Autoionization of Excitons in Organic Solar Cells

It has been shown that in addition to the conventional mechanism of photovoltaic effect in organic solar cells (OSCs), which is the ionization of molecular excitons on impurities, a new mechanism is possible in nanoscale cells, namely, tunneling autoionization in a strong electric field of the pn ju...

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Bibliographic Details
Published in:High energy chemistry 2018-09, Vol.52 (5), p.400-406
Main Authors: Benderskii, V. A., Kats, E. I.
Format: Article
Language:English
Subjects:
Autoionization
Charge transfer
Chemistry
Chemistry and Materials Science
Electric fields
Excitons
Impurities
P-n junctions
Photonics
Photovoltaic cells
Photovoltaic effect
Physical Chemistry
Solar cells
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Summary:It has been shown that in addition to the conventional mechanism of photovoltaic effect in organic solar cells (OSCs), which is the ionization of molecular excitons on impurities, a new mechanism is possible in nanoscale cells, namely, tunneling autoionization in a strong electric field of the pn junction. Its quantum yield for molecular excitons and charge-transfer excitons becomes higher than for ionization on impurities with a cell length of less than 20–25 or 60–80 lattice periods (~10 and ~25 nm), respectively. The possibility of creating cascades of series-connected OSCs with a quantum yield close to 1 on the basis of the new mechanism is discussed.
ISSN:0018-1439
1608-3148
DOI:10.1134/S0018143918050041