Journal
DYES AND PIGMENTS
Volume 121, Issue -, Pages 351-362Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2015.04.028
Keywords
Push-pull dyes; Dye sensitized solar cells; Benzodithiophene; DFT-TDDFT; Cyclic voltammetry; Solvent effects
Funding
- Universita degli Studi di Milano
- National Research Council (CNR) [CNRPMP04.012]
- Accordo Quadro Regione Lombardia-CNR (Times Project)
- Ministero dell'Universita e della Ricerca (MIUR-PRIN) [2008CSNZFR]
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A series of push pull triarylamine organic dyes containing the benzo[1,2-b:4,5-b']dithiophene unit as a spacer and bearing alkyl chains in different positions of the molecule were synthesized. The new dyes 1 4 were characterized by optical and electrochemical measurements and density functional theory calculations and used as sensitizers in liquid dye-sensitized solar cells. The effect of alkyl chain position on dye properties and performances was investigated and dye 1, bearing two 3,7-dimethyloctyl groups on the benzodithiophene core, exhibited the best behaviour in term of light absorption and cell performance (PCE of 6.6%, to be compared with a PCE of 8.1% for N719-based device). The efficiency of the DSSC was highly dependent on the solvent used for the dye-sensitizing bath, which affects the position of the COOH/COO- equilibrium. (C) 2015 Elsevier Ltd. All rights reserved.
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