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Journal Article

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

MPS-Authors
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Schwoerer,  H.
Physics Department, Laser Research Institute, Stellenbosch University;
Miller Group, Atomically Resolved Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

External Resource

https://dx.doi.org/10.1002/polb.24743
(Publisher version)

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Supplementary Material (public)

polb24743-sup-0001-figures.pdf
(Supplementary material), 429KB

Citation

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.


Cite as: https://hdl.handle.net/21.11116/0000-0002-5785-6
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.