New N-methyl pyrrole and thiophene based D–π–A systems for dye-sensitized solar cells
By Kim, Bo Hyung & Freeman, Harold S.
Published in Dyes and Pigments
2013
Abstract
Dye-sensitized solar cells (DSSCs) containing novel DP-T and DP-P organic sensitizers having thiophene and N-methyl pyrrole moieties as Ï€ bridges in a D–Ï€–A system were assembled and characterized. Incorporation of a thiophene bridge to give sensitizer DP-T enhanced solar energy capture, while impedance spectroscopy showed a much longer electron recombination lifetime (Ï„) for the DSSCs based on pyrrole containing sensitizer DP-P. The observed kinetics led to increased open circuit voltage (Voc) for the device based on DP-P, regardless of types of additives (TBP or DCA) employed in the devices. Better photovoltaic performance was achieved using DP-T.