Caruso, D. and Troisi, Alessandro. (2012) Long-range exciton dissociation in organic solar cells. Proceedings of the National Academy of Sciences, Vol.109 (No.34). pp. 13498-13502. ISSN 0027-8424

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Abstract

It is normally assumed that electrons and holes in organic solar cells are generated by the dissociation of excitons at the interface between donor and acceptor materials in strongly bound hole-electron pairs. We show in this contribution that excitons can dissociate tens of angstroms away from the interface and generate partially separated electrons and holes, which can more easily overcome their coulombic attraction and form free charges. We first establish under what conditions long-range exciton dissociation is likely (using a kinetic model and a microscopic model for the calculation of the long-range electron transfer rate). Then, defining a rather general model Hamiltonian for the donor material, we show that the phenomenon is extremely common in the majority of polymer:fullerene bulk heterojunction solar cells.

Item Type:	Journal Article
Subjects:	Q Science > QD Chemistry
Divisions:	Faculty of Science > Chemistry Faculty of Science > Centre for Scientific Computing
Journal or Publication Title:	Proceedings of the National Academy of Sciences
Publisher:	National Academy of Sciences
ISSN:	0027-8424
Date:	2012
Volume:	Vol.109
Number:	No.34
Page Range:	pp. 13498-13502
Identification Number:	10.1073/pnas.1206172109
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
URI:	http://wrap.warwick.ac.uk/id/eprint/50901

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