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.
Benzodithiophene based organic dyes for DSSC : effect of alkyl chain substitution on dye efficiency / C. Baldoli, S. Bertuolo, E. Licandro, L. Viglianti, P. Mussini, G. Marotta, P. Salvatori, F. De Angelis, P. Manca, N. Manfredi, A. Abbotto. - In: DYES AND PIGMENTS. - ISSN 0143-7208. - 121(2015), pp. 351-362.
|Titolo:||Benzodithiophene based organic dyes for DSSC : effect of alkyl chain substitution on dye efficiency|
|Parole Chiave:||Benzodithiophene; Cyclic voltammetry; DFT-TDDFT; Dye sensitized solar cells; Push-pull dyes; Solvent effects; Chemical Engineering (all); Process Chemistry and Technology|
|Settore Scientifico Disciplinare:||Settore CHIM/06 - Chimica Organica|
|Data di pubblicazione:||2015|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1016/j.dyepig.2015.04.028|
|Appare nelle tipologie:||01 - Articolo su periodico|