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Study of the mechanism and rate of exciton dissociation at the donor-acceptor interface in bulk-heterojunction organic solar cells

Narayan, Monishka R. and Singh, Jai (2013). Study of the mechanism and rate of exciton dissociation at the donor-acceptor interface in bulk-heterojunction organic solar cells. Journal of Applied Physics,114(7):073510-1-073510-7.

Document type: Journal Article
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IRMA ID 82057923xPUB553
Title Study of the mechanism and rate of exciton dissociation at the donor-acceptor interface in bulk-heterojunction organic solar cells
Author Narayan, Monishka R.
Singh, Jai
Journal Name Journal of Applied Physics
Publication Date 2013
Volume Number 114
Issue Number 7
ISSN 0021-8979   (check CDU catalogue  open catalogue search in new window)
Scopus ID 2-s2.0-84883265146
Start Page 073510-1
End Page 073510-7
Total Pages 7
Place of Publication United States of America
Publisher American Institute of Physics
HERDC Category C1 - Journal Article (DIISR)
Abstract In this paper, a comprehensive study is carried out on the dissociation mechanism of excitons in bulk-heterojunction organic solar cells. It is proposed that at the donor-acceptor interface, a Frenkel exciton relaxes to a charge transfer exciton and then dissociates into free charge carriers with the aid of molecular vibrational energy. The interaction operator between the charge transfer exciton and molecular vibrational energy is derived and used to formulate and calculate the rates of dissociation of singlet and triplet excitons into free charge carriers. The dissociation rates are found to be dependent on the binding energy, lowest unoccupied molecular orbital offset between the donor and acceptor, the phonon energy, reduced excitonic mass, excitonic Bohr radius, and the dielectric constant of the organic material. Using the proposed dissociation mechanism, three points have also been highlighted that could provide possible reasons as to why the performance of bulk-heterojunction organic solar cell is low.
DOI http://dx.doi.org/10.1063/1.4818813   (check subscription with CDU E-Gateway service for CDU Staff and Students  check subscription with CDU E-Gateway in new window)
Additional Notes Copyright by the American Institute of Physics


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