Enhanced dissociation of charge-transfer states in narrow band gap polymer:fullerene solar cells processed with 1,8-octanedithiol

article





Moet, D.J.D.

Lenes, M.

Morana, M.

Azimi, H.

Brabec, C.J.

Blom, P.W.M.
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%.
Topics

















Bound electronsCharge transfer stateDecay rateDissociation probabilityExperimental dataFill factorNarrow band gap polymersOctanedithiolPhotovoltaic performanceShort-circuit conditionsCharge transferDecay (organic)DissociationEnergy gapFullerenesSolar cellsSwitching circuitsSolar power generation
TNO Identifier
461585
Repository link
https://resolver.tno.nl/uuid:011e1c0f-77b8-41e0-9c81-6cf4b155e8ec
ISSN
0003-6951
Source
Applied Physics Letters, 96(21)
Article nr.
213506
Collation
3 p.
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