The dye based on triphenylamine and 2-ethynyl-6-methylthieno[3,2-b]thiophene exhibited a
power conversion efficiency (PCE) of 4.53% under simulated air mass 1.5 global sunlight. These results
indicate that the introduction of 2-ethynyl-6-methylthieno[3,2-b]thiophene in the meso-positions of
porphyrin dyes is an effective approach to improve the photovoltaic performance.