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  Effect of Alkyl Side Chain Length on Intra- and Intermolecular Interactions of Terthiophene–Isoindigo Copolymers

Tegegne, N. A., Abdissa, Z., Mammo, W., Uchiyama, T., Okada-Shudo, Y., Galeotti, F., et al. (2020). Effect of Alkyl Side Chain Length on Intra- and Intermolecular Interactions of Terthiophene–Isoindigo Copolymers. Journal of Physical Chemistry C, 124(18), 9644-9655. doi:10.1021/acs.jpcc.9b11072.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-7CDF-5 Version Permalink: http://hdl.handle.net/21.11116/0000-0006-7CE0-2
Genre: Journal Article

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https://dx.doi.org/10.1021/acs.jpcc.9b11072 (Publisher version)
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 Creators:
Tegegne, N. A.1, 2, Author
Abdissa, Z.3, Author
Mammo, W.3, Author
Uchiyama, T.4, Author
Okada-Shudo, Y.4, Author
Galeotti, F.5, Author
Porzio, W.5, Author
Andersson, M. R.6, Author
Schlettwein, D.7, Author
Vohra, V.4, Author
Schwoerer, H.8, Author              
Affiliations:
1Department of Physics, Addis Ababa University, ou_persistent22              
2Laser Research Institute, Physics Department, Stellenbosch University, ou_persistent22              
3Department of Chemistry, Science Faculty, Addis Ababa University, ou_persistent22              
4Department of Engineering Science, University of Electro-Communications, ou_persistent22              
5Istituto di Scienze e Tecnologie Chimiche “G. Natta”-Consiglio Nazionale delle Ricerche (SCITEC-CNR) - CNR), ou_persistent22              
6Future Industries Institute, University of South Australia, ou_persistent22              
7Institut fur Angewandte Physik , Justus-Liebig-University, ou_persistent22              
8Miller Group, Atomically Resolved Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_1938288              

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 Abstract: Two terthiophene–isoindigo copolymers (P3TI-O and P3TI-D) were successfully designed and synthesized. Octyl (O) and dodecyl (D) alkyl side chains were appended at the third position of the first and fourth positions of the last thiophene on the terthiophene donor units in P3TI-O and P3TI-D, respectively. The band gaps of these copolymers were less than 1.7 eV. We found intramolecular charge-transfer states in both copolymers, which were generated with time constants of 4.5 and 13 ps for the copolymers with short and long alkyl side chains on their donor units, respectively. These results indicate that an almost 3-fold faster intramolecular charge-transfer process occurs when the alkyl side chains are shortened by four methyl units. Owing to a better interchain charge transfer, P3TI-O exhibits a more efficient exciton diffusion compared to P3TI-D, thus leading to longer exciton lifetimes in the copolymer with shorter alkyl side chains. Consequently, when blended with PC71BM in bulk heterojunctions, P3TI-O showed a better exciton dissociation efficiency compared to P3TI-D. These results correlate well with the higher short-circuit current densities observed in P3TI-O:PC71BM inverted architecture organic solar cells compared to the P3TI-D:PC71BM ones.

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Language(s): eng - English
 Dates: 2020-04-092019-11-272020-04-142020-05-07
 Publication Status: Published in print
 Pages: 12
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1021/acs.jpcc.9b11072
 Degree: -

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Title: Journal of Physical Chemistry C
  Abbreviation : J. Phys. Chem. C
Source Genre: Journal
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Publ. Info: Washington DC : American Chemical Society
Pages: 12 Volume / Issue: 124 (18) Sequence Number: - Start / End Page: 9644 - 9655 Identifier: ISSN: 1932-7447
CoNE: https://pure.mpg.de/cone/journals/resource/954926947766_2