Two new porphyrins that incorporate thiophene substituents as spacers between the conjugated
porphyrin core and the anchoring cyanoacrylate group have been synthesised. The two dyes differ in the
number of thiophene bridges; porphyrin 1a has only one thiophene group and porphyrin 1b has two
thiophene rings connected by a double bond. The measured light-to-energy conversion efficiencies in 1a
and 1b were assessed using two different electrolytes, LP1 and LP2, which differ in the presence of tertbutyl
pyridine in LP1. An efficiency of 6% under standard measurement conditions has been achieved for
1a þ LP1. However, for porphyrin 1b the use of electrolyte LP1 led to lower efficiencies and a value of
approximately 4% was obtained. The differences between the two types of solar cells and the electrolytes
have been studied in-depth using photo-induced time-resolved techniques such as CE (Charge Extraction)
and TPV (Transient PhotoVoltage).