The photoconductivity properties of HDPPBA-C, HDPPBA-N and the control molecule were measured by flash photolysis-time resolved microwave conductivity (FP-TRMC) upon irradiation with a 355 nm pulsed laser. FP-TRMC is a contactless technique that affords a measure of photoconductivity as ΦΣμ where Φ is the charge carrier generation quantum yield and Σμ is the sum of charge carrier mobilities (electrons and holes). Thin films of the compounds were prepared by drop casting from chloroform/toluene solutions, and their photoconductivity was directly analysed. The kinetic traces of conductivity transients can be seen in figure . Despite the differences found in aggregation, the photoconductivity values of HDPPBA-C and HDPPBA-N are very similar, being of 2.0 x 10 -5 cm -2 V - 1 s -1 and 1.6 x 10 -5 cm -2 V -1 s -1 respectively (Table , entries 1 and 2) when measuring up to 10 s.