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Materials Design Considerations for Charge Generation in Organic Solar Cells

Stoichko Dimitrov Orcid Logo, James R. Durrant

Chemistry of Materials, Volume: 26, Issue: 1, Pages: 616 - 630

Swansea University Author: Stoichko Dimitrov Orcid Logo

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DOI (Published version): 10.1021/cm402403z

Abstract

This article reviews some of our recent progress on materials design guidelines for photoinduced charge generation in bulk-heterojunction organic solar cells. Over the last 7 years, our group has employed transient absorption measurement to determine the relative quantum yields of long-lived polaron...

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Published in: Chemistry of Materials
ISSN: 0897-4756 1520-5002
Published: 2014
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URI: https://cronfa.swan.ac.uk/Record/cronfa31799
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spelling 2017-02-21T12:49:22.8177101 v2 31799 2017-01-27 Materials Design Considerations for Charge Generation in Organic Solar Cells 9fc26ec1b8655cd0d66f7196a924fe14 0000-0002-1564-7080 Stoichko Dimitrov Stoichko Dimitrov true false 2017-01-27 EEN This article reviews some of our recent progress on materials design guidelines for photoinduced charge generation in bulk-heterojunction organic solar cells. Over the last 7 years, our group has employed transient absorption measurement to determine the relative quantum yields of long-lived polaron pairs for over 300 different organic Donor/Acceptor blend films. We have shown that this optical assay of charge separation can be a strong indicator of photocurrent generation efficiency in complete devices. In this review, we consider the lessons that can be drawn from these studies concerning the parameters that determine efficiency of this photoinduced charge separation in such solar cells. We consistently find, from studies of several materials series, that the energy offset driving charge separation is a key determinant of the efficiency of this charge generation, and thereby photocurrent generation. Moreover, we find that the magnitude of the energy offset required to drive charge separation, and the strength of this energetic dependence, varies substantially between materials classes. In particular, copolymers such as diketopyrrolopyrrole- and thiazolothiazole-based polymers are found to be capable of driving charge separation in blends with PCBM at much lower energy offsets than polythiophenes, such as P3HT, while replacement of PCBM with more crystalline perylene diimide acceptors is also observed to reduce the energy offset requirement for charge separation. We go on to discuss the role of film microstructure in also determining the efficiency of charge separation, including the role of mixed and pure domains, PCBM exciton diffusion limitations and the role of material crystallinity in modulating material energetics, thereby providing additional energy offsets that can stabilize the spatial separation of charges. Other factors considered include the role of Coulombically bound polaron pair or charge transfer states, device electric fields, charge carrier mobilities, triplet excitons, and photon energy. We discuss briefly a model for charge separation consistent with these and other observations. We conclude by summarizing the materials design guidelines for efficient charge photogeneration that can be drawn from these studies. Journal Article Chemistry of Materials 26 1 616 630 0897-4756 1520-5002 charge separation; charge transfer states; fullerene; photocurrent; polymer; transient absorption spectroscopy 14 1 2014 2014-01-14 10.1021/cm402403z http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&amp;SrcAuth=ORCID&amp;SrcApp=OrcidOrg&amp;DestLinkType=FullRecord&amp;DestApp=WOS_CPL&amp;KeyUT=WOS:000330416900051&amp;KeyUID=WOS:000330416900051 COLLEGE NANME Engineering COLLEGE CODE EEN Swansea University 2017-02-21T12:49:22.8177101 2017-01-27T13:46:04.0456448 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised Stoichko Dimitrov 0000-0002-1564-7080 1 James R. Durrant 2
title Materials Design Considerations for Charge Generation in Organic Solar Cells
spellingShingle Materials Design Considerations for Charge Generation in Organic Solar Cells
Stoichko Dimitrov
title_short Materials Design Considerations for Charge Generation in Organic Solar Cells
title_full Materials Design Considerations for Charge Generation in Organic Solar Cells
title_fullStr Materials Design Considerations for Charge Generation in Organic Solar Cells
title_full_unstemmed Materials Design Considerations for Charge Generation in Organic Solar Cells
title_sort Materials Design Considerations for Charge Generation in Organic Solar Cells
author_id_str_mv 9fc26ec1b8655cd0d66f7196a924fe14
author_id_fullname_str_mv 9fc26ec1b8655cd0d66f7196a924fe14_***_Stoichko Dimitrov
author Stoichko Dimitrov
author2 Stoichko Dimitrov
James R. Durrant
format Journal article
container_title Chemistry of Materials
container_volume 26
container_issue 1
container_start_page 616
publishDate 2014
institution Swansea University
issn 0897-4756
1520-5002
doi_str_mv 10.1021/cm402403z
college_str Faculty of Science and Engineering
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hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Uncategorised{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Uncategorised
url http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&amp;SrcAuth=ORCID&amp;SrcApp=OrcidOrg&amp;DestLinkType=FullRecord&amp;DestApp=WOS_CPL&amp;KeyUT=WOS:000330416900051&amp;KeyUID=WOS:000330416900051
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description This article reviews some of our recent progress on materials design guidelines for photoinduced charge generation in bulk-heterojunction organic solar cells. Over the last 7 years, our group has employed transient absorption measurement to determine the relative quantum yields of long-lived polaron pairs for over 300 different organic Donor/Acceptor blend films. We have shown that this optical assay of charge separation can be a strong indicator of photocurrent generation efficiency in complete devices. In this review, we consider the lessons that can be drawn from these studies concerning the parameters that determine efficiency of this photoinduced charge separation in such solar cells. We consistently find, from studies of several materials series, that the energy offset driving charge separation is a key determinant of the efficiency of this charge generation, and thereby photocurrent generation. Moreover, we find that the magnitude of the energy offset required to drive charge separation, and the strength of this energetic dependence, varies substantially between materials classes. In particular, copolymers such as diketopyrrolopyrrole- and thiazolothiazole-based polymers are found to be capable of driving charge separation in blends with PCBM at much lower energy offsets than polythiophenes, such as P3HT, while replacement of PCBM with more crystalline perylene diimide acceptors is also observed to reduce the energy offset requirement for charge separation. We go on to discuss the role of film microstructure in also determining the efficiency of charge separation, including the role of mixed and pure domains, PCBM exciton diffusion limitations and the role of material crystallinity in modulating material energetics, thereby providing additional energy offsets that can stabilize the spatial separation of charges. Other factors considered include the role of Coulombically bound polaron pair or charge transfer states, device electric fields, charge carrier mobilities, triplet excitons, and photon energy. We discuss briefly a model for charge separation consistent with these and other observations. We conclude by summarizing the materials design guidelines for efficient charge photogeneration that can be drawn from these studies.
published_date 2014-01-14T03:38:52Z
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score 11.035874

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