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Spatially Resolving Ordered and Disordered Conformers and Photocurrent Generation in Intercalated Conjugated Polymer/Fullerene Blend Solar Cells
[Image: see text] Resonance Raman spectroscopy was used to identify ordered and disordered conformers of poly(2,5-bis(3-tetradecylthiophen-2-yl)thieno[3,2-b]thiophene) (PBTTT) blended with the electron acceptor [6,6]-phenyl C(61) butyric acid methyl ester (PCBM) in bulk heterojunction (BHJ) solar ce...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Chemical
Society
2014
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4311932/ https://www.ncbi.nlm.nih.gov/pubmed/25678742 http://dx.doi.org/10.1021/cm501252y |
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author | Gao, Jian Thomas, Alan K. Johnson, Ryan Guo, Hua Grey, John K. |
author_facet | Gao, Jian Thomas, Alan K. Johnson, Ryan Guo, Hua Grey, John K. |
author_sort | Gao, Jian |
collection | PubMed |
description | [Image: see text] Resonance Raman spectroscopy was used to identify ordered and disordered conformers of poly(2,5-bis(3-tetradecylthiophen-2-yl)thieno[3,2-b]thiophene) (PBTTT) blended with the electron acceptor [6,6]-phenyl C(61) butyric acid methyl ester (PCBM) in bulk heterojunction (BHJ) solar cells where PCBM intercalates into PBTTT side groups. We show that the PBTTT thiophene ring symmetric C=C stretching mode consists of contributions from ordered (ℏω(C=C) = 1489 cm(–1), fwhm ∼ 15 cm(–1)) and disordered (ℏω(C=C) = 1500 cm(–1), fwhm ∼ 25 cm(–1)) components and their relative amounts are sensitive to PCBM loading, annealing and excitation energy. The 1500 cm(–1) PBTTT component originates from twisted thiophene rings and disordered side groups due to PCBM intercalation in a mixed kinetic phase and thermal annealing promotes ordering of PBTTT chains from the formation of bimolecular PBTTT/PCBM crystals. Density functional theory (DFT) Raman simulations of PBTTT monomers support these assignments. Resonance Raman images of annealed PBTTT/PCBM model solar cells confirm that ordered PBTTT chains are most concentrated in PCBM-rich bimolecular crystals and corresponding intensity modulated photocurrent spectroscopy (IMPS) and imaging measurements show increased nongeminate charge recombination at the boundaries of ordered/disordered regions. |
format | Online Article Text |
id | pubmed-4311932 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2014 |
publisher | American Chemical
Society |
record_format | MEDLINE/PubMed |
spelling | pubmed-43119322015-07-18 Spatially Resolving Ordered and Disordered Conformers and Photocurrent Generation in Intercalated Conjugated Polymer/Fullerene Blend Solar Cells Gao, Jian Thomas, Alan K. Johnson, Ryan Guo, Hua Grey, John K. Chem Mater [Image: see text] Resonance Raman spectroscopy was used to identify ordered and disordered conformers of poly(2,5-bis(3-tetradecylthiophen-2-yl)thieno[3,2-b]thiophene) (PBTTT) blended with the electron acceptor [6,6]-phenyl C(61) butyric acid methyl ester (PCBM) in bulk heterojunction (BHJ) solar cells where PCBM intercalates into PBTTT side groups. We show that the PBTTT thiophene ring symmetric C=C stretching mode consists of contributions from ordered (ℏω(C=C) = 1489 cm(–1), fwhm ∼ 15 cm(–1)) and disordered (ℏω(C=C) = 1500 cm(–1), fwhm ∼ 25 cm(–1)) components and their relative amounts are sensitive to PCBM loading, annealing and excitation energy. The 1500 cm(–1) PBTTT component originates from twisted thiophene rings and disordered side groups due to PCBM intercalation in a mixed kinetic phase and thermal annealing promotes ordering of PBTTT chains from the formation of bimolecular PBTTT/PCBM crystals. Density functional theory (DFT) Raman simulations of PBTTT monomers support these assignments. Resonance Raman images of annealed PBTTT/PCBM model solar cells confirm that ordered PBTTT chains are most concentrated in PCBM-rich bimolecular crystals and corresponding intensity modulated photocurrent spectroscopy (IMPS) and imaging measurements show increased nongeminate charge recombination at the boundaries of ordered/disordered regions. American Chemical Society 2014-07-18 2014-08-12 /pmc/articles/PMC4311932/ /pubmed/25678742 http://dx.doi.org/10.1021/cm501252y Text en Copyright © 2014 American Chemical Society Terms of Use (http://pubs.acs.org/page/policy/authorchoice_termsofuse.html) |
spellingShingle | Gao, Jian Thomas, Alan K. Johnson, Ryan Guo, Hua Grey, John K. Spatially Resolving Ordered and Disordered Conformers and Photocurrent Generation in Intercalated Conjugated Polymer/Fullerene Blend Solar Cells |
title | Spatially Resolving Ordered and Disordered Conformers
and Photocurrent Generation in Intercalated Conjugated Polymer/Fullerene
Blend Solar Cells |
title_full | Spatially Resolving Ordered and Disordered Conformers
and Photocurrent Generation in Intercalated Conjugated Polymer/Fullerene
Blend Solar Cells |
title_fullStr | Spatially Resolving Ordered and Disordered Conformers
and Photocurrent Generation in Intercalated Conjugated Polymer/Fullerene
Blend Solar Cells |
title_full_unstemmed | Spatially Resolving Ordered and Disordered Conformers
and Photocurrent Generation in Intercalated Conjugated Polymer/Fullerene
Blend Solar Cells |
title_short | Spatially Resolving Ordered and Disordered Conformers
and Photocurrent Generation in Intercalated Conjugated Polymer/Fullerene
Blend Solar Cells |
title_sort | spatially resolving ordered and disordered conformers
and photocurrent generation in intercalated conjugated polymer/fullerene
blend solar cells |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4311932/ https://www.ncbi.nlm.nih.gov/pubmed/25678742 http://dx.doi.org/10.1021/cm501252y |
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