Origin of the open-circuit voltage in multilayer heterojunction organic solar cells

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From temperature dependent studies of pentacene/C(60) solar cells in the dark, the reverse saturation current is found to be thermally activated with a barrier height that corresponds to the difference in energy between the highest occupied molecular orbital of the donor and the lowest unoccupied molecular orbital of the acceptor corrected for vacuum level misalignments and the presence of charge-transfer states. From the reverse saturation current in the dark and the short-circuit current under illumination, the open-circuit voltage can be predicted. Examination of several donor materials supports the relationship between reverse saturation current, this barrier height, and open-circuit voltage.
Publisher
AMER INST PHYSICS
Issue Date
2008-11
Language
English
Article Type
Article
Keywords

PHOTOVOLTAIC DEVICES; PERFORMANCE; PENTACENE

Citation

APPLIED PHYSICS LETTERS, v.93, no.19

ISSN
0003-6951
DOI
10.1063/1.3027061
URI
http://hdl.handle.net/10203/91450
Appears in Collection
EE-Journal Papers(저널논문)
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