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In this work, we study the light absorption properties of a novel molecule(BTTzR) and its more extended derivatives, which hold promise as electron-donormaterial in organic solar cells. By employing density functional theory, weobserve that the addition of two and three oligothiophene chains to the centralbenzene ring of the benzo[1,2-b:4,5-b']dithiophene (BDT-T) leads to both ared-shift of the existing peaks and, interestingly, to the development of newblue-shifted features, an effect that can certainly increase thepanchromaticity of the molecule in the visible spectral range.

Calculated optical properties of BTTzR donor molecule and its derivatives