These authors contributed equally to this work.
Organic Sensitizers Featuring a Planar Indeno[1,2-b]-thiophene for Efficient Dye-Sensitized Solar Cells
Article first published online: 20 JUN 2013
Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Volume 6, Issue 8, pages 1425–1431, August 2013
How to Cite
Lim, K., Ju, M. J., Song, J., Choi, I. T., Do, K., Choi, H., Song, K., Kim, H. K. and Ko, J. (2013), Organic Sensitizers Featuring a Planar Indeno[1,2-b]-thiophene for Efficient Dye-Sensitized Solar Cells. ChemSusChem, 6: 1425–1431. doi: 10.1002/cssc.201300281
- Issue published online: 14 AUG 2013
- Article first published online: 20 JUN 2013
- Manuscript Received: 30 MAR 2013
- Ministry of Education, Science, and Technology (MEST) through the National Research Foundation of Korea. Grant Number: R31-2012-000-10035-0
- Engineering Research Council (ERC) MEST program. Grant Number: 2012-0000591
- Converging Research Center Program. Grant Number: 2012K001287
- International Science and Business Belt Program. Grant Number: 2012K001573
- solar cells
An efficient organic sensitizer (JK-306) featuring a planar indeno[1,2-b]thiophene as the π-linker of a bridging unit for dye-sensitized solar cells (DSSCs) was synthesized. The sensitizer had a strong molar absorption coefficient and a red-shifted absorption band compared with JK-305, which resulted in a significant increase in the short-circuit photocurrent density. We incorporated a highly congested bulky amino group into the 2′,4′-dihexyloxybiphenyl-4-yl moiety, an electron donor, to diminish the charge recombination and to prevent aggregation of the sensitizer. Under standard AM 1.5G solar conditions, JK-306-sensitized cells in the presence of co-adsorbents chenodeoxycholic acid (CDCA) and 4-[bis(9,9-dimethyl-9H-fluoren-2-yl)amino]benzoic acid (HC-A), which afforded an overall conversion efficiency of 8.37 % and 8.52 %, respectively. Upon changing the I−/I3− electrolyte to the CoII/CoIII redox couple, the cell gave rise to a significantly improved conversion efficiency of 10.02 % with the multifunctional HC-A, which is one of the highest values reported for DSSCs with a cobalt-based electrolyte. Furthermore, the JK-306-based solar cell with a polymer gel electrolyte revealed a high conversion efficiency of 7.61 %, which is one of the highest values for cells based on organic sensitizers.