Abstract The development of a new counter electrode structure for monolithic dye-sensitized solar cells (DSCs) is reported. A conducting polymer, PEDOT, is selectively electrodeposited throughout the carbon layer of the counter electrode, as confirmed by SEM. The formation of this composite allows reduced electrical resistivity, thus improving the fill factor and efficiency of devices. The improved mechanical stability of the carbon/conducting polymer composite layers makes these more suitable for use with flexible substrates, which is advantageous for the development of monolithic DSCs on plastic substrates that can be produced using roll-to-roll processes.