Title
Enhanced dissociation of charge-transfer states in narrow band gap polymer:fullerene solar cells processed with 1,8-octanedithiol
Author
Moet, D.J.D.
Lenes, M.
Morana, M.
Azimi, H.
Brabec, C.J.
Blom, P.W.M.
TNO Industrie en Techniek
Publication year
2010
Abstract
The improved photovoltaic performance of narrow band gap polymer:fullerene solar cells processed from solutions containing small amounts of 1,8-octanedithiol is analyzed by modeling of the experimental photocurrent. In contrast to devices that are spin coated from pristine chlorobenzene, these cells do not produce a recombination-limited photocurrent. Modeling of the experimental data reveals that a sixfold reduction in the decay rate of photogenerated bound electron-hole pairs can account for the marked increase in short-circuit current density and fill factor. At short-circuit conditions, the dissociation probability of bound pairs is found to increase from 48% to 70%.
Subject
Physics
Bound electrons
Charge transfer state
Decay rate
Dissociation probability
Experimental data
Fill factor
Narrow band gap polymers
Octanedithiol
Photovoltaic performance
Short-circuit conditions
Charge transfer
Decay (organic)
Dissociation
Energy gap
Fullerenes
Solar cells
Switching circuits
Solar power generation
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TNO identifier
461585
ISSN
0003-6951
Source
Applied Physics Letters, 96 (21)
Article number
No.: 213506
Document type
article