Abstract
AbstractIn dye‐sensitized solar cells (DSSC), controlling the dye‐aggregation on the metal‐oxide surface by appending the alkyl groups around the donor or π‐spacer unit of the dye is a potential approach to enhance DSSC efficiency. Further, rigidification of the dye structures by cyclization modulates the photophysical properties of the sensitizer. Here a series of donor‐acceptor‐donor (D‐A‐D) type far‐red active unsymmetrical squaraine dyes (SQA) have been designed and synthesized, where N,N‐dimethylaniline, methylated‐ and branched‐indoline have been used as donor units. These dyes showed absorption between 629–654 nm (λmax) with the molar extinction coefficient of 1.49–1.94×105 M−1 cm−1. Systematic enhancements in DSSC device efficiency have been observed due to the cyclization and alkyl‐groups incorporation in this set of dyes which were further enhanced with the addition of chenodeoxycholic acid (CDCA). The highest DSSC device efficiency of 4.78 % (Jsc of 8.77 mA/cm2 and Voc of 692 mV) has been achieved for SQA3. The IPCE profile of SQA dyes indicates the contribution of aggregated structures for the photocurrent generation. Further, co‐sensitization of SQA3 dye with a complementary visible light active dye AK4 showed the enhanced device efficiency of 6.27 % with panchromatic IPCE response.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.