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Singlet Exciton Lifetimes in Conjugated Polymer Films for Organic Solar Cells

Stoichko Dimitrov Orcid Logo, Bob C. Schroeder, Christian B. Nielsen, Hugo Bronstein, Zhuping Fei, Iain McCulloch, Martin Heeney, James R. Durrant

Polymers, Volume: 8, Issue: 1, Start page: 14

Swansea University Author: Stoichko Dimitrov Orcid Logo

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DOI (Published version): 10.3390/polym8010014

Abstract

The lifetime of singlet excitons in conjugated polymer films is a key factor taken into account during organic solar cell device optimization. It determines the singlet exciton diffusion lengths in polymer films and has a direct impact on the photocurrent generation by organic solar cell devices. Ho...

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Published in: Polymers
ISSN: 2073-4360
Published: 2016
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URI: https://cronfa.swan.ac.uk/Record/cronfa31794
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spelling 2017-02-01T14:18:15.8541654 v2 31794 2017-01-27 Singlet Exciton Lifetimes in Conjugated Polymer Films for Organic Solar Cells 9fc26ec1b8655cd0d66f7196a924fe14 0000-0002-1564-7080 Stoichko Dimitrov Stoichko Dimitrov true false 2017-01-27 EEN The lifetime of singlet excitons in conjugated polymer films is a key factor taken into account during organic solar cell device optimization. It determines the singlet exciton diffusion lengths in polymer films and has a direct impact on the photocurrent generation by organic solar cell devices. However, very little is known about the material properties controlling the lifetimes of singlet excitons, with most of our knowledge originating from studies of small organic molecules. Herein, we provide a brief summary of the nature of the excited states in conjugated polymer films and then present an analysis of the singlet exciton lifetimes of 16 semiconducting polymers. The exciton lifetimes of seven of the studied polymers were measured using ultrafast transient absorption spectroscopy and compared to the lifetimes of seven of the most common photoactive polymers found in the literature. A plot of the logarithm of the rate of exciton decay vs. the polymer optical bandgap reveals a medium correlation between lifetime and bandgap, thus suggesting that the Energy Gap Law may be valid for these systems. This therefore suggests that small bandgap polymers can suffer from short exciton lifetimes, which may limit their performance in organic solar cell devices. In addition, the impact of film crystallinity on the exciton lifetime was assessed for a small bandgap diketopyrrolopyrrole co-polymer. It is observed that the increase of polymer film crystallinity leads to reduction in exciton lifetime and optical bandgap again in agreement with the Energy Gap Law. Journal Article Polymers 8 1 14 2073-4360 excited states; diffusion; energy gap law; non-radiative; ultrafast transient absorption spectroscopy 13 1 2016 2016-01-13 10.3390/polym8010014 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:000369492900013&amp;KeyUID=WOS:000369492900013 COLLEGE NANME Engineering COLLEGE CODE EEN Swansea University 2017-02-01T14:18:15.8541654 2017-01-27T13:45:48.4453622 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised Stoichko Dimitrov 0000-0002-1564-7080 1 Bob C. Schroeder 2 Christian B. Nielsen 3 Hugo Bronstein 4 Zhuping Fei 5 Iain McCulloch 6 Martin Heeney 7 James R. Durrant 8 0031794-01022017141806.pdf dimitrov2017.pdf 2017-02-01T14:18:06.3530000 Output 801400 application/pdf Version of Record true 2017-02-01T00:00:00.0000000 false
title Singlet Exciton Lifetimes in Conjugated Polymer Films for Organic Solar Cells
spellingShingle Singlet Exciton Lifetimes in Conjugated Polymer Films for Organic Solar Cells
Stoichko Dimitrov
title_short Singlet Exciton Lifetimes in Conjugated Polymer Films for Organic Solar Cells
title_full Singlet Exciton Lifetimes in Conjugated Polymer Films for Organic Solar Cells
title_fullStr Singlet Exciton Lifetimes in Conjugated Polymer Films for Organic Solar Cells
title_full_unstemmed Singlet Exciton Lifetimes in Conjugated Polymer Films for Organic Solar Cells
title_sort Singlet Exciton Lifetimes in Conjugated Polymer Films for Organic Solar Cells
author_id_str_mv 9fc26ec1b8655cd0d66f7196a924fe14
author_id_fullname_str_mv 9fc26ec1b8655cd0d66f7196a924fe14_***_Stoichko Dimitrov
author Stoichko Dimitrov
author2 Stoichko Dimitrov
Bob C. Schroeder
Christian B. Nielsen
Hugo Bronstein
Zhuping Fei
Iain McCulloch
Martin Heeney
James R. Durrant
format Journal article
container_title Polymers
container_volume 8
container_issue 1
container_start_page 14
publishDate 2016
institution Swansea University
issn 2073-4360
doi_str_mv 10.3390/polym8010014
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:000369492900013&amp;KeyUID=WOS:000369492900013
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description The lifetime of singlet excitons in conjugated polymer films is a key factor taken into account during organic solar cell device optimization. It determines the singlet exciton diffusion lengths in polymer films and has a direct impact on the photocurrent generation by organic solar cell devices. However, very little is known about the material properties controlling the lifetimes of singlet excitons, with most of our knowledge originating from studies of small organic molecules. Herein, we provide a brief summary of the nature of the excited states in conjugated polymer films and then present an analysis of the singlet exciton lifetimes of 16 semiconducting polymers. The exciton lifetimes of seven of the studied polymers were measured using ultrafast transient absorption spectroscopy and compared to the lifetimes of seven of the most common photoactive polymers found in the literature. A plot of the logarithm of the rate of exciton decay vs. the polymer optical bandgap reveals a medium correlation between lifetime and bandgap, thus suggesting that the Energy Gap Law may be valid for these systems. This therefore suggests that small bandgap polymers can suffer from short exciton lifetimes, which may limit their performance in organic solar cell devices. In addition, the impact of film crystallinity on the exciton lifetime was assessed for a small bandgap diketopyrrolopyrrole co-polymer. It is observed that the increase of polymer film crystallinity leads to reduction in exciton lifetime and optical bandgap again in agreement with the Energy Gap Law.
published_date 2016-01-13T03:38:51Z
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