles, Gary; Andersen, John; Collison, Christopher.

In: Journal of Physical Chemistry C, Vol. 118, No. 27, 10.07.2014, p. 14848-14852.

Research output: Contribution to journalArticle

Spencer, Susan ; Cody, Jeremy ; Misture, Scott ; Cona, Brandon ; Heaphy, Patrick ; Rumbles, Gary ; Andersen, John ; Collison, Christopher. / Critical electron transfer rates for exciton dissociation governed by extent of crystallinity in small molecule organic photovoltaics. In: Journal of Physical Chemistry C. 2014 ; Vol. 118, No. 27. pp. 14848-14852.
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