Journal
DYES AND PIGMENTS
Volume 148, Issue -, Pages 61-71Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2017.07.063
Keywords
DSSC; Metal-free sensitizer; N,N-alkylaniline; Thiophene; Benzothiadiazole; Alkylsilyl group
Funding
- Spanish Ministry of Science and Innovation-MICINN-FEDER [CTQ 2014-52331-R]
- Gobierno de Aragon-Fondo Social Europeo
- ICMA-Pi2 program
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We have developed four new dyes for DSSCs with a tert-butyldimethylsilylether in order to test their physical and photovoltaic properties. These dyes consist of a novel donor based on a functionalized N,N-dialkylaniline, a heteroaromatic pi-conjugated spacer, such as thiophene or benzothiadiazole ring, and cyanoacetic acid as acceptor group. DFT theoretical studies predict, on the one hand, higher molar extinction coefficient for dyes with thiophene spacers than for those with benzothiadiazole groups while, on the other hand, the use of benzothiadiazole ring would give rise to the reduction of the back electron transfer (BET). The experimental studies have confirmed the predicted higher absorption of thiophene dyes and the better photovoltaic performance of the DSSCs prepared with these dyes. Finally, the stability of the response would support further studies of dyes with anilines functionalized with a tertbutyldimethylsilyl group to perform long-term devices. (C) 2017 Elsevier Ltd. All rights reserved.
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