Long-range exciton dissociation in organic solar cells
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 0027-8424Full text not available from this repository.
Official URL: http://dx.doi.org/10.1073/pnas.1206172109
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|
|Page Range:||pp. 13498-13502|
|Access rights to Published version:||Restricted or Subscription Access|
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