Origin of size effect on efficiency of organic photovoltaics

Assaf Manor; Eugene A. Katz; Thomas Tromholt; Baruch Hirsch; Frederik C. Krebs

doi:10.1063/1.3567930

Origin of size effect on efficiency of organic photovoltaics

Assaf Manor, Eugene A. Katz, Thomas Tromholt, Baruch Hirsch, Frederik C. Krebs

Research output: Contribution to journal › Article › peer-review

61 Scopus citations

Abstract

It is widely accepted that efficiency of organic solar cells could be limited by their size. However, the published data on this effect are very limited and none of them includes analysis of light intensity dependence of the key cell parameters. We report such analysis for bulk heterojunction solar cells of various sizes and suggest that the origin of both the size and the light intensity effects should include underlying physical mechanisms other than conventional series resistance dissipation. In particular, we conclude that the distributed nature of the ITO resistance and its influence on the voltage dependence of photocurrent and dark current is the key to understanding size limitation of the organic photovoltaics (OPV) efficiency. Practical methods to overcome this limitation as well as the possibility of producing concentrator OPV cells operating under sunlight concentrations higher than 10 suns are discussed.

Original language	English
Article number	074508
Journal	Journal of Applied Physics
Volume	109
Issue number	7
DOIs	https://doi.org/10.1063/1.3567930
State	Published - 1 Apr 2011
Externally published	Yes

Bibliographical note

Funding Information:
This work was performed, in part, in the framework of the “Largecells” project that received funding from the European Commission’s Seventh Framework Programme (FP7/2007-2013) under Grant Agreement No. 261936.” T.T. and F.C.K. thank the Danish Strategic Research Council (2104-07-0022) and EUDP (j. nr. 64009-0050) for financial support. E.A.K. acknowledges financial support by the FIRST - Focal Initiatives in Science and Technology foundation of the Israel Science Foundation (grant no. 1004/07).

Funding

This work was performed, in part, in the framework of the “Largecells” project that received funding from the European Commission’s Seventh Framework Programme (FP7/2007-2013) under Grant Agreement No. 261936.” T.T. and F.C.K. thank the Danish Strategic Research Council (2104-07-0022) and EUDP (j. nr. 64009-0050) for financial support. E.A.K. acknowledges financial support by the FIRST - Focal Initiatives in Science and Technology foundation of the Israel Science Foundation (grant no. 1004/07).

Funders	Funder number
EUDP	64009-0050
Foundation for Ichthyosis and Related Skin Types
Strategiske Forskningsråd	2104-07-0022
Seventh Framework Programme	261936
Israel Science Foundation	1004/07
Seventh Framework Programme

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title = "Origin of size effect on efficiency of organic photovoltaics",

abstract = "It is widely accepted that efficiency of organic solar cells could be limited by their size. However, the published data on this effect are very limited and none of them includes analysis of light intensity dependence of the key cell parameters. We report such analysis for bulk heterojunction solar cells of various sizes and suggest that the origin of both the size and the light intensity effects should include underlying physical mechanisms other than conventional series resistance dissipation. In particular, we conclude that the distributed nature of the ITO resistance and its influence on the voltage dependence of photocurrent and dark current is the key to understanding size limitation of the organic photovoltaics (OPV) efficiency. Practical methods to overcome this limitation as well as the possibility of producing concentrator OPV cells operating under sunlight concentrations higher than 10 suns are discussed.",

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note = "Funding Information: This work was performed, in part, in the framework of the “Largecells” project that received funding from the European Commission{\textquoteright}s Seventh Framework Programme (FP7/2007-2013) under Grant Agreement No. 261936.” T.T. and F.C.K. thank the Danish Strategic Research Council (2104-07-0022) and EUDP (j. nr. 64009-0050) for financial support. E.A.K. acknowledges financial support by the FIRST - Focal Initiatives in Science and Technology foundation of the Israel Science Foundation (grant no. 1004/07).",

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AU - Tromholt, Thomas

AU - Hirsch, Baruch

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N1 - Funding Information: This work was performed, in part, in the framework of the “Largecells” project that received funding from the European Commission’s Seventh Framework Programme (FP7/2007-2013) under Grant Agreement No. 261936.” T.T. and F.C.K. thank the Danish Strategic Research Council (2104-07-0022) and EUDP (j. nr. 64009-0050) for financial support. E.A.K. acknowledges financial support by the FIRST - Focal Initiatives in Science and Technology foundation of the Israel Science Foundation (grant no. 1004/07).

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AB - It is widely accepted that efficiency of organic solar cells could be limited by their size. However, the published data on this effect are very limited and none of them includes analysis of light intensity dependence of the key cell parameters. We report such analysis for bulk heterojunction solar cells of various sizes and suggest that the origin of both the size and the light intensity effects should include underlying physical mechanisms other than conventional series resistance dissipation. In particular, we conclude that the distributed nature of the ITO resistance and its influence on the voltage dependence of photocurrent and dark current is the key to understanding size limitation of the organic photovoltaics (OPV) efficiency. Practical methods to overcome this limitation as well as the possibility of producing concentrator OPV cells operating under sunlight concentrations higher than 10 suns are discussed.

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Origin of size effect on efficiency of organic photovoltaics

Abstract

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