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  Ultrafast excited state dynamics of a bithiophene‐isoindigo copolymer obtained by direct arylation polycondensation and its application in indium tin oxide‐free solar cells

Tegegne, N. A., Abdissa, Z., Mammo, W., Andersson, M. R., Schlettwein, D., & Schwoerer, H. (2018). Ultrafast excited state dynamics of a bithiophene‐isoindigo copolymer obtained by direct arylation polycondensation and its application in indium tin oxide‐free solar cells. Journal of Polymer Science Part B-Polymer Physics, 56(21), 1475-1483. doi:10.1002/polb.24743.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0002-5785-6 Version Permalink: http://hdl.handle.net/21.11116/0000-0002-92DD-0
Genre: Journal Article

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Tegegne_et_al-2018-Journal_of_Polymer_Science_Part_B%3A_Polymer_Physics.pdf (Publisher version), 2MB
 
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https://dx.doi.org/10.1002/polb.24743 (Publisher version)
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 Creators:
Tegegne, N. A.1, Author
Abdissa, Z.2, Author
Mammo, W.2, Author
Andersson, M. R.3, Author
Schlettwein, D.4, Author
Schwoerer, H.1, 5, Author              
Affiliations:
1Physics Department, Laser Research Institute, Stellenbosch University, ou_persistent22              
2Science Faculty, Department of Chemistry, Addis Ababa University, ou_persistent22              
3Future Industries Institute, University of South Australia, ou_persistent22              
4Institute of Applied Physics, Justus-Liebig-University, ou_persistent22              
5Miller Group, Atomically Resolved Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_1938288              

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Free keywords: charge transfer, copolymer, photophysics, UV-vis spectroscopy
 Abstract: A low band gap copolymer, P2TI (Eg = 1.6.eV), with bithiophene as donor and isoindigo as acceptor units is designed and synthesized by the direct arylation polycondensation (DAP) method. Absorbance of the polymer spans from 300 to 780 nm. It exhibits an absorption coefficient (ε) of 96 L/g cm in solution at its maxima. A HOMO level of −5.42 eV and LUMO level of −3.72 eV is measured by square wave voltammetry. ITO‐free solar cells fabricated using a P2TI:PCBM71 bulk heterojunction shows a moderate efficiency of 1.02% with a high open circuit voltage of 0.81 V. An intramolecular charge transfer state is found in the relaxation of P2TI in solution, which is generated with a time constant of 2 ps as measured by femtosecond‐transient absorption spectroscopy. Charge carriers were generated in <250 fs in P2TI:PCBM71 films.

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Language(s): eng - English
 Dates: 2018-05-032018-08-232018-10-082018-11-01
 Publication Status: Published in print
 Pages: 9
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1002/polb.24743
 Degree: -

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Title: Journal of Polymer Science Part B-Polymer Physics
Source Genre: Journal
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Publ. Info: New York, N.Y. : Wiley
Pages: 9 Volume / Issue: 56 (21) Sequence Number: - Start / End Page: 1475 - 1483 Identifier: ISSN: 0887-6266
CoNE: https://pure.mpg.de/cone/journals/resource/954928591990_1