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 language | English |
|---|---|
| Pages (from-to) | 14840-14847 |
| Number of pages | 8 |
| Journal | Journal of Physical Chemistry C |
| Volume | 118 |
| Issue number | 27 |
| DOIs | |
| Publication status | Published - Jul 10 2014 |
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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. 14840-14847.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Critical electron transfer rates for Exciton dissociation governed by extent of crystallinity in small molecule organic Photovoltaics
AU - Spencer, Susan
AU - Cody, Jeremy
AU - Misture, Scott
AU - Cona, Brandon
AU - Heaphy, Patrick
AU - Rumbles, Gary
AU - Andersen, John
AU - Collison, Christopher
PY - 2014/7/10
Y1 - 2014/7/10
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84904366774&partnerID=8YFLogxK
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U2 - 10.1021/jp504377r
DO - 10.1021/jp504377r
M3 - Article
VL - 118
SP - 14840
EP - 14847
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
SN - 1932-7447
IS - 27
ER -