a) fluorine is the mostelectronegative element, with a Pauling electronegativity of4.0, which is much larger than that of hydrogen (2.2);b) fluorine is the smallest electron-withdrawing group (vander Waals radius, r=1.35 , only slightly larger than hydro-gen, r=1.2 ). Furthermore, these fluorine atoms often havea great influence on inter- and intramolecular interactionsthrough C-F···H, F···S, and C-F···p

Fluorinated benzothiadiazole shows potential as a structural unit for a polymer solar cell with 7 % efficiency, demonstrating its potential as a structural unit for efficient solar cell performance.

Paper

Development of fluorinated benzothiadiazole as a structural unit for a polymer solar cell of 7 % efficiency.

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