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Effect of simultaneous excitation of singlet and triplet excitons on the operation of organic solar cells

Narayan, Monishka Rita and Singh, Jai (2013). Effect of simultaneous excitation of singlet and triplet excitons on the operation of organic solar cells. Journal of Applied Physics,114(15):154515-1-154515-7.

Document type: Journal Article

IRMA ID 82057923xPUB605
Title Effect of simultaneous excitation of singlet and triplet excitons on the operation of organic solar cells
Author Narayan, Monishka Rita
Singh, Jai
Journal Name Journal of Applied Physics
Publication Date 2013
Volume Number 114
Issue Number 15
ISSN 0021-8979   (check CDU catalogue open catalogue search in new window)
Scopus ID 2-s2.0-84886542153
Start Page 154515-1
End Page 154515-7
Total Pages 7
Place of Publication United States of America
Publisher American Institute of Physics
HERDC Category C1 - Journal Article (DIISR)
Abstract Primary steps of exciton formation in organic solar cells are presented here. The rates of absorption of photons to excite singlet and triplet excitons are derived using exciton-photon and exciton-spin-orbit-photon-interaction, respectively, as perturbation operators. In both singlet and triplet absorptions, the rates are found to depend on the absorption energy, excitonic Bohr radius, and the dielectric constant of the donor organic material. Incorporation of heavy metal atoms enhances the exciton-spin-orbit-photon interaction and hence the rate of excitation of triplet excitons because it depends on the square of the heaviest atomic number. The new exciton-spin-orbit-photon interaction operator flips the spin to a singlet form leading to faster dissociation into charge carriers and resulting in higher photon to electron-hole pair conversion efficiency in organic solar cells.

DOI http://dx.doi.org/10.1063/1.4826199   (check subscription with CDU E-Gateway service for CDU Staff and Students  check subscription with CDU E-Gateway in new window)
 
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