In this article, we report the facile synthesis of metal-free dyes 6 and 7, their solution-based optical and redox properties and their use as sensitizers in dye-sensitized solar cells (DSSCs). Our studies indicate that the addition of the second thiophene unit in dye 7, decreases the oxidation and reduction potential and consequently the band gap of the molecule compared to 6. Furthermore, increasing the length of the conjugated spacer also affects on the properties of the DSSCs, with dye 7 providing a higher power conversion efficiency compared to 6 (η = 4.49 versus 3.23%).
Bibliographical noteFunding Information:
MA-E thanks the Ministry of Higher Education (Saudi Arabia) for a scholarship. BF and GC thank the EPSRC. JH acknowledges Basic Science Research Program (2013-026989) and Mid-career Research Program (2012-047815) through the National Research Foundation (NRF) funded by the Ministry of Science, ICT & Future Planning (MSIP) of Korea . KW acknowledges the Chung-Ang University Excellent Student Scholarship. KK thanks for the support from Basic Science Research Program through the NRF funded by the MSIP of Korea ( 2009-0093817 ).
- Dye-sensitized solar cells
- Organic dye
ASJC Scopus subject areas
- Chemical Engineering(all)
- Process Chemistry and Technology