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

Ben-Gurion University of the Negev

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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. (C) 2011 American Institute of Physics. [doi:10.1063/1.3567930]

Original language	English
Journal	Journal of Applied Physics
Volume	109
Issue number	7
Pages (from-to)	074508
ISSN	0021-8979
DOIs	https://doi.org/10.1063/1.3567930
Publication status	Published - 2011

Bibliographical note

Copyright (2011) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.

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).

Keywords

Polymer solar cells

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10.1063/1.3567930

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Largecells : Large-area Organic and Hybrid Solar Cells
Krebs, F. C. (Project Participant) & Søndergaard, R. R. (Project Participant)
01/09/2010 → 31/08/2014
Project: Research
Polymer Solar Cells for Solar Energy Conversion
Krebs, F. C. (Project Manager)
01/01/2008 → 31/12/2013
Project: Research

Cite this

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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. (C) 2011 American Institute of Physics. [doi:10.1063/1.3567930]",

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N1 - Copyright (2011) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. 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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N2 - 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. (C) 2011 American Institute of Physics. [doi:10.1063/1.3567930]

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. (C) 2011 American Institute of Physics. [doi:10.1063/1.3567930]

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JO - Journal of Applied Physics

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Origin of size effect on efficiency of organic photovoltaics

Abstract

Bibliographical note

Keywords

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Projects

Largecells : Large-area Organic and Hybrid Solar Cells

Polymer Solar Cells for Solar Energy Conversion

Cite this