Journal article

Publication year: 2018

Pages: 1475-1483

Journal: Journal of Polymer Science Part B: Polymer Physics

Volume number: 56

Issue number: 21

ISSN: 0887-6266

eISSN: 1099-0488

DOI Link: https://doi.org/10.1002/polb.24743

Publisher: Wiley

Abstract: 
A low band gap copolymer, P2TI (E-g = 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 (epsilon) 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 P2TI:PCBM71 films. (c) 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2018, 56, 1475-1483

Harvard Citation style: Tegegne, N., Abdissa, Z., Mammo, W., Andersson, M., Schlettwein, D. and 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), pp. 1475-1483. https://doi.org/10.1002/polb.24743

APA Citation style: Tegegne, N., Abdissa, Z., Mammo, W., Andersson, M., 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. https://doi.org/10.1002/polb.24743