TY - JOUR
T1 - Organic photovoltaics
T2 - Elucidating the ultra-fast exciton dissociation mechanism in disordered materials
AU - Heitzer, Henry M.
AU - Savoie, Brett M.
AU - Marks, Tobin J.
AU - Ratner, Mark A.
PY - 2014/7/14
Y1 - 2014/7/14
N2 - Organic photovoltaics (OPVs) offer the opportunity for cheap, lightweight and mass-producible devices. However, an incomplete understanding of the charge generation process, in particular the timescale of dynamics and role of exciton diffusion, has slowed further progress in the field. We report a new Kinetic Monte Carlo model for the exciton dissociation mechanism in OPVs that addresses the origin of ultra-fast (<1 ps) dissociation by incorporating exciton delocalization. The model reproduces experimental results, such as the diminished rapid dissociation with increasing domain size, and also lends insight into the interplay between mixed domains, domain geometry, and exciton delocalization. Additionally, the model addresses the recent dispute on the origin of ultra-fast exciton dissociation by comparing the effects of exciton delocalization and impure domains on the photo-dynamics.This model provides insight into exciton dynamics that can advance our understanding of OPV structure-function relationships.
AB - Organic photovoltaics (OPVs) offer the opportunity for cheap, lightweight and mass-producible devices. However, an incomplete understanding of the charge generation process, in particular the timescale of dynamics and role of exciton diffusion, has slowed further progress in the field. We report a new Kinetic Monte Carlo model for the exciton dissociation mechanism in OPVs that addresses the origin of ultra-fast (<1 ps) dissociation by incorporating exciton delocalization. The model reproduces experimental results, such as the diminished rapid dissociation with increasing domain size, and also lends insight into the interplay between mixed domains, domain geometry, and exciton delocalization. Additionally, the model addresses the recent dispute on the origin of ultra-fast exciton dissociation by comparing the effects of exciton delocalization and impure domains on the photo-dynamics.This model provides insight into exciton dynamics that can advance our understanding of OPV structure-function relationships.
KW - FRET
KW - donor-acceptor systems
KW - energy transfer
KW - molecular modeling
KW - organic photovoltaics
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U2 - 10.1002/anie.201402568
DO - 10.1002/anie.201402568
M3 - Article
C2 - 24829165
AN - SCOPUS:84904437450
SN - 1433-7851
VL - 53
SP - 7456
EP - 7460
JO - Angewandte Chemie - International Edition
JF - Angewandte Chemie - International Edition
IS - 29
ER -